Journal
ANNUAL REVIEW OF MATERIALS RESEARCH, VOL 45
Volume 45, Issue -, Pages 519-542Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-matsci-070214-020959
Keywords
oxidation; coating design; environmental resistance; refractory metals; ultrahigh temperature
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Funding
- ONR at the University of Wisconsin, Madison [N00014-10-1-0913]
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The synthesis of robust coatings that provide protection against environmental attack at ultrahigh temperatures is a difficult challenge. To achieve this goal for Mo-base alloys, the fundamental concepts of reactive diffusion pathway analysis and kinetic biasing are used to design a multilayer Mo-Si-B-base coating with a phase sequencing that allows for structural and thermodynamic compatibility and an underlying diffusion barrier to maintain coating integrity. The coating design concepts have a general applicability. The coating structure evolution during high-temperature exposure facilitates a prolonged lifetime as well as self-healing capability. The borosilicide coatings that can be synthesized by a pack cementation process yield superior environmental resistance for Mo-base systems at temperatures up to at least 1,700 degrees C and can be adapted to apply to other refractory metal and ceramic systems.
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