| 摘要 |
A molybdenum article is disclosed in which the substrate thereof has adherently bonded thereto a thermally self-healing plasma-sprayed coating consisting essentially of a composite of molybdenum and a refractory oxide material capable of reacting with molybdenum oxide under oxidizing conditions to form a substantially thermally stable refractory compound of molybdenum. The plasma-sprayed coating is formed of a plurality of interbonded plasma-sprayed layers of a composite of molybdenum/refractory oxide material produced from a particulate mixture thereof. The coating comprises a first layer of molybdenum plasma-sprayed bonded to the substrate of said molybdenum element and a second layer of plasma-sprayed mixture of particulate molybdenum/refractory oxide consisting essentially of predominantly molybdenum bonded to the first layer. The succeeding layers of the molybdenum/refractory oxide mixture provide from layer to layer a descending concentration gradient of molybdenum and a corresponding ascending concentration gradient of refractory oxide material. The concentration gradient continues to an N-1 layer in which the refractory oxide concentration of the mixture predominates and terminates at the Nth layer, the Nth layer consisting essentially of the refractory oxide material plasma-sprayed bonded to the N-1 layer.
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