| Advanced Archival Memory. |
MAR 1979 |
|
| Authors:
M. S. Adler; P. V. Gray; C. G. Kirkpatrick; H. G. Parks; G. E. Possin; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
 | This report covers the effort for the first eight months of 1978. The contract has been redirected from the ion damage writing concept to one based on electron beam milling of thin layers of selenium-arsenic on silicon diode detectors. Background surrounding the redirection can be found in the introduction. Work in the reporting period has concentrated on evaluating two all-electron beam storage concepts (alloy junction and electron beam milling). The ... |
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| Dynamic Effects of Avalanche-Generated Carriers. |
MAR 1979 |
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| Authors:
S. P. Yu; W. Tantraporn ; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Dynamic effects of avalanche-generated carriers in transistors were investigated using a two-dimensional, time-domain computer program. Basic properties of MESFET logic devices were also studied. The primary effect of avalanche process on bipolar transistor was found to be the majority carrier current in the lateral direction of the base creating a voltage drop opposite to the more usual edge-crowding effect. Avalanche multiplication in the stationary high field domain of a GaAs ... |
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| Solid State Materials Derived from Planar Metal Complexes. |
DEC 1978 |
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| Authors:
L. V. Interrante; John S. Kasper; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| This report describes work carried out over the period 1 July 1975 to 31 Oct. 1978 on the contract 'Solid State Materials Derived from Planar Metal Complexes'. The principal focus of this work has been on the preparation and study of pi-donor-acceptor compounds derived from the interaction of the organic donors, tetrathiafulvalene and tetrathiotetracene, with bis(1,2-ethylenedithiolene) metal complexes as the pi-acceptors. These new compounds have been studied using electrical conductivity, ... |
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| Origin of Magnetic Properties in Amorphous Metals. |
NOV 1978 |
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| Authors:
F. E. Luborsky; J. J. Becker; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| The magnetic properties of amorphous metals are examined relative to changes in composition, processing, and heat treatment of amorphous transition metal-metalloid alloys. The transition metals examined were iron and iron plus nickel. These were alloyed with the metalloids boron, phosphorous, and carbon. Significant effects of alloy variation were observed on magnetic properties and on the crystallization and stress relief of these materials. Magnetic ageing was also observed and is interpreted ... |
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| Study of Noise in CID Array Systems. |
NOV 1978 |
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| Authors:
G. J. Michon; H. K. Burke; T. L. Vogelsong; K. Wang; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| A detailed description of CID image sensing and the various readout techniques is given. The results of theoretical and experimental studies of temporal and fixed pattern noise that affects CID imager performance are presented. The effects of feedback on amplifier noise charge are derived. A short study on the low frequency noise of buried channel MOSFETs has also been performed. The use of multiple non-destructive readout operations and off-chip signal ... |
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| Analysis and Calculations of Lightning Interactions with Aircraft Electrical Circuits. |
AUG 1978 |
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| Authors:
F. A. Fisher; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| This report documents the results of a study performed to evaluate the indirect effects of lightning strikes - specifically, induced voltages - on the electrical systems of aircraft. Numerical methods for evaluating the fields produced by lightning currents flowing the skin of the aircraft are presented as a first analytical step. Additional numerical methods, for computing the voltages induced in wiring systems by the fields evaluated in the first step, ... |
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| Advanced Archival Memory. |
JUL 1978 |
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| Authors:
C. G. Kirkpatrick; H. G. Parks; G. E. Possin; R. C. Raymond; K. G. Vosburgh; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| During this six-month period, work on the Advanced Archival Memory System has been concentrated on an ion-implantation based storage concept. Beam and target systems have been developed in parallel. Also, alternative data storage approaches have continued to be explored, and overall systems applications have been studied to provide guidance regarding the important technical parameters. The high current ion writing station appears feasible, and detailed design and construction were begun. However, ... |
