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Self-propagation High-temperature Synthesis of Porous TiB2-TiC Multiphase Ceramics
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School of Chemical engineering and Technology,China University of Mining and Technology,School of Material Science and Engineering,China University of Mining and Technology,School of Material Science and Engineering,China University of Mining and Technology,School of Material Science and Engineering,China University of Mining and Technology

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    Abstract:

    Porous TiB2-TiC multiphase ceramics were prepared by Self-propagation High-temperature Synthesis (SHS) and the reactant mole ratios of Ti:B4C were 3:1, 3.5:1 and 4:1. The combustion characteristics, phase composition, microstructure,porosity and oxidation resistance of the products were investigated. The results show that the highest combustion temperature is 2458 K and the combustion products are mainly composed of TiB2 and TiC. The open porosity of the porous products are within the range of 30.67%~31.19% and TiB2-TiC multiphase ceramics possess good high temperature oxidation resistance at 923 K in air. The main pore formation mechanism includes the residual pores among the particles of the green powder compacts, and the in-situ pores owing to the molten titanium particles flowing during the combustion synthesis reaction. The large pores are formed by the interstitial hole combining with the in-situ pores, and the small pores are formed during the solution-precipitation process.

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[Liu Yanan, He Zhimin, Feng Peizhong, Sun Zhi. Self-propagation High-temperature Synthesis of Porous TiB2-TiC Multiphase Ceramics[J]. Rare Metal Materials and Engineering,2018,47(S1):217~221.]
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History
  • Received:June 20,2017
  • Revised:July 30,2018
  • Adopted:March 07,2018
  • Online: October 22,2018

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