| High Stiffness High Damping Structure |
28 FEB 2002 |
9 pages |
| Authors:
R. Radhakrishnan; S. Kotha; K. Sylvester; MATERIALS MODIFICATION INC FAIRFAX VA
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 | This effort was an investigation on the preparation of a novel smart structure with tunable damping and stiffness properties. This structure was a Magneto-rheological (MR) fluid filled volumetrically stiff cylinder. The MR fluid contained magnetic particles with various particle sizes ranging from nanometers (15-20 nm) to several microns (45 microns). An application of an external magnetic field would then alter the rheology of the MR fluid thereby resulting in variation ... |
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| Multilayer Microlaminated Ceramic Thermal Barrier Coating |
14 MAY 97 |
49 pages |
| Authors:
Charles Yu; Zhengui Yao; Krupashankara; MATERIALS MODIFICATION INC FAIRFAX VA
|
| This report describes the Phase I efforts to develop a new approach for applying micro-laminated thermal barrier coatings on superalloys through a sol-gel process. This new approach has better control of not only the process parameters but also the coating compositions and microstructures. Both thermal and mechanical characteristics of the coatings can be potentially optimized, and the coating will be more tolerant towards strain damage, have better thermal insulation and ... |
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| Multilayer Microlaminated Ceramic Thermal Barrier Coating |
14 MAY 97 |
25 pages |
| Authors:
Charles Yu; Zhengui Yao; Krupashankara Ms; Joseph Ritter; MATERIALS MODIFICATION INC FAIRFAX VA
|
| This report describes the Phase I effort to develop a new-approach for applying micro-laminated thermal barrier coatings on superalloys through a sol-gel process. This Phase I has demonstrated the following: (1) Cubic zirconia (yttria-stabilized-zirconia) can be coated through a sol-gel process onto bond coated superalloys. The films have very good adhesion and cohesion demonstrated by tape test. The films on the other side of the superalloy without bond coat peeled ... |
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| Synthesis and Consolidation of Nanoparticles |
JUL 94 |
22 pages |
| Authors:
T. S. Sudarshan; Jacob J. Stiglich; R. J. Dowding; MATERIALS MODIFICATION INC FAIRFAX VA
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| Nanomaterials synthesis and characterization have been very active development fields for many years, motivated by the prospect of extremely high mechanical properties coupled with useful plasticity and elevated temperature properties. We will briefly review the history of nanomaterials research, describe the principal synthesis routes for particles, and review the availability of consolidation technology capable of producing shapes which may demonstrate the physical properties which researchers have predicted and expected. We ... |
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| Materials and Manufacturing Processes. Volume 9. Number 1 |
94 |
190 pages |
| Authors:
T. S. Sudarshan; T. S. Srivatsan; MATERIALS MODIFICATION INC FAIRFAX VA
|
| Materials and Manufacturing Processes is a journal in the English language providing an international forum for current developments and future direction in the area of materials and manufacturing processes. Manuscripts may fall into several categories including full articles, solicited reviews, or commentary, unsolicited reviews or commentary, and patent and book reviews. |
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| Materials and Manufacturing Processes. Volume 9. Number 2 |
94 |
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| Authors:
T. S. Sudarshan; T. S. Srivatsan; MATERIALS MODIFICATION INC FAIRFAX VA
|
 | Contents: Processing of Carbon Fibers: Texture Enhancement Induced by Hot Stretching; Carbon Fiber Processing: Effects of Hot Stretching on Mechanical Properties; Carbon Fibers from Polyethylene-Based Precursors; Rapid Vapor Grown Carbon Fiber Production Using the Intermittent Liquid Pulse Injection Technique; Preparation of Metal-Coated Carbon Fiber Reinforced Composites and Their Electromagnetic Properties; Electrolytic Metallic Coatings for Carbon Fibers; Processing and Heat Treatment Effects on an Al2O3/Ni3Al Composite; Fiber Metal Laminates-The Synthesis of ... |
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| Materials and Manufacturing Processes. Volume 9. Number 3 |
94 |
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| Authors:
T. S. Sudarshan; T. S. Srivatsan; MATERIALS MODIFICATION INC FAIRFAX VA
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| This paper addresses the feasibility of friction welding as an approach to join aluminum to ceramics. Potential advantages include the localised heating below the melting point of the parent materials, and the short time required to produce the bond. Metal/ceramic combinations examined include aluminum/silicon nitride, aluminum/silicon carbide, aluminum/zirconia and aluminum/aluminum nitride. |
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| Materials and Manufacturing Processes. Volume 9. Number 4. 1994 |