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| Development of a Sintering Process for High-Performance Silicon Nitride. |
JUL 1978 |
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| Authors:
S. Prochazka; C. D. Greskovich; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Beta-Si3N4 ceramics with excellent creep and oxidation resistance in the temperature range of 1300 to 1450 C can be produced by the sintering process using small amounts (3-7%) of BeSiN2 as a densification aid. These ceramics are composed of both elongated and equi-axed grains of Beta-Si3N4 solid solution and sometimes contain minor amounts of Si, SiC and BeSiN2, depending on starting composition and sintering conditions. Although samples have been occasionally ... |
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| Silicon Nitride for Airborne Turbine Applications. |
JUL 1978 |
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| Authors:
John A. Palm; Charles D. Greskovich; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Procedures are described for processing a commercially available alpha-Si3N4 power which allow it to be hot-pressed to theoretical density when small additions of BeSiN2 are added to the processed powder. Studies of the macro- and microstructural character of the hot pressed ceramic were conducted. The results of that study emphasized the need for thorough and homogeneous blending of the Si3N4 powder prepared and made ready for hot pressing. Investigations were ... |
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| Interface Doping of MNOS Transistors. |
JUN 1978 |
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| Authors:
C. A. Neugebauer; M. M. Barnicle; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| The objective of this program is threefold: First to survey interface dopants suitable for use in MNOS nonvolatile storage transistors, to identify optimum dopant materials, concentrations, and deposition techniques, and to evaluate the write characteristics, retention, and endurance of interface doped MNOS devices by accelerated test methods. Second, to investigate the feasibility of fabricating n-channel interface doped MNOS transistors, both memory and stable gate and assess device yields. Third, to ... |
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| Transport Properties of Metal Oxides in the Presence of Sulfur. |
JUN 1978 |
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| Authors:
H. S. Spacil; D. A. Shores; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| The electrical conductivities of polycrystalline NiO, single crystal NiO, and single crystal CoO were measured to determine: (1) the effect of SO2 in O2 - SO2 mixtures on conductivity, and (2) the effect of exposure to SO2 on defect diffusivity. Only the single crystal oxides proved to be satisfactory for measurement. Small conductivity increases of the order of 1% were found on exposure to SO2. Diffusivity measurements agreed well with ... |
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| Lead Zirconate Titanate (LZT) Ceramics. |
JUN 1978 |
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| Authors:
J. H. Rosolowski; R. H. Arendt; J. W. Szymaszek; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| Tests of batch-to-batch reproducibility of LZT powders made by molten salt synthesis were carried out by measuring the properties of ceramics fired from them. Individual post-poling dielectric constants and planar coupling coefficients lay within plus or minus 4% and plus or minus 7%, respectively, of the average of all samples fired in the same way. Striking similarities in characteristic aging behavior of the dielectric constant among all samples from all ... |
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| Unsteady Blade Rows in High-Speed Flow. |
MAY 1978 |
158 pages |
| Authors:
M. Kurosaka; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
 | This report covers analytic investigations toward defining the instability boundaries of low incidence supersonic compressor flutter. A closed form expression was developed for the unsteady pressure distribution for a flat plate cascade in supersonic flow which is valid for a frequency range of practical interest. The work was extended to symmetric parabolic arc airfoils in cascade. Finite thickness was shown to have a first order effect on the flow field. ... |
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| Research on Aluminum Nitride Materials. |
MAR 1978 |
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| Authors:
Glen A. Slack; Thomas F. McNelly; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| This report summarizes the progress made during the second year of AFOSR contract support in growing single crystals and producing ceramic samples of aluminum nitride for use as electronic heat sinks and surface acoustic wave (SAW) devices. An improved aluminum pellet-drop technique for making 70-g quantities of ALN starting material has been developed. By subliming and recondensing this material in sealed tungsten crucibles at temperatures between 2100 C and 2350 ... |
