高温服役过程中热障涂层的MCrAlY粘结层形成致密的氧化铝层,从而提高了涂层和基体的抗氧化性能。利用等离子喷涂制备的热障涂层,其粘结层中的 Co 与 Ni 的含量和界面微观结构是影响氧化的重要因素。通过在Ni基高温合金基体上利用低压等离子喷涂(LPPS)分别制备粘结层为 CoNiCrAlY和 NiCoCrAlY的热障涂层进行高温循环氧化实验,比较研究了这两种热障涂层在1050℃下的循环氧化寿命和失效特征。研究表明粘结层表面形貌对氧化物的生长具有重要影响,其中CoNiCrAlY粘结层更易在TGO 层中形成尖晶石氧化物,最终无法形成连续的Al2 O3层,导致涂层失效,而NiCoCrAlY粘结层表现出不同的失效方式。同时,粘结层和基体中Ni、Co等元素在氧化过程中存在强烈的互扩散,Co与 Ni 含量对两种涂层 BC/基体界面处宏观空洞的生长产生了不同影响。
The dense alumina layer was generated on the surface of the MCrAlY bondcoats within thermal barri-er coatings (TBCs)at high temperature service process,which could improve the oxidation resistance of the coating and superalloy.The Co and Ni concentrations and interface micro-structure of the bondcoats were the important factors to affect the oxidation properties for the TBCs prepared by APS.In this paper,the high-tem-perature cycle oxidation experiment of TBCs specimens with CoNiCrAlY and NiCoCrAlY bondcoats was carried out at 1 050 ℃.The TBCs oxidation lifetime and failure characteristics were carefully studied.The results indi-cate that the spinels are easily formed within thermally growth oxide (TGO)for CoNiCrAlY bondcoat,which would cause TBC spallation due to a discontinuous Al2 O3 layer formation.In addition,the NiCoCrAlY bondcoat shows a different failure modes.Meanwhile,the strongly inter-diffusion phenomenon of Ni and Co within the bondcoat and Ni-base alloy matrix was observed during oxidation.The content of Co and Ni show different in-fluence on generation of macroscopic pores at the interface between bondcoats and the matrix.
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