Pore Formation Process of Porous Ti₃SiC₂ Fabricated by Reactive Sintering

Author： Zhang Huibin Liu Xinli Jiang Yao

Publisher： MDPI

E-ISSN： 1996-1944|10|2|163-163

ISSN： 1996-1944

Source： Materials, Vol.10, Iss.2, 2017-02, pp. : 163-163

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Abstract

Porous Ti₃SiC₂ was fabricated with high purity, 99.4 vol %, through reactive sintering of titanium hydride (TiH₂), silicon (Si) and graphite (C) elemental powders. The reaction procedures and the pore structure evolution during the sintering process were systematically studied by X-ray diffraction (XRD) and scanning electron microscope (SEM). Our results show that the formation of Ti₃SiC₂ from TiH₂/Si/C powders experienced the following steps: firstly, TiH₂ decomposed into Ti; secondly, TiC and Ti₅Si₃ intermediate phases were generated; finally, Ti₃SiC₂ was produced through the reaction of TiC, Ti₅Si₃ and Si. The pores formed in the synthesis procedure of porous Ti₃SiC₂ ceramics are derived from the following aspects: interstitial pores left during the pressing procedure; pores formed because of the TiH₂ decomposition; pores formed through the reactions between Ti and Si and Ti and C powders; and the pores produced accompanying the final phase synthesized during the high temperature sintering process.