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WANG Yeliang, FU Zhengyi, WANG Hao, et al. STUDY ON THE STRUCTURE AND PROPERTIES OF TiB2-TiC MULTIPHASE CERAMICS[J]. Acta Materiae Compositae Sinica, 2003, 20(1): 22-26.
Citation: WANG Yeliang, FU Zhengyi, WANG Hao, et al. STUDY ON THE STRUCTURE AND PROPERTIES OF TiB2-TiC MULTIPHASE CERAMICS[J]. Acta Materiae Compositae Sinica, 2003, 20(1): 22-26.
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STUDY ON THE STRUCTURE AND PROPERTIES OF TiB2-TiC MULTIPHASE CERAMICS

  • State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070,China

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  • Received Date: August 07, 2001
  • Revised Date: December 19, 2001
    Abstract
  • By hot-pressing method, TiB2-TiC multiphase ceramics were fabricated from TiB2-TiC composites powders under the following sintering conditions: sintering temperature: 1700℃ and 1800℃, pressure: 30MPa, sintering time: 60min. The relative density, the hardness and fracture toughness of TiB2-TiC multiphase ceramic at room temperature were 99.8%, 93.2HRA and 5.53MPa·m1/2 respectively. The residual porosities and dislocation in sintered ceramics went against the performance. The microstructure of TiB2-TiC multiphase ceramics from composite powders had smaller and more symmetrical grains than the TiB2-TiC ceramics sintered from the mixtures of TiB2 and TiC powders. The elements of B, C and Ti at the interface of TiB2 and TiC were distributed gradually. There were no impurities at the interface and the bonds between phases were strong, which probably has relation to the higher properties of TiB 2-TiC multiphase ceramics. The growth of TiB2 in different crystal directions was different in TiB2-TiC multiphase ceramics.
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