(1. 西北工業(yè)大學(xué) 超高溫結(jié)構(gòu)復(fù)合材料國(guó)防科技重點(diǎn)實(shí)驗(yàn)室,
西安 710072;
2. 南京理工大學(xué) 材料科學(xué)與工程系, 南京 210094)
摘 要: 利用等離子電弧風(fēng)洞燒蝕實(shí)驗(yàn)裝置模擬燃?xì)舛娴姆郗h(huán)境, 考核了碳/碳化硅（C/SiC）燃?xì)舛娴臒g性能, 探討了燃?xì)舛娴臒g機(jī)理, 采用平面薄板模型對(duì)燃?xì)舛娴目篃嵴鹦阅苓M(jìn)行了初步分析。 結(jié)果表明： 燃?xì)饬鞯牧鲃?dòng)方向與燃?xì)舛娑咧g的夾角對(duì)燃?xì)舛婢€燒蝕率的影響較大, 材料的線燒蝕率從前端沿氣流方向（垂直燃?xì)舛妫┑淖畲笾?.007 mm/s下降至厚度方向（平行于燃?xì)舛妫┑淖钚≈?.052 mm/s, 二者相差近20倍； 燃?xì)舛娴臒g機(jī)制主要是粒子侵蝕和機(jī)械剝蝕共同作用；同時(shí), 材料所受到的熱應(yīng)力是引起材料失效的主要原因。
關(guān)鍵字: C/SiC復(fù)合材料; 燃?xì)舛? 燒蝕; 抗熱震
CHENG Lai-fei1, ZHANG Li-tong1, XIONG Dang-sheng2
（1. National Key Laboratory of Thermostructure Composite Materials,
Northwestern Polytechnical University, Xi'an 710072, China；
2. Department of Material Science and Engineering,
Nanjing University of Science and Technology, Nanjing 210094, China）
Abstract: The ablation properties of C/SiC composites jet vane were evaluated using the plasma wind tunnel ablation equipment. The ablation mechanism of C/SiC composites was explored and the thermal shock-resistance of the jet vane was analyzed by plane flake board model. The results show that the angle between the plasma gas flowing direction and jet vane present great influence on the ablation of C/SiC composites. The linear ablation ratio of the composites decreases from the maximal value of 1.007 mm/s at the front direction of jet vane to the minimal value of 0.052 mm/s at the brim direction of the component. The difference value between these two ablation ratios is at a factor of about 20. The ablation mechanisms of components are particles erosion and mechanical denudation. Material failure is mainly caused by the thermal stress.
Key words: C/SiC composites; jet vane; ablation; thermal shock resistance
