The purpose of the program was to develop improved processing techniques for depositing the NS-4 coating on columbium alloys. The NS-4 coating consists of depositing a vacuum sintered modifier layer (nominal composition 20Mo-50W-15Ti-15V) and then siliciding the modifier layer. The objectives of this program were to develop an electrophoretic process for depositing the modifier layer and a chemical vapor deposition process for siliciding the modifier layer. Electrophoretic deposition from both ...
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