Abstract
The structure of low-pressure plasma sprayed ceramic coatings on a molybdenum substrate depends on the spray parameters. Porosity decreases with decreasing chamber pressure for all mullite and alumina coatings investigated, whereas the number of cracks decreases for the mullite-type coatings and increases for the alumina-type coatings. The structure of the coatings was analyzed by X-ray diffraction and revealed that the phase content was independent of the chamber pressure. The results indicate that the lowest thermal mismatch exists between the mullite/glass coating and the molybdenum substrate.
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