Ablation mechanism of WC-SiC double layer coating under oxyacetylene torch test |
| |
Affiliation: | 1. Analysis and Testing Center, Donghua University, Shanghai 201620, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Shanghai 200050, PR China;3. Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics Chinese Academy of Sciences, Shanghai 200050, PR China |
| |
Abstract: | A WC-SiC double-layer coating was prepared on C/C composites to improve their anti-ablation property. The WC outer layer was designed to withstand high heat flux by its high mechanical strength, the SiC inner layer could transform into SiO2 to block oxygen by its good anti-oxygen permeability. During ablation process, amounts of SiO2 filled into the pores and cracks of WC outer layer, forming a steadily self-filling and cooling structure. As a result, the mass and linear ablation rates of WC-SiC coated C/C composites were 0.013 mg s?1 cm2 and ?1.61 µm/s, respectively. Compared with single SiC coated and single WC coated C/C composites, the linear ablation rates decreased by 46.3% and 27.3%, respectively, indicating that WC-SiC coating has a remarkable effect to resist chemical and mechanical ablation. |
| |
Keywords: | Tungsten carbide Silicon carbide Carbon/carbon composites Double-layer structure Ablation resistance |
本文献已被 ScienceDirect 等数据库收录! |
|