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.
出处
《粉末冶金材料科学与工程》
EI
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
关键词
碳/陶复合材料
原位合成
热压烧结
力学性能
carbon/ceramic composite
in-situ synthesis
hot-press sintering
mechanical property
