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- Title
Extended Functionality of Environmentally-Resistant Mo-Si-B-Based Coatings.
- Authors
Perepezko, J.; Sakidja, R.
- Abstract
Multiphase Mo-Si-B alloys with compositions which yield the ternary intermetallic MoSiB (T) phase as a key microstructure constituent together with the Mo and MoSi phases, offer an attractive balance of high melting temperature, oxidation resistance, and mechanical properties. The investigation of reaction kinetics involving the T phase enables the analysis of oxidation in terms of diffusion pathways and the design of effective coatings. From this basis, kinetic biasing is used together with pack cementation to develop Mo-Si-B-based multilayered coatings with an aluminoborosilica surface and in situ diffusion barriers with self-healing characteristics for enhanced oxidation resistance. While a combustion environment contains water vapor that can accelerate an attack of silica-based coatings, the Mo-Si-B-based coatings provide oxidation resistance in water vapor up to at least 1,500°C. An exposure to hot ionized gas species generated in an arc jet confirms the robust coating performance in extreme environments. To extend the application beyond Mo-based systems, a two-stage process has been implemented to provide effective oxidation resistance for refractory metal cermets, SiC and ZrB ultra-high-temperature composites.
- Subjects
ALLOYS; INTERMETALLIC compounds; COMPOSITE materials research; SURFACE coatings
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2013, Vol 65, Issue 2, p307
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-012-0520-0