Application of plasma spraying as a precursor in the synthesis of oxidation-resistant coatings
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.
aerospace, aircraft, high-temperature application
Ritt, P., O. Lu-Steffes, R. Sakidja, J. H. Perepezko, W. Lenling, D. Crawmer, and J. Beske. "Application of plasma spraying as a precursor in the synthesis of oxidation-resistant coatings." Journal of thermal spray technology 22, no. 6 (2013): 992-1001.
Journal of Thermal Spray Technology