Influence of the Content of B4C on Microstructure and Oxidation Resistance of Carbon/carbon Composites Modified by a Sol-gel/solvothermal Process

摘要：

　　In order to improve the oxidation resistance property of carbon/carbon composites,the C/C matrix was modified with a borate sol precursor and B4C micro-powders by a sol-gelsolvothermal process.The phase compositions,surface and cross-section microstructures of the C/C matrix modified by different B4C contents were particularly investigated.Results show that the surface of the modified composites is covered by a coating composed of B2O3 and B4C,meanwhile,the internal micro-holes of the C/C composites are occupied by B2O3 and B4C.After oxidation in air at 973 K,the B2O3 glassy phase due to the oxidation of B4C seals the cracks and holes and effectively prevents C/C composites from oxidation.The weight loss of the modified C/C composites is only 2.21% after oxidation in air at 973 K for 20 h.

关键词： Carbon/carbon composites Oxidation Solvothermal process Modification index

作者: Zhu Jia Huang Jian-feng Cao Li-yun Wu Jian-peng

作者单位: Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry,Ministry of Education,Shaanxi University of Science & Technology,Xian Shaanxi,710021,China

会议类型: 国际会议

会议名称: The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))

会议地点: 厦门

会议语种:英文

页码: 757-760

在线出版日期: 2011-11-04（万方平台首次上网日期，不代表论文的发表时间）