NIOBIUM-BASED ALLOY HEAT RESISTANT MEMBER HAVING EXCELLENT OXIDATION RESISTANCE

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PROBLEM TO BE SOLVED : To provide a niobium-based alloy heat resistant member having excellent oxidation resistance by suppressing the peeling between a surface Al2O3 layer and an internal alloy and the progression of oxidation caused thereby. SOLUTION : In the niobium-based alloy heat resistant member comprising a first layer composed of an Re based alloy for preventing the diffusion between a niobium alloy base material and an oxidation preventive alloy layer, and a second layer composed of an Al based alloy for forming Al2O3 having excellent oxidation resistance on the surface, the problems of the peeling by the difference in the thermal expansion coefficients between the Al2O3 film and the internal alloy, and the progression of oxidation caused thereby are made remarkable in the superhigh temperature range of ≥1, 200°C at which its characteristics can be made the most of. For solving the problems, by adding a small amount of one or more selected from Hf and Zr to the second layer, the peeling can be remarkably suppressed, and thus the heat resistant member having excellent oxidation resistance in addition to heat resistance in a superhigh temperature range can be obtained. COPYRIGHT : (C)2006, JPO&NCIPI