Discussion on structural parameters of the multilayer ZrC/TaC coatings based on stress analysis and ablation behaviors
Hu, Dou 1Fu, Qiangang 1Li, Xiaoxuan 1Zhou, Lei 1Zhang, Jiaping1
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作者信息
1. Northwestern Polytech Univ
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Abstract
The multilayer ZrC/TaC ablation resistant coatings with different layers were designed and fabricated on the SiC coated carbon/carbon composites by plasma spraying. Based on stress distribution and ablation performance under heat flux of 2.4 MW/m(2), structural parameters of the multilayer ZrC/TaC coatings (total thickness d, number of layers n and thickness ratio R) were discussed and optimized. When R was equal to 1 and d was -300 mu m, the multilayer ZrC/TaC coating with three layers (n = 3) exhibited moderate stress distribution and the best ablation resistance, induced by the ZrC anti-scouring layer with sufficient thickness and effective crack deflection at the interface. The optimized structural parameters for multilayer ZrC/TaC system are considered as follows: (i) the larger d value was beneficial to reducing the residual thermal stress during ablation process; (ii) d/n for the ZrC layer was between 100-150 mu m, while d/n for the TaC layer was between 40-100 mu m.
NSTL
Elsevier