文章信息/Info

Title:

Simulation Analysis on Residual Stress in Plasma Sprayed ZrB2�睟ased Coatings on C/C Composite

作者:

謝玲玲123; 陳文亮1; 牛亞然2; 鄭學斌2; 黃貞益3

(1. 南京航空航天大學機電學院，江蘇 南京 210016)  (2. 中國科學院上海硅酸鹽研究所 特種無機涂層重點實驗室，上海 200050)  (3. 安徽工業大學冶金工程學院，安徽 馬鞍山 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)

關鍵詞:

C/C復合材料; ZrB2基涂層; 等離子噴涂; 殘余應力; 數值模擬

Keywords:

C/C composite;  ZrB2�瞓ased coatings;  plasma spray;  residual stress;  numerical simulation

DOI:

10.7502/j.issn.1674-3962.2018.11.10

文獻標志碼:

A

摘要:

在C/C復合材料表面采用等離子噴涂ZrB2基陶瓷涂層是提高復合材料抗氧化性能的理想途徑。為有效防止熱裂紋的產生、設計性能更優的材料，基于數值模擬，通過合理的模型，采用間接順序熱結構耦合，可預測涂層在沉積過程中由于熱失配引起的宏觀殘余應力的大小和分布。結果表明，徑向應力是殘余應力的主要表現形式；較厚的粘結層能夠有效緩解材料的熱物性差異；涂層的厚度為0.5 mm時能夠保證涂層表面不會因為受壓而開裂的情況下在界面處的殘余應力較小；涂層體系的材質傾向于導熱系數較高、熱膨脹系數較低的ZrB2-30%SiC（體積分數）材料，以保證涂層在邊緣不會有太大的拉應力而產生翹曲。

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�瞫tructure 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�餿 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.