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| Modeling of III-V Field Effect Transistors. |
MAR 1978 |
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| Authors:
S. P. Yu; W. Tantraporn; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| The III-V field effect transistors were modeled using a time domain two-dimensional computer program. The device dynamics were deduced from the large signal time step impulse response. The computed cut-off frequency and intrinsic switching delay time as functions of gate length agree well with published data. The detailed internal carrier and potential distribution indicate persistent Gunn oscillation and significant current flow in the substrate for device with small gate length ... |
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| Flux Pinning and Critical Currents in A-15 Superconductors. |
FEB 1978 |
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| Authors:
J. D. Livingston; R. A. Sigsbee; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| The relationship between processing, microstructure, and properties was studied for A-15 compounds in multifilamentary composites produced by solid-state diffusion and in thin-film samples produced by vapor deposition. Grain sizes of A-15 superconducting compounds were measured by transmission electron microscopy of multifilamentary composites reacted at various temperatures. Critical current densities at 4.2 K and fields up to 6 T were found to be similar for niobium-tin, vanadium-gallium, and vanadium-silicon of the ... |
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| CRACK NUCLEATION IN 316 STAINLESS STEEL FUEL CLADDING |
78 |
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| Authors:
D. Lee; R. A. Rand; G. G. Trantina; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| aisi 316 was used in the 20 percent cold worked condition at a thickness of 1.37mm. the tests were taken in the transverse direction in air at 550 c and a strain rate of 0.00011/sec. the true stress-true strain curve is shown. the failure occurred in air by shearing and void nucleation and growth. fission products were evident near surface cracks after exposure to iodine. |
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| Superconducting Rotor Research. |
NOV 1977 |
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| Authors:
B. B. Gamble; T. A. Keim; P. A. Rios; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| This report summarizes work completed for the Air Force Aero Propulsion Laboratory in Phase I of a program entitled Superconducting Rotor Research. The objective of this program is to incorporate new materials in the design of an airborone, 20 MW, high-speed, superconducting generator. The rotor of the generator will be constructed and its current density demonstrated. The Phase I work consisted of a sizing study to select the machine configuration ... |
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| CID Processor Chip Development. |
NOV 1977 |
|
| Authors:
Gerald J. Michon; Hubert K. Burke; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| TV bandwidth reduction is required to achieve jam resistance in guided weapon and remotely piloted vehicle applications. One way to achieve bandwidth reduction is to eliminate redundant information prior to transmission. The high degree of redundancy in most images can be reduced by employing transform techniques to uncorrelate the scene information. A number of coding techniques can then be used to allocate the available bandwidth to the significant spatial information. ... |
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| Advanced Archival Memory. |
AUG 1977 |
|
| Authors:
C. Q. Lemmond; P. V. Gray; C. G. Kirkpatrick; J. F. Norton; H. G. Parks; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| During this reporting period, effort in the archival memory program included experimental and theoretical studies on planar diode substrates to determine a more exact doping profile measured by anodic oxidation and stripping techniques; improved implanting methods to place the peak of implant distribution near the N layer surface; writing experiments with a variety of implanted inert ions and a determination of the writing efficiencies; an initial model of the alloy ... |
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| Dynamic Impact Response Behavior of Polymeric Materials. |
AUG 1977 |
78 pages |
| Authors:
William B. Hillig; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| The work reported was devoted to making reliable, quantitative impact pulse measurements for free-flight encounters between a spherical projectile and the desired target material. The materials of interest continue to be polycarbonate PC, polymethylmethacrylate PMMA, and epoxy resins. Inorganic glass was also used as a target material because impacts can be confidently modeled from theory in this case. Impact pulse determinations were made on the four target materials with hardened ... |
