粘结层中Co与Ni元素含量对热障涂层组织及寿命的影响
发布时间：2018-07-21 18:11
【摘要】：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1 050℃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Al_2O_3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。
[Abstract]:During high temperature service, the MCrAlY bonding layer of the thermal barrier coating forms a dense alumina layer, which improves the oxidation resistance of the coating and the substrate. The content of Co and Ni in the bonding layer and the microstructure of interface are the important factors affecting the oxidation of the thermal barrier coating prepared by plasma spraying. The high temperature cycling oxidation experiments were carried out on Ni-based superalloy by using low pressure plasma spraying (LPPS) to prepare thermal barrier coatings with CoNiCrAlY and NiCoCrAlY, respectively. The cyclic oxidation life and failure characteristics of these two thermal barrier coatings at 1 050 鈩，
本文编号：2136360
[Abstract]:During high temperature service, the MCrAlY bonding layer of the thermal barrier coating forms a dense alumina layer, which improves the oxidation resistance of the coating and the substrate. The content of Co and Ni in the bonding layer and the microstructure of interface are the important factors affecting the oxidation of the thermal barrier coating prepared by plasma spraying. The high temperature cycling oxidation experiments were carried out on Ni-based superalloy by using low pressure plasma spraying (LPPS) to prepare thermal barrier coatings with CoNiCrAlY and NiCoCrAlY, respectively. The cyclic oxidation life and failure characteristics of these two thermal barrier coatings at 1 050 鈩，
本文编号：2136360
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