C—SjC—TiC—TiB_2复合材料的原位合成及热压烧结  

IN-SITU SYNTHESIS AND HOT-PRESS SINTERING OF C-SiC-TiC-TiB_2 COMPOSITE

作　　者：黄启忠[1] 肖汉宁[2] 杨巧勤[2] 

机构地区：[1]粉末冶金国家重点实验室,长沙410083 [2]湖南大学,长沙410082

出　　处：《粉末冶金材料科学与工程》1998年第4期235-239,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金

摘　　要：以熟焦、炭纤维、B_4C、SiC、Si、TiO_2和TiC为原料、采用原位合成及热压技术研究了不同TiO_2和TiC含量对多组分碳/陶复合材料的组成、结构和性能的影响。在烧结过程中TiO_2或TiC与B_4C反应原位生成TiB_2,Si和TiO_2分别与C反应生成SiC和TiC,这些陶瓷相的生成对提高碳/陶复合材料的力学性能有显著作用。加入TiO_2比TiC能使碳/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430 MPa的碳/陶复合材料。Sintered petroleum coke, carbon fiber, B_4C,SiC,Si, TiO_2 and TiC were used as the starting materials for the preparation of multi-carbon/ceramic composite by hot pressing. The effects of the contents of TiO_2 and TiC on the compositions, mierostructure and propertics 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.

关 键 词：碳/陶复合材料 原位合成 热压烧结 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]