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Oxidation resistance coatings of Ire40 at.% Zr and Ir were produced onto Mo substrates by double glow plasma technology. The oxidation resistances of the coatings were evaluated at high temperature. Ire Zr coating consisted of two layers: the primary layer close to the substrate was composed of dense columnar grains and the second layer was composed of dense grains of nanometric size. The mass gain of Ir coating above 800 C was about 1.35% due to the formation of solid IrO2. The mass loss of Ir coating was about 5.3% due to the formation of gaseous oxide IrO3when being held at 1227 C for 30 min. The substrate was protected more effectively by multilayer than monolayer coating of Ir in oxidizing environment. The Ire Zr coating was well bonded to the substrate after oxidation at 800 C. After oxidation at 1000 C, the Ire Zr coating was poorly bonded to the substrate. The oxidation resistance of Ire Zr coating was poor due to high content of Zr.
Oxidation resistance coatings of Ire40 at.% Zr and Ir were produced onto Mo substrates by double glow plasma technology. The oxidation resistances of the coatings were evaluated at high temperature. Ire Zr coating consisted of two layers: the primary layer close to the substrate was composed of dense columnar grains and the second layer was composed of dense grains of nanometric size. The mass gain of Ir coating above 800 C was about 1.35% due to the formation of solid IrO2. The mass loss of Ir coating was about 5.3% due The formation was coated with a gaseous oxide IrO3 being kept at 1227 C for 30 min. The substrate was protected more effectively by multilayer than monolayer coating of Ir in oxidizing environment. The Ire Zr coating was well bonded to the substrate after oxidation at 800 C. After oxidation at 1000 C, the Ire Zr coating was poorly bonded to the substrate. The oxidation resistance of Ire Zr coating was poor due to high content of Zr.