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| Advanced Archival Memory. |
JUL 1977 |
|
| Authors:
C. Q. Lemmond; G. E. Possin; C. G. Kirkpatrick; H. G. Parks; J. F. Norton; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| During this reporting period, effort in the archival memory program included experimental work and theoretical studies on a planar diode structure (memory target substrate), implantation of ions to write information on a planar diode structure, feasibility studies of the alloy junction method of writing, and the specification of a high performance electron beam write station for alloy junction writing. A detailed analytical modeling study was initiated in order to properly ... |
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| Improvement of GaAs Crystal Quality by Means of Liquid-Solid Interface Curvature Control. |
JUL 1977 |
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| Authors:
W. Tantraporn; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| A solid-convex condition for growth of GaAs single crystal from the melt is sought, so that crystal quality may improve as a function of length. A short-dipole-like thermal configuration with calibrated temperature profile was used in the vertical zone melting technique. but was abandoned because equilibrium vapor transport could not be maintained. Solidification of Iong melt from one end across the melting point equitemperature surface also failed to yield good ... |
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| Interface Doping of MNOS Transistors. |
JUN 1977 |
|
| Authors:
C. A. Neugebauer; M. M. Barnicle; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| This Interim Technical Report describes the progress for the 1 April 1976 to March 1977 period of Phase I of the Interface Doping of MNOS program. Use of Cr, W, Pt, Ni, Pd and Ir as interface dopant in monolayer quantities between an oxide layer of Fowler-Nordheim tunneling thickness and 300-500A of Si3N4 gives MNOS memory retention of electrons of many centuries even at elevated temperatures, while retaining high write ... |
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| Investigation of Ceramics for High Temperature Turbine Components. |
JUN 1977 |
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| Authors:
Curtis A. Johnson; Svante Prochazka; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| The mechanical properties of boron-doped sintered SiC were studied as a function of several fabrication and testing variables. The reduction in severity of surface defects due to the dissociation of SiC at high temperatures was characterized as a function of furnace pressure during sintering and as a function of refiring temperature after machining. The beta to alpha polytype transformation and the accompanying grain growth were found to decrease the strength ... |
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| Lead Zirconate Titanate (LZT) Ceramics. |
JUN 1977 |
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| Authors:
J. H. Rosolowski; R. H. Arendt; J. W. Szymaszek; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| A method of producing fully reacted, homogeneous lead zirconate titanate powders including all the technologically important property modifying additives is described. The method involves reacting mixture of powders of the components together with a eutectic NaCl-KCl mixture at a temperature where the salt is molten. The properties of piezoelectric ceramics made of such powders are compared to data from ceramics fabricated from powder made by calcination. Ceramics made from molten ... |
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| Investigation of the Behavior of High-Anisotropy Permanent Magnet Materials. |
MAY 1977 |
|
| Authors:
J. J. Becker; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| This report describes investigations related to the origin of the magnetic coercive force in high-anisotropy materials that have taken place over a three-year period of contract support. Such materials with sufficiently high saturation magnetization supply the basis for the development of permanent magnets superior to anything currently available. A microsample technique developed in this work has made it possible to show for the first time that conventionally sintered bulk Co5Sm ... |
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| Advanced Archival Memory. |
APR 1977 |
|
| Authors:
C. Q. Lemmond; C. G. Kirkpatrick; J. F. Norton; H. G. Parks; G. E. Possin; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| The objective of this research is to investigate the feasibility of new storage techniques for large archival memories using ion and electron beam with semiconductor targets. The goal is the development of an archival memory capable of storing 10 to the (14th to 15th) power bits with rapid access to the stored information. During this reporting period, effort included experimental work and theoretical studies on planar diode structures (memory target ... |
|
| Estimates and Approximate Confidence Limits for (LOG) Normal Life Distributions from Singly Censored Samples by Maximum Likelihood. |
