C-B4C-SiC与Ti组分的原位反应及热压烧结

以炭黑、炭纤维、Ｂ４Ｃ、ＳｉＣ、Ｓｉ、ＴｉＯ２和ＴｉＣ为原料制备了不同ＴｉＯ２和ＴｉＣ含量的炭／陶复合材料，采用原位合成及热压技术研究了不同ＴｉＯ２和ＴｉＣ含量对多组分炭／陶复合材料的组成、结构和性能的影响。在烧结过程中ＴｉＯ２和ＴｉＣ与Ｂ４Ｃ反应原位生成ＴｉＢ２，Ｓｉ和ＴｉＯ２分别与Ｃ反应生成ＳｉＣ和ＴｉＣ，这些陶瓷相的生成对提高炭／陶复合材料的力学性能有显著作用。加入ＴｉＯ２能使炭／陶复合材料在较低的温度下实现致密化烧结，获得了抗弯强度达４３０ＭＰａ的炭／陶复合材料

IN SITU REACTION AND HOT-COMPRESS SINTER OF COMPONENTS OF C-B4C-SiC AND Ti

Carbon/ceramic composite with various contents of TiO 2 and TiC were prepared from carbon black,carbon fiber,B 4C,SiC,Si,TiO 2 and TiC.The effects of various contents of TiO 2 and TiC on the composition,structure and mechanical properties of multi-components carbon/ceramic composite were studied by in situ synthesis and hot-compress technology.During sintering process TiO 2 and TiC react with B 4C to generate TiB 2 in situ, Si and TiO 2 react with C to generate SiC and TiC respectively,and the formation of these ceramic phase has improved significantly the mechanical properties of carbon/ceramic composite.Carbon/ceramic composite with additive TiO 2 can sinter compactively at low temperature and its bending strength reaches 430 MPa.