Hot-pressing Sintering of Double-A-layer MAX Phase Mo2Ga2C

JIN Sen1 WANG Zuo-Tong2 DU Ya-Qiong1 HU Qian-Ku1 YU Jian-Gong2 ZHOU Ai-Guo1

(1.School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, China 454000)
(2.School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, China 454003)

【Abstract】Mo2Ga2C, a double-A-layer MAX, is reported to be films or powders. This paper researched the sintering properties of M2Ga2C powders to make dense bulk samples by vacuum hot-pressing sintering. It was found that 750 °C was a suitable sintering temperature, while higher temperature (850 °C) resulted in decomposition of Mo2Ga2C yielding to main product of Mo2C. During sintering process at 750 °C, its grain size did not increase obviously with sintering time; meanwhile, the size of pores decreased markedly and the relative density increased significantly with the increasing sintering time. Additionally, the hot-pressed samples had obvious texture. Due to layering, some grains changed their orientations during sintering, of which most of the (00l) planes in the hot-pressed samples preferred to be perpendicular to the direction of hot-pressing sintering. Almost fully dense Mo2Ga2C bulk (relative density: 98.8%) was obtained by hot-pressing sintering at 750 °C for 8 h. This advantage of the method suggests that it can serve as promising preparation for Mo2Ga2C, a double-A-layer MAX.

【Keywords】 MAX phase; Mo2Ga2C; sintering; hot press;

【DOI】

【Funds】 National Natural Science Foundation of China (51772077) Project of Science and Technology Innovation Teams of Universities in Henan Province (19IRTSTHN027) Henan Provincial Natural Science Foundation (182300410228, 182300410275)

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(Translated by SUN Z)

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This Article

ISSN:1000-324X

CN: 31-1363/TQ

Vol 35, No. 01, Pages 41-45

January 2020

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Article Outline

Abstract

  • 1 Experimental method
  • 2 Results and discussion
  • 3 Conclusions
  • References