Journal
JOM
Volume 62, Issue 10, Pages 13-19Publisher
SPRINGER
DOI: 10.1007/s11837-010-0148-x
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Funding
- Office of Naval Research [N00014-10-1-0913]
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The synthesis of robust coatings that provide protection against environmental attack at ultra-high temperatures is a difficult challenge. In order to achieve this goal for Mo-based alloys the fundamental concepts of reactive diffusion pathway analysis and kinetic biasing are used to design a multilayer coating with a phase sequencing that provides for structural and thermodynamic compatibility and an underlying diffusion barrier to maintain coating integrity. The coating structure evolution during high-temperature exposure facilitates a prolonged lifetime as well as a self-healing capability. Both borosilicide and aluminide coatings that can be synthesized by a pack cementation process are demonstrated to yield superior environmental resistance on Mo-based systems at temperatures up to l,700A degrees C and can be adapted to apply to other refractory metal systems.
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