双A层MAX相Mo2Ga2C的热压烧结研究

doi:10.15541/jim20190296

无机材料学报 ›› 2020, Vol. 35 ›› Issue (1): 41-45.DOI: 10.15541/jim20190296

所属专题： MAX相和MXene材料；结构陶瓷论文精选(2020)；优秀作者论文集锦；【虚拟专辑】层状MAX，MXene及其他二维材料

双A层MAX相Mo₂Ga₂C的热压烧结研究

金森¹,王作通²,杜亚琼¹,胡前库¹,禹建功²,周爱国¹()

^1. 河南理工大学材料科学与工程学院, 焦作 454003
^2. 河南理工大学机械与动力工程学院, 焦作 454003

收稿日期:2019-06-19 修回日期:2019-07-08 出版日期:2020-01-20 网络出版日期:2019-10-25
作者简介:金森(1988-), 男, 硕士研究生. E-mail:jsjsjinsen@126.com
基金资助:
国家自然科学基金(51772077);河南省高校科技创新团队(19IRTSTHN027);河南省自然科学基金(182300410228);河南省自然科学基金(182300410275)

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 454000, China
^2. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Received:2019-06-19 Revised:2019-07-08 Published:2020-01-20 Online:2019-10-25
About author:JIN Sen(1988-), male, Master candidate. E-mail:jsjsjinsen@126.com
Supported by:
National Natural Science Foundation of China(51772077);Henan University Science and Technology Innovation Team(19IRTSTHN027);Henan Natural Science Foundation(182300410228);Henan Natural Science Foundation(182300410275)

摘要/Abstract

摘要：

本工作采用真空热压烧结的方法, 研究Mo₂Ga₂C粉体的烧结性能, 制备致密的Mo₂Ga₂C块体材料, 并且表征所制备材料的微观结构。实验发现750 ℃是合适的烧结温度, 过高的烧结温度(850 ℃)会导致样品分解, 主要产物为Mo₂C。在750 ℃烧结过程中, 随着烧结时间的延长, 样品的晶粒没有明显长大, 但是样品内部空隙显著变小, 内部织构增强, 相对密度明显提高。因为Mo₂Ga₂C晶体的片状结构, 热压烧结过程中, 部分片状晶粒会偏转, 导致烧结样品的多数晶粒的(00l)晶面会倾向垂直于热压方向。在750 ℃烧结8 h, 可以得到几乎完全致密(相对密度98.8%)的Mo₂Ga₂C块体材料。

关键词: MAX相, Mo₂Ga₂C, 烧结, 热压

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

中图分类号:

TG174

金森, 王作通, 杜亚琼, 胡前库, 禹建功, 周爱国. 双A层MAX相Mo₂Ga₂C的热压烧结研究[J]. 无机材料学报, 2020, 35(1): 41-45.

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.

图/表 6

图1 不同烧结温度下样品的XRD图谱

Fig. 1 XRD patterns of samples sintered at different temperatures

图2 850 ℃热压烧结2 h样品的照片, 红色圆圈标记的明亮颗粒是析出的Ga

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

表1 烧结时间对样品密度及相对密度的影响

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

图3 (a)不同时间烧结的Mo2Ga2C样品的XRD图谱和(b)热压样品的XRD图谱中(008)峰与(103)峰强度的比值

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

图4 Mo2Ga2C粉末的低倍和高倍扫描电镜照片

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

图5 (a~d)750 ℃热压分别烧结2、4、6和8 h Mo2Ga2C块体的断面SEM照片, (e)图(d)的高倍放大照片, (f)850 ℃热压烧结2 h样品的断面SEM照片

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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双A层MAX相Mo₂Ga₂C的热压烧结研究

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

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