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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。
The composition, structure and properties of multi-component carbon / ceramic composites with different contents of TiO_2 and TiC were investigated by in-situ synthesis and hot pressing technology using raw coke, carbon fiber, B_4C, SiC, Si, TiO_2 and TiC as raw materials influences. During sintering, TiO 2 or TiC reacts with B 4 C to produce TiB 2 in situ, and Si and TiO 2 respectively react with C to form SiC and TiC. The formation of these ceramic phases has a significant effect on improving the mechanical properties of the carbon / ceramic composite. The addition of TiO_2 to TiC can make the carbon / ceramic composites densified and sintered at a lower temperature, and the carbon / ceramic composites with a bending strength up to 430 MPa were obtained.