ZrB2改性C/C复合材料微观结构及烧蚀性能的研究(英文)  

Microstructure and Ablation Behavior of C/C Composites Doped with ZrB_2

作　　者：孙慧慧[1] 李贺军[1] 沈学涛[1] 曹高翔[1] 强新发[1] 任晓斌[1] 付前刚[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《无机材料学报》2011年第6期669-672,共4页Journal of Inorganic Materials

基　　金：National Natural Science Foundation of China(50832004,90716024);the “111” Project(08040)

摘　　要：采用超声波真空浸渍-碳热还原法将ZrB2引入碳纤维预置体,结合热梯度化学气相渗透、高温石墨化工艺制备了ZrB2改性C/C复合材料.氧-乙炔烧蚀测试结果表明,添加了6.87 wt%ZrB2后,C/C复合材料的线烧蚀率和质量烧蚀率分别下降了64.9%和67.5%.分析表明,C/C复合材料的烧蚀主要是由热化学和热物理反应控制,机械剥蚀在烧蚀过程中仅起到次要作用.烧蚀产物ZrO2/B2O3在烧蚀过程中的挥发会带走大量的热,从而减少了烧蚀火焰对烧蚀表面的热冲击.ZrB2 was first introduced into carbon preforms through ultrasonic and vacuum immersion-carbonthermal reduction method.After densification using thermal gradient chemical vapor infiltration and graphitization,ZrB2 doped C/C composites were prepared.The oxyacetylene ablation results show that the linear and mass ablation rates of the composites after doping with 6.87wt% ZrB2 decreased by 64.9% and 67.5%,respectively.The ablation of C/C com-posites is mainly controlled by thermochemical and thermophysical reactions and mechanical denudation does not play a dominant role.The evaporation of ZrO2/B2O3 during ablation would take away large amounts of heat,reducing the thermal impact of flame to the ablation surface.

关 键 词：烧蚀 ZRB2 C/C复合材料 ZRO2 

分 类 号：TB332[一般工业技术—材料科学与工程]