Absence of the core-rim microstructure in Ti_xTa_{1 鈭?#xa0;x}C_yN_{1 鈭?#xa0;y}-based cermets developed from a pre-sintered carbonitride master alloy

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• 作者：E. Chicardi ; ^{ernesto.chicardi@icmse.csic.es} ; J.M. Có ; rdoba ; M.J. Sayagué ; s ; F.J. Gotor
• 关键词：Ceramic-matrix composite ; Titanium carbonitride ; Mechanosynthesis ; Microstructure ; Cermets
• 刊名：International Journal of Refractory Metals and Hard Materials
• 出版年：2012
• 期刊代码：91_02634368
• 类别：et
• 出版时间：July, 2012
• 卷：33
• 期：Complete
• 页码：38-43
• 文件大小：2098 K

摘要

(Ti,Ta)(C,N) solid solution-based cermets with cobalt as the binder phase were synthesised by a two-step milling process. The titanium-tantalum carbonitride solid solution (the ceramic phase) was obtained via a mechanically induced self-sustaining reaction (MSR) process from stoichiometric elemental Ti, Ta, and graphite powder blends in a nitrogen atmosphere. Elemental Co (the binder phase) was added to the ceramic phase, and the mixture was homogenised by mechanical milling (MM). The powdered cermet was then sintered in a tubular furnace at temperatures ranging from 1400 掳C to 1600 掳C in an inert atmosphere. The chemical composition and microstructure of the sintered cermets were characterised as ceramic particles grown via a coalescence process and embedded in a complex (Ti,Ta)-Co intermetallic matrix. The absence of the typical core-rim microstructure was confirmed.