Abstract
Thermal spray methods offer a versatile and flexible approach to the manufacture of coatings as a final product. A novel application of thermal spray coating is demonstrated by incorporating a plasma-sprayed Mo layer coating as a precursor step within an integrated costing design. The effectiveness of the two-step design is illustrated for aluminoborosilica coatings on SiC/C composites and W substrates based on the plasma-sprayed Mo precursor and subsequent codeposition of Si and B by a pack cementation method. Even with incomplete precursor coverage, an aluminoborosilica coating is developed because of the high initial fluidity of the as-pack coating. An effective oxidation resistance is observed following exposure at elevated temperatures (1373-1673 K) in ambient air and during torch testing at 1773 K, providing clear evidence that the plasma spraying of Mo is a viable precursor step in the formation of the oxidation-resistant Mo-Si-B-based coating.
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The supports from ONR (N00014-10-1-0913, Dr. David A. Shifler program manager) and DOE-NETL (Grant Number: FE0007377) at the University of Wisconsin-Madison are gratefully acknowledged.
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Ritt, P., Lu-Steffes, O., Sakidja, R. et al. Application of Plasma Spraying as a Precursor in the Synthesis of Oxidation-Resistant Coatings. J Therm Spray Tech 22, 992–1001 (2013). https://doi.org/10.1007/s11666-013-9947-2
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DOI: https://doi.org/10.1007/s11666-013-9947-2