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

doi:10.15541/jim20190296

Abstract

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. It was found that 750 ℃ was a suitable sintering temperature, while higher temperature (850 ℃) resulted in decomposition of Mo₂Ga₂C yielding to main product of Mo₂C. During sintering process at 750 ℃, 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 press. Almost fully densed Mo₂Ga₂C bulk (relative density: 98.8%) was obtained by hot pressing at 750 ℃ for 8 h. This advantage of the method suggested that it can serve as a promising preparation for Mo₂Ga₂C, a double-A-Layer MAX.

Key words: MAX phase, Mo₂Ga₂C, sintering, hot press

CLC Number:

TG174

JIN Sen, WANG Zuo-Tong, DU Ya-Qiong, HU Qian-Ku, YU Jian-Gong, ZHOU Ai-Guo. Hot-pressing Sintering of Double-A-layer MAX Phase Mo₂Ga₂C[J]. Journal of Inorganic Materials, 2020, 35(1): 41-45.

Figures/Tables 6

Fig. 1 XRD patterns of samples sintered at different temperatures

Fig. 2 Photo of the sample sintered at 850 ℃ for 2 h, in which the glittering particles on samples surface marked by red cycles are precipitated Ga

Table 1 Effect of sintering time on sample density and relative density

Sintering time/h	Density/(g?cm^-3)	Relative density/%
2	5.44	68.8
4	6.69	84.6
6	7.28	92.0
8	7.81	98.8

Fig. 3 (a) XRD patterns of hot-pressed Mo2Ga2C samples with different sintering time, and (b) intensity ratios of (008) peak and (103) peak

Fig. 4 Low and high magnification SEM images of Mo2Ga2C powders

Fig. 5 (a-d) SEM images of samples sintered at 750 ℃ for 2, 4, 6 and 8 h, (e) high-magnification image of (d), and (f) SEM image of sample sintered at 850 ℃ for 2 h

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

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