Pressureless Sintering and Reaction Mechanisms of Ti3SiC2 Ceramics
Pressureless Sintering and Reaction Mechanisms of Ti3SiC2 Ceramics
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DOI：
10.1111/jace.12903
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发表时间：
2014-05
影响因子：
3.9
通讯作者：
Kimitoshi Sato;Mrinalini Mishra;Hiroto Hirano;Chunfeng Hu;Y. Sakka
中科院分区：
文献类型：
--
作者：
Kimitoshi Sato;Mrinalini Mishra;Hiroto Hirano;Chunfeng Hu;Y. Sakka
以摩尔比为1.0 Ti、0.3 Al、1.2 Si、2.0 TiC的粉末混合物为原料，在流动的氩气中加热1200℃，合成了易烧结的Ti3SiC2粉末。其中，Al粉末作为脱氧剂，为反应提供了液相。在氩气中进行1300℃无压烧结，粉末压坯的相对密度可达99%。化学分析结果和测量的晶格常数表明，Al - Si液相在1200℃左右形成，过量的0.1摩尔比Al和0.2摩尔比Si促进了液相烧结。烧结试样的三点抗弯强度为380 MPa，断裂韧性为4.1 MPa m1/2，电阻率为0.34μΩm。
Easy sinterable Ti3SiC2 powder was synthesized from a powder mixture with a molar ratio of 1.0 Ti, 0.3 Al, 1.2 Si, and 2.0 TiC by heating at 1200°C in the flowing Ar. Here, the Al powder acts as a deoxidation agent and provides a liquid phase for the reaction. The powder compacts subjected to pressureless sintering at 1300°C in Ar had a relative density up to 99%. The results of chemical analysis and the measured lattice constant suggest that the Al–Si liquid phase was formed at approximately 1200°C and that liquid-phase sintering was promoted by the 0.1 molar ratio of Al and the 0.2 molar ratio of Si remaining in excess. The three-point bending strength, fracture toughness, and electrical resistivity of the sintered samples were 380 MPa, 4.1 MPa m1/2, and 0.34μΩm, respectively.