Reactive synthesis for porous Ti3AlC2 ceramics through TiH2, Al and graphite powders

Reactive synthesis for porous Ti3AlC2 ceramics through TiH2, Al and graphite powders
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TiH2、Al 和石墨粉反应合成多孔 Ti3AlC2 陶瓷

DOI:
10.1016/j.ceramint.2013.11.136
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发表时间:
2014-06
影响因子:
5.2
通讯作者:
Yuehui He
Yuehui He
中科院分区:
材料科学1区
文献类型:
--
作者:
Junsheng Yang;Cuijiao Liao;Jiefeng Wang;Yao Jiang;Yuehui He

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采用反应合成法制备了多孔Ti 3AlC 2陶瓷。制备过程包括五个步骤:(i)硬脂酸在450 °C热解;(ii)TiH_2在700 °C分解,导致TiH_2转化为Ti;(iii)固体Ti和熔融Al在800-1000 °C的固-液化学反应,将混合物转化为Ti-Al化合物;(iv)新合成的Ti-Al化合物在1100-1200 °C与剩余的Ti和石墨反应生成三元碳化物和TiC;和(v)反应合成的三元碳化物和TiC,在1300 °C下产生多孔Ti 3AlC 2。烧结温度和Al含量对孔隙率的影响,研究了多孔Ti 3AlC 2陶瓷的孔径和透气性。结果表明,随着反应烧结温度的升高,多孔陶瓷的孔隙率和透气性有增大的趋势。对相变过程中的成孔机理进行了探讨。
Porous Ti3AlC2ceramics were fabricated by reactive synthesis. The process of fabrication involved five steps: (i) the pyrolysis of stearic acid at 450 °C; (ii) the decomposition of TiH2at 700 °C, which leads to the conversion of TiH2to Ti; (iii) the solid–liquid chemical reaction of solid Ti and molten Al at 800–1000 °C, which converts the mixture to Ti–Al compounds; (iv) the newly synthesized Ti–Al compounds that react with surplus Ti and graphite to form ternary carbides and TiC at 1100–1200 °C; and (v) reactive synthesized ternary carbides and TiC that yield porous Ti3AlC2at 1300 °C.The effects of sintering temperature and Al contents on porosity, pore size and permeability of porous Ti3AlC2ceramics were examined. The results revealed that the porosity and permeability tended to increase with reactive sintering temperature. The pore forming mechanism accompanying phase transformation was explored in this study.
DOI: 10.1007/bf02647559
发表时间: 1994-08
期刊: Journal of Phase Equilibria
影响因子: --
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