APR 1977 |
|
| Authors:
Josef Schmee; Wayne Nelson; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| This report presents a simple table for maximum likelihood estimates of the parameters of a normal or lognormal life distribution when the data are analyzed before all test units fail. The report also presents a table of the large-sample variances and covariances of the parameter estimates; the report shows how to use this table to obtain approximate confidence limits for the parameters and other quantities, such as failure probabilities. An ... |
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| Advanced Archival Memory. |
APR 1977 |
|
| Authors:
C. Q. Lemmond; P. V. Gray; C. G. Kirkpatrick; B. D. NATHAN; J. F. Norton; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| During this reporting period, effort in the archival memory program included experimental work and theoretical studies on planar diode structures (memory target substrate), implantation of ions to write information on a planar diode structure, feasibility studies of the alloy junction method of writing using a Nd:YAG laser, the design and construction of a heated stage for alloy junction studies and the initiation of writing optics studies. Studies and experimental verifications ... |
|
| Bisphenol Fluorenone Carbonate-Silicone Block Polymers: Improved Synthesis and Further Studies of Mechanical and Flammability Properties. |
APR 1977 |
|
| Authors:
R. P. Kambour; J. E. Corn; H. J. Klopfer; S. Miller; C. M. Orlando; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Several changes in synthesis and processing procedures have been resulted in BPF carbonate-silicone plastics of controlled molecular weight and improved transparency. Ultrapurification of the BPF monomer, use of rigorously dry environments and reagents, use of ammonia as the base in the silicone endcapping step, the return to chloroform as the polymerization solvent, the addition of excess base and phosgene during polymerization, and rapid polymer isolation washing and drying minimized molecular ... |
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| Investigation for the Origin of Magnetic Properties in Amorphous Metallic Alloys. |
MAR 1977 |
|
| Authors:
GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| The General Electric Research and Development Center started work on amorphous metallic alloys late in 1974. Principal interest has been in the magnetic properties of these alloys. Their mechanical properties, structure, stability and corrosion resistance, and potential applications have also been studied. |
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| Design, Fabrication, and Evaluation of an Electron Beam Addressable High Information Density Memory Tube. |
FEB 1977 |
|
| Authors:
Charles Q. Lemmond; Conilee G. Kirkpatrick; George E. Possin; William C. Hughes; T. H. Klotz Jr; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| BEAMOS tubes, designed and constructed prior to this contract, were tested to determine their ability to meet various environmental requirements. Although the tubes were not designed specifically with these requirements in mind, data were gained during the tests for use in effecting a re-design of the tube. Two tubes were fabricated embodying the suggested design improvements. Other design improvements, brought about by General Electric's inhouse BEAMOS development program, were also ... |
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| Basic Research on Technology Development for Sintered Ceramics. |
NOV 1976 |
|
| Authors:
Charles D. Greskovich; Svante Prochazka; Joseph H. Rosolowski; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Pure silicon nitride powder is prepared by calcination of the reaction product obtained from SiH4 and anhydrous NH3 at 600 C and above. It is amorphous up to 1480 degrees and converts to alpha-Si3N4 above this temperature. Hot-pressing at 5 GPa at 1500 C and above yields dense specimens of near theoretical density and up to 3000 kg/sq m Knoop microhardness (200 g load). Annealing at 1750 C does not ... |
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| Impact Response Characteristics of Polymeric Materials. |
SEP 1976 |
|
| Authors:
William B. Hillig; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Stress relaxation and creep behavior of PC and PMMA were studied under conditions of constant velocity loading followed by halts. This information was used to deduce relaxation-corrected, force-incursion depth behavior. Measurements of force versus depth were also made on sinusoidally programmed indentation. The evaluation of the 'densified' zone forming under the contact area was followed cinematographically. Models were developed including one that leads to the time and velocity dependence of ... |
|
| Design, Fabrication, and Evaluation of an Electron Beam Addressable High Information Density Memory Tube. |
JUN 1976 |
|
| Authors:
