SiO_2/SiO_2陶瓷复合材料弯曲性能的研究  

STUDY ON THE FLEXURAL STRENGTH OF SiO_2/SiO_2 CERAMIC COMPOSITES

作　　者：周绍建[1,2] 廉云清[1,2] 杨杰[1,2] 肖春[1,2] 唐萍萍[1,2] 

机构地区：[1]西安航天复合材料研究所,西安710025 [2]高性能炭纤维制造及应用国家地方联合工程研究中心,西安710089

出　　处：《玻璃钢／复合材料》2014年第8期27-30,共4页Fiber Reinforced Plastics/Composites

摘　　要：以2.5D石英纤维编织体、硅溶胶等为原料,采用溶胶-凝胶的方法制备了SiO2/SiO2复合材料。研究了热处理温度、钝化工艺对SiO2/SiO2复合材料的弯曲性能的影响,并研究了材料在RT^1000℃的弯曲性能及其影响因素。试验证明,当热处理温度为650℃时,材料力学性能最佳;试样经钝化工艺处理后,材料弯曲强度提高17%;SiO2/SiO2复合材料的高温弯曲性能在600~800℃出现拐点,拐点与熔融态的二氧化硅自愈合有关,800℃以后,材料的弯曲性能下降。2.5D SiO2/SiO2composites were fabricated by sol-gel method using silica fiber and silica sol as the starting materials.The mechanical performance of the SiO2/SiO2 composites and the effect under different service temperature,passivation technics are studied.And the properties of SiO2/SiO2 composites and the effective factors are also studied.The results show that the composite achieves the best mechanical properties when the heat treatment temperature is 650℃.After the passivation technics,the flexural strength were increased by 17％.The results indicate that the SiO2/SiO2 composites had well heat-resistant.An inflexion point for high temperature bending property of SiO2/SiO2 composites is between 600 ～ 800℃,which is related to the self-union of molten condition SiO2.Whereas after 800℃,the bending property of SiO2/SiO2 composites decreased.

关 键 词：SIO2 SIO2复合材料 热处理温度 弯曲性能 

分 类 号：TB332[一般工业技术—材料科学与工程]