Grain growth limitation in the monolayer ZrB2-SiC coating above 1700 °C

被引：14

作者：

Hu, Dou ^{[1
]}

Fu, Qiangang ^{[1
]}

Zhou, Lei ^{[1
]}

Li, Xiaoxuan ^{[1
]}

Zhang, Jiaping ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Shaanxi Key Lab Fiber Reinforced Light Weight Com, Xian 710072, Shaanxi, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2022年 / 48卷 / 10期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

C/C composites; Laminated coating; Ablation; ZrB2-SiC; Grain growth; ABLATION RESISTANCE; COMPOSITES; OXIDATION;

D O I：

10.1016/j.ceramint.2022.02.014

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The cracking behavior along the interface (surface ZrO2 layer and unoxidized ZrB2-SiC layer) in the thermally sprayed ZrB2-SiC coating above 1700 degrees C was investigated by cyclic ablation tests (2.4 MW/m(2)). Experiment and simulation results show that the rapid growth of surface ZrO2 grains will greatly promote the interfacial micropores development until the formation of inter-laminar cracks. To address this issue, the laminated ZrB2-SiC/ZrO2 coating was prepared. The ZrO2 interface layer effectively restrained surface ZrO2 grain growth and improved the structural integrity by hindering the diffusion of liquid B2O3 and SiO2 towards the surface. Compared with monolayer ZrB2-SiC coating (-0.17 mg/s and -8.13 mu m/s), the mass and linear variation rates of the laminated coating decreased by 35% and 60%, respectively.

引用

页码：14767 / 14777

页数：11

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