AlN微米晶高压下的晶粒演化研究

doi:10.3724/SP.J.1077.2012.12198

无机材料学报 ›› 2012, Vol. 27 ›› Issue (12): 1313-1316.DOI: 10.3724/SP.J.1077.2012.12198 CSTR: 32189.14.SP.J.1077.2012.12198

AlN微米晶高压下的晶粒演化研究

李小雷¹, 王红亮¹, 张勤善², 王利英¹, 李尚升¹, 宿太超¹

(1. 河南理工大学材料科学与工程学院, 焦作454000; 2. 焦作大学化工学院, 焦作454003)

收稿日期:2012-03-30 修回日期:2012-05-22 出版日期:2012-12-20 网络出版日期:2012-11-19
基金资助:
国家自然科学基金(51001042/E0105)

Study on Grain Fragmentation of Aluminum Nitride Microcrystal under High Pressure

LI Xiao-Lei¹, WANG Hong-Liang¹, ZHANG Qin-Shan², WANG Li-Ying¹, LI Shang-Sheng¹, SU Tai-Chao¹

(1. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; 2. School of Chemical Industry, Jiaozuo University, Jiaozuo 454003, China)

Received:2012-03-30 Revised:2012-05-22 Published:2012-12-20 Online:2012-11-19
Supported by:
National Natural Science Foundation of China(51001042/E0105)

摘要/Abstract

摘要： 用六面顶压机研究了AlN微米粉体高压(2.0~6.0 GPa)下晶粒演化行为, 用 X 射线衍射仪和扫描电子显微镜对高压样品的物相组成、晶粒尺寸以及微观形貌进行了表征. 结果表明, 在室温下, AlN压制体的相对密度随着压力的升高也相应增加, 开气孔率则呈下降趋势. 经6.0 GPa压制后样品的相对密度达到88.72%, 出现了“冷烧结”现象. 高压作用后AlN微米晶的粒径变小, 压力从常压升高到6.0 GPa时微粉的平均粒径由2.10 μm下降到1.47 μm, 存在明显的压制碎化效应. 该效应提高了AlN粉体的表面自由能, 增强了粉体烧结的驱动力; 另一方面, 由于AlN粉末产生了一定的位错、裂纹等缺陷, 还可以起到活化烧结的作用, 提高AlN陶瓷的烧结速率.

关键词: 高压, AlN, 压致碎化, 冷烧结

Abstract: Grain fragmentation of AlN micron?powder under high pressure (2.0–6.0 GPa) was studied on cubic high pressure apparatus. Phase composition, grain size and microstructure of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that relative density of AlN microcrystal increases and open pore decreases with the rise of high pressure. “Cold-sintering” occurs in the AlN sample pressed at 6.0 GPa because its relative density reaches 88.72%. Obvious pressure-induced grain fragmentation is observed during the compacting of AlN powder under high pressure. The average particle diameter drops to 1.47 μm from 2.10 μm when high pressure is increased to 6.0 GPa from atmospheric pressure. Pressure-induced grain fragmentation can improve the surface free energy of AlN powder and increase sintering driving force. Meanwhile, it can activate sintering to improve AlN sintering rate because of the presence of defects (such as dislocation, crack, etc.) caused by high pressure.

Key words: high pressure, aluminium nitride, pressure-induced grain fragmentation, cold sintering

中图分类号:

TQ174

李小雷, 王红亮, 张勤善, 王利英, 李尚升, 宿太超. AlN微米晶高压下的晶粒演化研究[J]. 无机材料学报, 2012, 27(12): 1313-1316.

LI Xiao-Lei, WANG Hong-Liang, ZHANG Qin-Shan, WANG Li-Ying, LI Shang-Sheng, SU Tai-Chao. Study on Grain Fragmentation of Aluminum Nitride Microcrystal under High Pressure[J]. Journal of Inorganic Materials, 2012, 27(12): 1313-1316.

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AlN微米晶高压下的晶粒演化研究

Study on Grain Fragmentation of Aluminum Nitride Microcrystal under High Pressure

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