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本文采用化学气相沉积的工艺方法在钴基高温合金上制备了铝化物涂层,研究了所得典型铝化物涂层在静态空气中的高温氧化动力学规律。用XRD、SEM、EDS等方法分析了DZ40M铝化物涂层的组织结构及氧化产物的演变变化,DZ40M高温合金扩散型铝化物涂层在1050℃条件下氧化主要生成α-Al2O3保护膜,提高了DZ40M合金的抗氧化性能。经1050℃静态氧化150 h后,大量CoAl相转化为α-Co相,到500 h时CoAl涂层消失殆尽。
In this paper, the chemical vapor deposition process was used to prepare aluminide coatings on cobalt-based superalloy. The oxidation kinetics of the typical aluminide coating in static air at high temperature was studied. The microstructure and the evolution of oxidation products of DZ40M aluminide coating were analyzed by XRD, SEM and EDS. The DZ40M high temperature alloy diffusion aluminide coating mainly produced α-Al2O3 protective film when oxidized at 1050 ℃, DZ40M alloy oxidation resistance. After static oxidation at 1050 ℃ for 150 h, a large amount of CoAl phase was transformed into α-Co phase, and the CoAl coating disappeared after 500 h.