Microstructure and interface-adhesion of thermally sprayed continuous gradient elastic modulus FeCrAl-ceramic coatings
Microstructure and interface-adhesion of thermally sprayed continuous gradient elastic modulus FeCrAl-ceramic coatings
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DOI：
10.1016/j.ceramint.2019.11.048
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发表时间：
2020-04
影响因子：
5.2
通讯作者：
Qiaolei Li;C. Deng;Lu Li;Jianguo Lü;P. Song;Chao Li;Mingjun Wang;Chunjian Wang;Biju Zheng;Jiansheng Lu
中科院分区：
文献类型：
--
作者：
Qiaolei Li;C. Deng;Lu Li;Jianguo Lü;P. Song;Chao Li;Mingjun Wang;Chunjian Wang;Biju Zheng;Jiansheng Lu
热喷涂金属结合层与陶瓷面层之间的结合强度是决定其使用寿命的关键因素。然而，大多数研究都集中在界面修饰上。在电弧喷涂制备FeCrAl粘结层的基础上，采用等离子喷涂制备了Al 2 O3 - 40wt%TiO2面层，并在低氧气氛中进行了热处理。成功制备了弹性模量连续梯度的FeCrAl陶瓷涂层，并系统研究了涂层从基体到表层的组织和力学性能。涂层中Al 2 O3含量从表层到基体逐渐降低，形成连续梯度弹性模量的FeCrAl-陶瓷涂层。热处理过程中生成的氧化物填充了粘结层中的缺陷，大大提高了涂层的力学性能。连续梯度弹性模量涂层的结合强度比原样涂层的结合强度大21.7%。
The bond strength between thermally sprayed metal bond-coats and ceramic top-coats is a key factor in determining their service life. However, most studies focus on interface modifications. In this research, based on FeCrAl bond-coats prepared by arc spraying, top-coats (Al2O3-40 wt% TiO2) were prepared by plasma spraying, and heat treatment was carried out in a hypoxic atmosphere. Continuous gradient elastic modulus FeCrAl-ceramic coatings were successfully prepared, and the microstructural and mechanical properties from the substrate to the top-coats were systematically investigated. The Al2O3content gradually decreased from the top-coats to the substrate, forming continuous gradient elastic modulus FeCrAl-ceramic coatings. The oxide formed during the heat treatment filled the defects in the bond-coats and greatly improved the mechanical properties of the coating. The bonding strength of the continuous gradient elastic modulus coating was 21.7% greater than that of the as-received coating.