Pore Formation Process of Porous Ti3SiC2 Fabricated by Reactive Sintering.
Pore Formation Process of Porous Ti3SiC2 Fabricated by Reactive Sintering.
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反应烧结多孔Ti3SiC2的成孔过程
DOI：
10.3390/ma10020163
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发表时间：
2017-02-10
期刊：
影响因子：
--
通讯作者：
Jiang Y
中科院分区：
文献类型：
--
作者：
Zhang H;Liu X;Jiang Y
以氢化钛（TiH 2）、硅（Si）和石墨（C）为原料，通过反应烧结制备了纯度为99.4vol%的多孔Ti 3SiC 2。利用X射线衍射（XRD）和扫描电镜（SEM）对反应过程和烧结过程中孔结构的演变进行了系统的研究。结果表明，TiH 2/Si/C复合粉体合成Ti 3SiC 2的过程为：TiH 2分解为Ti，生成TiC和Ti 5Si 3中间相，TiC、Ti 5Si 3和Si反应生成Ti 3SiC 2。多孔Ti_3SiC_2陶瓷合成过程中形成的孔隙主要来源于以下几个方面：压制过程中残留的间隙孔隙; TiH_2分解形成的孔隙; Ti和Si与Ti和C粉末反应形成的孔隙;高温烧结过程中伴随终相合成而产生的孔隙。
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.