C. Q. Lemmond; W. C. Hughes; C. G. Kirkpatrick; E. C. Buschmann; H. W. Grup ; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Electron Optical component improvements were made to simplify the tube construction and as first steps toward ruggedizing the tube. These modifications were thoroughly tested, and the results indicate extremely stable beam control as well as a design that can more easily be made rugged. Tests to verify tube operation capability at 10 megabit data rates were successfully completed. Storage target improvements continue. (Author) |
|
| Program and Abstracts for the International Conference on Supersonic Conductors: Chemistry, Physics, and Applications, May 10-12, 1976. |
MAY 1976 |
|
| Authors:
G. D. Mahan; W. L. Roth; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Substantial improvements are needed in organic and solid electrolytes to increase conductivity to that achieved in aqueous electrolytes. These solid electrolytes have a much wider temperature range and are needed to be used in new high energy, high charge and discharge rates rechargeable batteries. The objectives met in this symposium is to foster discussions among scientists from diverse fields regarding the status of understanding superionic conductors and the new problems ... |
|
| Design, Fabrication, and Evaluation of an Electron Beam Addressable High Information Density Memory Tube. |
JAN 1976 |
|
| Authors:
Charles Q. Lemmond; W. C. Hughes; H. A. Gauper Jr.; George E. Possin; James K. Fisher; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Radio-frequency interference tests were conducted to determine the tube's susceptibility to this form of interference. The tube performed without error for interference values within specification. A new electron gun with smaller beam spread was constructed and tested. Shielding improvements were made to the BEAMOS tube. Data were gathered on electronic interface equipment tolerances. (Author) |
|
| Investigation of Ceramics for High Temperature Turbine Components. |
DEC 1975 |
|
| Authors:
Svante Prochazka; Curtis A. Johnson; Robert A. Giddings; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| The sintering kinetics of boron-doped SiC were studied in a high temperature dilatometer and discussed in terms of density and densification rate vs. temperature, time, sintering atmosphere, green density and initial crystallite size. A nitrogen furnace atmosphere was found to retard sintering and halt the Beta to alpha transformation. The fracture strength of sintered SiC was characterized in three-point bending as a function of powder processing technique, sintering atmosphere, density, ... |
|
| Metallic Composites Formed 'in situ' by Reactions in the Solid State. |
NOV 1975 |
|
| Authors:
James D. Livingston; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| The major portion of this year's effort was study of the effects of alloying elements on the structure and properties of aligned Co-Si eutectoid. Of the nine alloying elements studied, only Ni could be added in appreciable quantities without disturbing the aligned eutectoid microstructure. Additions of Cr, Fe, Mn, or Cu produced cellular eutectoid microstructures. Additions of W, Ta, or Al produced eutectic, rather than eutectoid, microstructures. Most alloying additions ... |
|
| Design, Fabrication, and Evaluation of an Electron Beam Addressable High Information Density Memory Tube. |
OCT 1975 |
|
| Authors:
C. Q. Lemmond; W. C. Hughes; C. G. Kirkpatrick; G. E. Possin; J. K. Fisher; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| The tube is to be a sealed-off, self-contained unit consisting of an electron source, the necessary electron optics for performing the required write and read functions, and a storage structure containing approximately 1.8 x 10 to the 7th power elements. A reliable and well-engineered memory tube demonstrating life and environmental characteristics are objectives of this program. Two memory tubes are the goal of the program. Vibration tests were conducted on ... |
|
| Research with in-situ Composites Aligned with Eutectoid and Eutectic Transformations. |
AUG 1975 |
|
| Authors:
J. G. Smeggil; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Directionally aligned eutectoids are of potential interest for high temperature turbine applications. The Hf-HfCr2 eutectoid was selected from several systems, to explore the potential of using solid-solid transformation to yield a suitable, aligned microstructure. A series of Ni-TaC alloys and a Ni(Cr)-Ni3Al-Ni3Nb alloy have been examined in oxidation. Numerous effects dependent on microstructures, chemistry, and oxidation temperature were observed. Chemical vapor deposition (CVD) techniques were used to deposit simple and ... |
|
| Impact Response Characteristics of Polymeric Matrices. |
AUG 1975 |
|
| Authors:
William B. Hillig; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Impact/indentation velocity measurements on polycarbonate (PC) and polymethylmethacrylate (PMMA) have been measured to 6000 inches/minute using a 4.5 mm diameter ball as the impacting object. The 'best' force versus penetration depth values are given covering the range .0002 inches/minute to the maximum. Load relaxation measurements are reported and are found to have a characteristic time-decay constant inversely proportional to the impact velocity. This anomalous result causes a sensitive time dependence ... |
