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研究了γ′-Co3(Al,W)相沉淀强化的新型钴基高温合金,Co-Al-W抗高温氧化性能。利用SEM、EPMA、XRD等方法研究了新型Co-Al-W合金在800℃和900℃空气中静态氧化增重动力学和抗高温氧化机理,并与镍基高温合金Manaurite900相比较。研究发现,在800℃氧化时,9.8W合金抗氧化能力最强,但在900℃时,9.8W和7.5W合金的增重最大,Manaurite900和10.7W的抗氧化能力最好。合金在2种温度下氧化后,表面氧化膜主要由三层构成,即Co氧化物Co3O4组成的氧化膜最外层,Co、Al、W复杂氧化物组成的中间过渡层及Al和Co氧化物组成的氧化膜最内层。
A new type of cobalt-based superalloy was precipitated and strengthened by γ’-Co3 (Al, W) phase. The oxidation resistance of Co-Al-W at high temperature was studied. The kinetics of the static oxidation kinetics and the mechanism of high temperature oxidation of the novel Co-Al-W alloy in air at 800 ℃ and 900 ℃ were studied by means of SEM, EPMA and XRD, and compared with Manaurite900 nickel-based superalloy. The results show that 9.8W alloy has the strongest oxidation resistance at 800 ℃, but 9.8W and 7.5W alloy have the highest weight gain at 900 ℃, and Manaurite900 and 10.7W have the best oxidation resistance. After the alloy is oxidized at two temperatures, the surface oxide film is mainly composed of three layers, that is, the outermost oxide film composed of Co oxide Co3O4, the intermediate transition layer composed of a complex oxide of Co, Al and W, and the Al and Co oxides Composition of the oxide film innermost layer.