Self-propagating high temperature combustion synthesis of TiC/TiB2 ceramic–matrix composites
Self-propagating high temperature combustion synthesis of TiC/TiB2 ceramic–matrix composites
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DOI：
10.1016/s0266-3538(02)00155-0
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发表时间：
2002-11
影响因子：
9.1
通讯作者：
Zhang Xinghong;Zhu Chuncheng;Q. Wei;He Xiaodong;V. L. Kvanin
中科院分区：
文献类型：
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作者：
Zhang Xinghong;Zhu Chuncheng;Q. Wei;He Xiaodong;V. L. Kvanin
以Ti粉、B4 C粉和碳粉为原料，采用自蔓延高温燃烧合成结合准热等静压工艺制备了TiC/TiB 2陶瓷基复合材料。XRD和SEM分析结果表明，最终产物纯净，没有未反应的B4 C、Ti或碳出现。合成产物的显微组织由棒状TiB 2晶粒和等轴或不规则的TiC晶粒组成。通过实验确定了Ti：B_4C =3：1的最佳配比。当保温时间为5 s，保压时间为5 s，压力为160 MPa时，TiC-2 TiB 2陶瓷的相对密度、硬度、抗压强度和抗弯强度均达到最大值，高于TiC-TiB 2和2 TiC-TiB 2陶瓷。在TiC/TiB 2陶瓷中引入更多的棒状TiB 2晶粒，可显著提高TiC-2 TiB 2合成坯体的断裂韧性。
TiC/TiB2ceramic–matrix composites were produced by self-propagating high temperature combustion syntheses combined with pseudo hot isostatic pressing using Ti, B4C and carbon powder. The results of XRD and SEM analysis showed that the final product was pure and no unreacted B4C, Ti or carbon appeared. The microstructure of synthesized products consisted of the clubbed TiB2grains and equiaxed or irregular TiC grains. The optimal ratio with Ti:B4C=3:1 of the reactant powder was determined by experiments. The maximum relative density, hardness value, compression strength and bending strength was attained for TiC–2TiB2ceramic when the delay time is 5 s, keeping pressure time is 5 s and the pressure is 160 MPa, which is higher than TiC–TiB2and 2TiC–TiB2ceramics. The introduction of more clubbed TiB2grains into TiC/TiB2ceramics resulted in a drastic increase in the fracture toughness for TiC–2TiB2synthesized compacts.