Influence of thermal shock behavior on microstructure and interface bonding strength of WC/W coating

2020 ◽  
Vol 393 ◽  
pp. 125787 ◽  
Author(s):  
Xueying Han ◽  
Yang Sun ◽  
Xinli Liu ◽  
Zhuangzhi Wu ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Bonding Strength ◽  
Interface Bonding ◽  
Thermal Shock Behavior ◽  
Interface Bonding Strength

Thermal Shock Behavior and Bonding Strength of MoSi2-BaO-Al2O3-SiO2 Gradient Porous Coating with Polymethyl Methacrylate Addition for Porous Fibrous Insulations

2018 ◽  
Vol 281 ◽  
pp. 493-498
Author(s):  
Ya Yu Su ◽  
Xiao Lei Li ◽  
Hui Jie Tang ◽  
Zhi Hao Zhao ◽  
Jian He
Keyword(s):  
Porous Structure ◽  
Thermal Shock ◽  
Bonding Strength ◽  
Thermal Shock Resistance ◽  
Porous Coating ◽  
Bonding Layer ◽  
Interface Bonding ◽  
Shock Resistance ◽  
Thermal Shock Behavior ◽  
Interface Bonding Strength

In order to improve the thermal shock behavior of high temperature resistant coating on porous fibrous referactory insulations, the MoSi2-BaO-Al2O3-SiO2(MoSi2-BAS) gradient porous coatings were designed by preparing a dense surface layer and a porous bonding layer with the method of brushing and subsequent sintering at 1773 K. The porous bonding layer was obtained by adding polymethyl methacrylate (PMMA) as pore former. As the content of PMMA increases, the MoSi2-BAS coatings changed from a dense structure into a gradient porous structure. The interface bonding strength and thermal shock resistance of the MoSi2-BAS coatings were investigated. The result shows that the as-prepared coating with gradient porous structure exhibited excellent thermal shock resistance, which remained gradient structure without cracking after thermal cycling 100 times between 1773 K and room temperature. And the interface bonding strength of the gradient porous coating reached 1.5±0.08 Mpa, which was much better than that of the dense coating.

scholarly journals Surface Optimization of ZrC–SiC Inner Layer to Enhance Ablation Property of SiC/ZrC–SiC Multi-Layer Coating for C/C Composites

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 378
Author(s):  
Anhong Shi ◽  
Xin Yang ◽  
Cunqian Fang ◽  
Yuanqi Weng ◽  
Xiao Luo ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Bonding Strength ◽  
Thermal Shock Resistance ◽  
Coefficient Of Thermal Expansion ◽  
Chemical Vapor ◽  
Vital Role ◽  
Porous Surface ◽  
Interface Bonding ◽  
Shock Resistance ◽  
Interface Bonding Strength

A ZrC–SiC inner layer was fabricated on carbon/carbon composites by pack cementation at different temperatures, aiming to prepare a transition layer for subsequent deposition of SiC and ZrC–SiC layer by chemical vapor deposition and plasma spray. Results show that the structure and phase composition of the inner layer significantly affected the interface bonding strength and thermal shock resistance of the multilayer, which played a vital role in resisting ablation. The jagged and porous surface of the inner layer led to forming a root-like pinning interface, generating a sawtooth combination between the layers. Moreover, the inner layer with high SiC content decreased the coefficient of thermal expansion mismatch between the inner and outer layers. Therefore, the enhanced ablation resistance of the optimum coating was attributed to the improved interface bonding strength and thermal shock resistance caused by the ZrC–SiC inner layer with rough and porous surface structure.

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