| A Mechanism for Blistering of Carbon Fiber Composites |
03 NOV 94 |
14 pages |
| Authors:
S. K. Miriyala; T. J. Rockett; W. C. Tucker; R. Brown; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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 | Blisters containing fluid with a high pH were induced in a carbon fiber vinyl ester polymer matrix composite by cathodic polarization in a sodium chloride solution. The oxygen content of the solution was varied in order to determine the effect of oxygen on the blister process. It was found that increasing the oxygen content in solution decreased the time for blister initiation, indicating that the reduction of oxygen to form ... |
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| A Mechanism for Blistering of Carbon Fiber Composites |
23 JUN 94 |
14 pages |
| Authors:
S. K. Miriyala; T. J. Rockett; W. C. Tucker; R. Brown; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| Blisters containing fluid with a high pH were induced in a carbon fiber vinyl ester polymer matrix composite by cathodic polarization in a sodium chloride solution. The oxygen content of the solution was varied in order to determine the effect of oxygen on the blister process. It was found that increasing the oxygen content in solution decreased the time for blister initiation, indicating that the reduction of oxygen to form ... |
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| The Effect of Carbon Fiber Type on the Electrochemical Degradation of Carbon Fiber Polymer Composites, Tri-Service Committee on Corrosion Proceedings |
JUN 94 |
20 pages |
| Authors:
J. Qin; R. Brown; S. Ghiorse; R. Shuford; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| The galvanic interaction between metals and carbon fiber/polymer matrix composite degrades not only the metals but the composite itself. The objective of this study was to investigate if the fiber type influenced either the mechanism or form of damage. Two different composites were examined. Both have same epoxy matrix, 3501-6 epoxy, but contain different carbon fibers, either AS4 or IM6. The surfaces of the composite materials were exposed to 0.5 ... |
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| Blistering of Graphite/Polymer Composites Galvanically Coupled with Metals in Sea Water |
93 |
26 pages |
| Authors:
Richard Brown; Thomas J. Rockett; Wayne C. Tucker; Shravan K. Miriyala; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| The effects of bulk oxygen partial pressures on the galvanic blister growth in carbon fiber vinyl ester composites were studied. Varying oxygen concentrations significantly affected the corrosion currents when the samples were subjected to a cathodic potential of -900 mV (SCE). An increase in oxygen concentration proportionately increased the corrosion currents which is an almost certain evidence that oxygen reduction reaction occurs on carbon fibers in the composite. The blister ... |
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| Effect of Composition and Thickness on Corrosion Behavior of TiN and ZrN Thin Films. |
1993 |
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| Authors:
R. Brown; M. N. Alias; R. Fontana; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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 | The corrosion behavior of TiN and ZrN coatings thickness from 5 to 10 microns on AISI 304 stainless steel in 0.5 N NaCl solution was investigated. Electrochemical impedance spectroscopy, scanning electron microscopy and X-ray photoelectron spectroscopy were the techniques applied to characterize fully the corrosion behavior. From the data, TiN acts as an inert coating, while the ZrN coating reacts with the environment. It is proposed that the nitrogen in ... |
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| Cyclic Hot Corrosion of Haynes 230 Alloy |
92 |
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| Authors:
Fen-Ren Chien; Richard Brown; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| Cyclic hot corrosion conducted on Haynes 230 at temperatures of 871 and 1093C indicated that catastrophic corrosion occurred; the corrosion rate was related to the high content of tungsten and chromium in the alloy; the concept of basic and acid fluxing was applied to explain the dissolution of the protective film of Cr2O3 and volatile WO3 by an Na2SO4-rich liquid due to the formation of Na2CrO4 and Na2WO4; as the ... |
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| Degradation of Polymeric Matrix Materials in Seawater. |
1992 |
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| Authors:
Wayne C. Tucker; Thomas J. Rockett; Richard Brown; Shravan V. Miriyala; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| Factors which produce polymer degradation related to moisture phenomena in seawater are discussed. A new blistering mechanism generated by corrosion reactions in graphite/polymers is examined in light of what is known to occur in fiberglass composite blistering. Other consequences of seawater corrosion reactions and electric fields in composites with conductive fibers are discussed. Environmental stresses induced by ocean environments are examined and evaluated as risks when occurring alone and in ... |
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| Sputtered TiN Thin Films for Improved Corrosion Resistance |
91 |
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| Authors:
P. Bhardwaj; O. J. Gregory; K. Bragga; M. H. Richman; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| Computer Simulation of the Microstructure Developed in Reaction-Sintered Silicon Nitride Ceramics |
90 |
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| Authors:
Wenfu Ku; Otto J. Gregory; Hamlin M. Jennings; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| A simulation model of the microstructure developed during the reaction sintering of ultrafine silicon powders is presented. The model employs interactive subroutines that describe particle compaction, sintering, and nitridation. The particle compaction model is based on a random particle packing model, whereas the sintering and reaction sintering models are based on the modified grain model and the sharp interface model (SIM). Microstructural changes due to the competition between chemical reaction ... |
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| The Prevention and Repair of Gel Coat Blisters |
OCT 88 |
13 pages |
| Authors:
Thomas J. Rockett; Vincent Rose; Andra Kirsteins; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| This is a brief summary in layman's language of an in-depth, impartial, scientific study to determine the best methods of repairing blister damaged fiberglass boats. Preventive Maintenance and Blister Repairs are the two topics discussed in this report. Keywords: Fiberglass hulls; Boat hulls; Boat repair. (kt) |
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| Boat Hull Blisters: Repair Techniques and Long Term Effects on Hull Degradation |
AUG 88 |
148 pages |
| Authors:
Thomas J. Rockett; Vincent Rose; Andra Kirsteins; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| The report documents the research and experimental work undertaken to further explore the causes and nature of osmotic blisters, experiments performed in techniques to reduce the formation of the blisters and repair of damage caused by the formation of blisters. The work is contained in the following sections: Introduction; Causes and Nature of Boat Hull Blisters; Water Solubles - Air Inhibition Studies; Water Solubles Associated with Glass Reinforcements; Swelling Stresses ... |
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| The Causes of Boat Hull Blisters |
MAY 87 |
35 pages |
| Authors:
Thomas J. Rockett; Vincent Rose; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| This report is a highly-readable and condensed summary of the work undertaken to investigate the causes of blistering in fiberglass reinforced polyester composites, the structural material of many small boats, which are subject to blistering. The report is divided into the following sections: Introduction; How Blisters Form; the Hull Material; Manufacturing Processes; Water Diffusion in Hull Materials; Stresses in Hull Materials; Testing for Blister Resistance; Types of Blisters; Leaching of ... |
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| The Causes of Blistering in Boat Building Materials |
AUG 86 |
86 pages |
| Authors:
Thomas J. Rockett; Vincent Rose; John Florio; Alan R. Choiniere; C. Michael Trottier; RHODE ISLAND UNIV KINGSTON DEPT OF CHEMICAL ENGINEERING
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| The highly technical document details the experimentation and research undertaken to more clearly define the nature and causes of osmotic blisters which develop in fiberglass reinforced plastics used in the construction of boats. The document is divided into the following topics: Introduction; Hull Material; Water Diffusion; Nucleation of Blisters; Blister Growth; Long Term Deterioration; Experimental Results: Blister Resistance; Net Weight Change Experiments; Permeability; Exotherm Experiment; Air Inhibition Studies; Stress Measurement ... |
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