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CVD aluminiding process for producing a modified platinum aluminide bond coat for improved high temperature performance
CVD aluminiding process for producing a modified platinum aluminide bond coat for improved high temperature performance
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机译:用于生产改进的高温性能的改性铝化铂粘结涂层的CVD铝化工艺
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摘要
A method of depositing by chemical vapor deposition a modified platinum aluminide diffusion coating onto a superalloy substrate comprising the steps of applying a layer of a platinum group metal to the superalloy substrate; passing an externally generated aluminum halide gas through an internal gas generator (8) which is integral with a retort (2), the internal gas generator (8) generating a modified halide gas; and co-depositing aluminum and modifier onto the superalloy substrate. In one form, the modified halide gas is hafnium chloride and the modifier is hafnium with the modified platinum aluminum bond coat comprising a single phase additive layer of platinum aluminide with at least about 0.5 percent hafnium by weight percent and about 1 to about 15 weight percent of hafnium in the boundary between a diffusion layer and the additive layer. The bond coat produced by this method is also claimed. IMAGE
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