C—SiC—TiC—TiB2复合材料原位合成及热压烧结

以熟焦，碳纤维，Ｂ４Ｃ，ＳｉＣ，Ｓｉ，ＴｉＯ２和ＴｉＣ为原料，采用原位合成及热压技术研究了不同ＴｉＯ２和ＴｉＣ含量对多组份碳／陶复合材料的组成、结构和性能的影响。

In Situ Synthesis and Hot Press Sintering of C SiC TiC TiB 2 Composite

Sintered petroleum coke,carbon fiber,B 4C,SiC Si,TiO 2 and TiC were used for the preparation of multi carbon/ceramic composite by hot pressing.The effects of the contents of TiO 2 and TiC on the compositions,microstructure and properties of C SiC TiC TiB 2 composite were investigated.In situ synthesis of TiB 2 by the reaction between TiO 2 or TiC and B 4C occurred during the sintering process,also SiC and TiC formed by the reaction between Si or TiO 2 and C.The formation of these ceramic phases has evident improvement on the mechanical properties of the composite.The addition of TiO 2 can make the material densification at lower temperature than that of TiC.The hot pressed composite with the addition of TiO 2 revealed superior mechanical properties.A carbon/ceramic composite with a strength of 430 MPa was prepared.