|
| Quantum Theoretical Studies of Gas-Solid Interactions. |
AUG 1975 |
|
| Authors:
R. P. Messmer; C. W. Tucker; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| In this final report, the authors summarize the results of their theoretical investigations into gas-solid interactions. In order to provide a proper perspective, they succinctly compare their approach to the more traditional solid state approaches to this problem. As previous reports have described our earlier work in some detail, they briefly review this prior work here. The main emphasis of this report is on theoretical gas-solid studies completed during the ... |
|
| Solid-State Properties of Transition Metal Complexes. |
AUG 1975 |
|
| Authors:
L. V. Interrante; J. S. Kasper; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| The report describes the work on solid-state properties of transition metal complexes. Several different types of transition metal complex systems with anisotropic solid-state interactions have been prepared and studied using electrical conductivity, magnetic susceptibility, and spectral measurement methods. The results of these measurements and accompanying x-ray structural studies have been used to derive structure-property relationships and to obtain information regarding the nature of the intermolecular interactions occurring in the solid ... |
|
| High Power Nd: YAG Mini-FPL. |
13 JUL 1975 |
|
| Authors:
Joseph P. Chernoch; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| The program has encompassed the design, engineering development, and testing of a laboratory prototype device with the objective of greater than 100 watts cw multimode. In performance tests, the maximum multimode output beam power was 3000W with lamp input power of 20kW. Maximum output/input efficiency was 1.6% at an output beam power of 240W. With an intracavity polarizer and with the cavity optics adjusted to restrict the output beam divergence ... |
|
| Bisphenol Fluorenone Carbonate-Simethyl Siloxane Block Polymers: Transparent, Tough, Heat- and Flame-Resistant Thermoplastics. |
JUL 1975 |
|
| Authors:
R. P. Kambour; J. E. Corn; S. Miller; G. E. Niznik; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
|
| Synthesis on the 100g scale of BPF carbonate-dimethyl siloxane block polymers containing minor amounts of silicone has been improved to the point that resins of the desired silicone content and molecular weight can be closely reproduced. A number of simplifying changes have been made in the synthesis procedure during subsequent scale-up. Extrusion and injection molding of these resins into articles of good clarity and mechanical integrity have been mastered. Color ... |
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| Ceramic Sintering. |
JUL 1975 |
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| Authors:
Charles D. Greskovich; Joseph H. Rosolowski; Svante Prochazka; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| Measurement of the rate of oxidation and creep rate in air of chemically vapor deposited Si3N4 at around 1500C are reported. Attempts to prepare pure, dense Si3N4 bodies by hot pressing powder at ultra-high pressures were partially successful. Resistance heaters made of dense, sintered SiC were tested and found to have in-use lifetimes at least 10 times longer than those of commercially available heaters tested in the same way. It ... |
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| THE INFLUENCE OF CARBON PARTICLES ON HOT CORROSION |
JUN 75 |
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| Authors:
D. W. Mckee; G. Romeo; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| Carbon deposition, by promoting local reducing conditions, may play an important role in the occurrence of hot corrosion in gas turbines. Carbon can form as a result of the incomplete combustion of liquid fuel droplets and from gaseous hydrocarbons present in the combustion gases. Sodium sulfate condensate, generated by impurities in the fuel, can be reduced to more corrosive sulfide in the presence of uncombusted gaseous hydrocarbons which decompose catalytically ... |
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| Properties of Microsamples of Sintered Cobalt-Samarium Magnets. |
JUN 1975 |
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| Authors:
J. J. Becker; GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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| Hysteresis loops of small but still multigrain samples taken from sintered Co5 Sm magnets show a wide range of behavior, samples from the same magnet bracketing the bulk properties. Magnetization discontinuities often appear and are associated with large grains. These jumps show a quantized dependence of jump field on magnetizing field as in particles prepared from cast material. A sample consisting of only one grain gave a completely rectangular loop. ... |
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Reports by Corporate Author
