研究了Gd_2O_3质点及其添加量对涂层在空气中1100℃氧化行为的影响及作用机制。结果表明,NiAl涂层中加入Gd_2O_3质点后,极大地降低了涂层的氧化速率,显著提高了氧化膜的粘附性,比简单NiAl涂层具有更好的抗高温氧化性能。复合镀层经渗Al后,一部分Gd_2O_3质点仍弥散分布于涂层中,另一部分细小的亚微观质点在涂层/基体界面处富集,形成氧化物聚集带,聚集带具有扩散障作用。连续的聚集带更有效地抑制退化,提高涂层使用寿命。
Studies were made of the influences of the nature of Gd_2O_3 and itscontent on the oxidation behaviour in air at 1100℃ of the NiAl-type compositecoatings modified with dispersed Gd_2O_3, which were prepared by co-electrodeposi-tion and diffusion aluminizing techniques. In comparison with Gd_2O_3-free coatings,the oxidation of the modified coating may be remarkably retarded and their scalesadherence to substrate may be much improved. It was revealed that some Gd_2O_3 par-ticles are still dispersed in the coatings, but other sub-microscopical Gd_2O_3 particl-es are accumulated at the coating/substrate interface just after aluminizing. Theaccumulated layer is found as the diffusion barrier. A continuous Gd_2O_3 particlelayer would be more effective to reduce the degradation and to prolong the life ofthe coatings.
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