94 |
|
| Authors:
MATERIALS MODIFICATION INC FAIRFAX VA
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| A new model for monosized particle packing is developed in this study in simulating CIP powder compaction. The model uses a central growth method by which particles are placed from a central particle outwards until a specified container is filled. The simulation program is able to generate a particle packing of 5000 particles with characteristics that are similar to experimental results with significantly short computational time. A particle packing with ... |
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| Materials and Manufacturing Processes. Volume 9. Number 5. 1994 |
94 |
|
| Authors:
T. S. Sudarshan; T. S. Srivatsan; MATERIALS MODIFICATION INC FAIRFAX VA
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| Partial contents: Processing of Bamboo Fiber Reinforced Plastic Composites; Effects of Processing Variables on Fatigue in Molded PEEK and Its Short Fiber Composites; PC-Based Monitoring and Control System for Microwave Curing of Polymer Composites; Densification Rates of Ceramic Matrix Composites with Initial Matrix Inhomogeneity; The CVD of Ceramic Protective Coatings on SiC Monofilaments for Use in Titanium Based Composites; C.V.D. Coating of Alumina Reinforcing Particles to Improve the Wear Resistance ... |
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| Solid Lubricants for Space Structures. Phase 2 |
14 JUN 93 |
97 pages |
| Authors:
T. S. Sudarshan; MATERIALS MODIFICATION INC FAIRFAX VA
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| In this Phase 11 effort, copper-lead alloys of three different compositions (90-10, 75/25, and 50/50 copper-lead) were processed by swirl die continuous casting in the form of ingots and further processed into powders using the gas atomization method. The powders were compacted using shock campaction and hot isostatic pressing. Friction and wear studies revealed that the 75/25 alloys had the best friction and wear rates under a range of sliding ... |
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| Materials and Manufacturing Processes. The Electroimpact Compaction of Powders: Mechanics, Structure and Properties. Volume 8, Number 3 |
MAY 93 |
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| Authors:
T. S. Sudarshan; T. S. Srivatsan; MATERIALS MODIFICATION INC FAIRFAX VA
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| Topics include: The electroimpact compaction of powders: mechanics, structure, and properties; Laser processing of metallic and intermetallic surfaces; Thin alumina and silica films by chemical vapor deposition (CVD); CVD of silicon nitride plate from HSiCI3-H2 mixtures; Single-pass curtain coating; and Review of some processes for ceramic-to-metal joining |
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| Materials and Manufacturing Processing; Special Issue on Hard Carbon Films |
93 |
139 pages |
| Authors:
T. S. Sudarshan; T. S. Srivatsan; MATERIALS MODIFICATION INC FAIRFAX VA
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| Laser processing of polycrystalline diamond and amorphous carbon films is shown to be a promising technology for micropatterning of these materials in electronics and other applications. By using excimer lasers, holes and pits have been formed in 10-60 micrometers thick diamond films by physical etching with ablation rates of up to 300 nm/pulse. The channels of micrometer scale width were created in diamond-like carbon films on silicon by chemical etching ... |
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| Materials and Manufacturing Processes. Special Issue on Ceramic-Metal Joining. Volume 8, Number 2 |
93 |
|
| Authors:
T. S. Sudarshan; T. S. Srivatsan; MATERIALS MODIFICATION INC FAIRFAX VA
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| In this paper the technology for joining metals to ceramics is reviewed. The technologies of metal powder sintering, liquid phase joining with activated brazing alloys and with ceramic frit, solid-state joining, friction welding and mechanical fixation are described. In order to put some perspective on the mechanical data given in the literature, some evaluating remarks on mechanical testing are made. |
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| Materials and Manufacturing Processes, Volume 8, Numbers 4 and 5, 1993 |
93 |
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| Authors:
T. S. Sudarshan; T. S. Srivatsan; MATERIALS MODIFICATION INC FAIRFAX VA
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| Partial Contents: Preparation, Properties and Structure of Metal Containing Amorphous Hydrogenated Carbon Films; Use of Thin Solid Films at Head/ Magnetic Media Interfaces; Laser Induced Microcrystallization of Bulk Amorphous Ge15Se(85-x)Te(x); Superconductive Films by Laser Post-treatment of Thermal- Sprayed Films; Development of Plasma Sprayed Lubricant Free Slide Plates with Ceramic Coat for Railway Use; The Thermal Shock Endurance of a Plasma Sprayed ZrO2 Coating on Steel; Solid Solution Approach for the ... |
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Reports by Corporate Author
