Microstructure and Thermal Shock Properties of CoCrAlSiY/YSZ Gradient Coatings by Double-powder-feeding Laser Cladding#br#

doi:10.3969/j.issn.1004-132X.2021.15.011

Abstract

Abstract: CoCrAlSiY/Y2O3-ZrO2（YSZ）gradient coatings were prepared on TC4 substrates by double-powder-feeding laser cladding. The microstructure， element distribution， microhardness and thermal shock properties of the CoCrAlSiY/YSZ gradient coatings were analyzed. The results show that the gradient coatings are firmly bonded to the substrates. There are no obvious interfaces between the gradient sublayers and cracks in the coatings， indicating that a good metallurgical bond is formed. The microhardness of the gradient coatings change progressively with the increase of YSZ contents. The thermal shock tests at 750 ℃ in different cycle periods show that the CoCrAlSiY/YSZ gradient coating have certain thermal shock resistance.

Key words: laser cladding, gradient coating, microhardness, thermal shock performance

摘要： 采用双送粉方式，利用激光熔覆技术在TC4基体上制备CoCrAlSiY/Y2O3-ZrO2（YSZ）梯度涂层。对CoCrAlSiY/YSZ梯度涂层的微观组织、元素分布、显微硬度及热振性能进行了分析与研究，结果表明：梯度涂层与基体结合紧密，各梯度亚层之间不存在明显的界面，梯度涂层无明显裂纹，形成了良好的冶金结合；随着YSZ含量的提高，梯度涂层显微硬度呈梯度变化。在750 ℃下进行了不同循环周期的热振试验，试验结果表明CoCrAlSiY/YSZ梯度涂层具有一定的抗热振性。

关键词: 激光熔覆, 梯度涂层, 显微硬度, 热振性能

CLC Number:

TG174.4

WANG Tao, ZHU Lei, TANG Jie, WANG Hao, WU Jun. Microstructure and Thermal Shock Properties of CoCrAlSiY/YSZ Gradient Coatings by Double-powder-feeding Laser Cladding#br#[J]. China Mechanical Engineering, 2021, 32(15): 1854-1860.

王涛, 朱磊, 唐杰, 王浩, 吴军. 双送粉激光熔覆CoCrAlSiY/YSZ梯度涂层微观组织及热振性能[J]. 中国机械工程, 2021, 32(15): 1854-1860.

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