C/C复合材料表面等离子喷涂ZrB2基涂层沉积残余应力仿真分析-中国材料进展

文章信息/Info

Title:: Simulation Analysis on Residual Stress in Plasma Sprayed ZrB2Based Coatings on C/C Composite

作者:: 谢玲玲123; 陈文亮1; 牛亚然2; 郑学斌2; 黄贞益3; (1. 南京航空航天大学机电学院，江苏南京 210016) (2. 中国科学院上海硅酸盐研究所特种无机涂层重点实验室，上海 200050) (3. 安徽工业大学冶金工程学院，安徽马鞍山 243002)

Author(s):: XIE Lingling1; 2; 3; CHEN Wenliang1; NIU Yaran2; ZHENG Xuebin2; HUANG Zhenyi3; (1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China) (2. Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics,Chinese Academy of Sciences, Shanghai 200050, China) (3. Metallurgical Engineering College, Anhui University of Technology, Maanshan 243002, China)

Keywords:: C/C composite; ZrB2based coatings; plasma spray; residual stress; numerical simulation

摘要:: 在C/C复合材料表面采用等离子喷涂ZrB2基陶瓷涂层是提高复合材料抗氧化性能的理想途径。为有效防止热裂纹的产生、设计性能更优的材料，基于数值模拟，通过合理的模型，采用间接顺序热结构耦合，可预测涂层在沉积过程中由于热失配引起的宏观残余应力的大小和分布。结果表明，径向应力是残余应力的主要表现形式；较厚的粘结层能够有效缓解材料的热物性差异；涂层的厚度为0.5 mm时能够保证涂层表面不会因为受压而开裂的情况下在界面处的残余应力较小；涂层体系的材质倾向于导热系数较高、热膨胀系数较低的ZrB2-30%SiC（体积分数）材料，以保证涂层在边缘不会有太大的拉应力而产生翘曲。

Abstract:: It is an ideal way to improve the performance of composite antioxidant by plasma spraying ZrB2-based ceramic coatings on C/C composite. To effectively prevent the formation of hot crack and design the materials with better performance, through the reasonable modeling, numerical simulation was used to forecast the size and distribution of macroscopic residual stress of the coating caused by thermal mismatch during the spray deposition by employing indirect sequence thermalstructure coupling. The effect of ZrB2-SiC ceramic coating thickness，SiC bond coating thickness and material composition on residual thermal stress was comparatively analyzed. The results showed that radial stress was the major form of residual stress. Thicker bonding layer could effectively alleviate the difference of thermal properties of materials. When the thickness of the coating was 0.5 mm, it could ensure that the residual stress at the interface of the coating surface wouldnt be small when it was fractured due to pressure. The material of the coating system tended to be ZrB2-30vol% SiC material with higher thermal conductivity and lower thermal expansion coefficient, which could ensure that the coating wouldn‘t warp due to too much tensile stress at the edge.