C/C-ZrC复合材料抗烧蚀性能研究

本文采用微波水热技术在碳纤维预制体中原位合成ZrO2,经热梯度化学气相渗透致密化和高温石墨化处理,制备了C/C-ZrC复合材料.利用氧乙炔焰测试C/C-ZrC复合材料的抗烧蚀性能,研究了ZrC含量对复合材料抗烧蚀性能的影响规律;借助XRD、SEM等测试手段分析复合材料烧蚀前后的物相及微观结构.研究结果表明：C/C复合材料内的ZrO2经碳热还原反应后转变为亚微米级ZrC颗粒,可弥散分布在基体碳中.当ZrC含量为7.33wt%时,复合材料呈现出最低的烧蚀率,相比C/C复合材料,线烧蚀率和质量烧蚀率分别降低了27.1%和37.9%.当ZrC含量为8.92wt%时,复合材料中裂纹的增加是烧蚀性能降低的...

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Published in陕西科技大学学报：自然科学版 Vol. 35; no. 5; pp. 60 - 65
Main Author 李翠艳 畅丽媛 曹丽云 费杰 孔新刚
Format Journal Article
LanguageChinese
Published 2015
Subjects
C/C复合材料
ZrC
微波水热
烧蚀性能
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Summary:本文采用微波水热技术在碳纤维预制体中原位合成ZrO2,经热梯度化学气相渗透致密化和高温石墨化处理,制备了C/C-ZrC复合材料.利用氧乙炔焰测试C/C-ZrC复合材料的抗烧蚀性能,研究了ZrC含量对复合材料抗烧蚀性能的影响规律;借助XRD、SEM等测试手段分析复合材料烧蚀前后的物相及微观结构.研究结果表明：C/C复合材料内的ZrO2经碳热还原反应后转变为亚微米级ZrC颗粒,可弥散分布在基体碳中.当ZrC含量为7.33wt%时,复合材料呈现出最低的烧蚀率,相比C/C复合材料,线烧蚀率和质量烧蚀率分别降低了27.1%和37.9%.当ZrC含量为8.92wt%时,复合材料中裂纹的增加是烧蚀性能降低的主要原因.裂纹不仅提供了氧扩散通道加速碳的氧化,而且裂纹的增加降低了复合材料的导热系数,使复合材料在烧蚀过程具有较高的表面温度以加速复合材料的烧蚀。
Bibliography:C/C composites;microwave-hydrothermal;ZrC;ablation
61-1080/TS
LI Cui-yan, CHANG Li-yuan, CAO Li-yun, FEI Jie, KONG Xin-gang （School of Materials Science and Engineering, Shaanxi University of Science ＆ Technology, Xi＇ an 710021, China）
The C/C‐ZrC composites were prepared by the following process .First ,zirconia was introduced into the carbon fiber preforms by a microwave‐hydrothermal reaction .And then , the C/C‐ZrC composites were desified by thermal gradient chemical vapor infiltration .The ablation property of the composites was performed with an oxyacetylene torch .The effect of the addition of ZrC on the ablation resistance of the composites was studied .The phase and microstructure of the composites were analyzed by XRD and SEM .Results show that the ZrO2 in the composites was fully converted into submicrometer ZrC by a carbothermal reduc‐tion reaction of ZrO2 with pyrocarbon .The ZrC grain is uniformly embedded in the carbon matrix .The C/C composites containing 7 .33 wt% ZrC exhibit the best ablation r
ISSN:1000-5811