Study on Grain Fragmentation of Aluminum Nitride Microcrystal under High Pressure

doi:10.3724/SP.J.1077.2012.12198

Abstract

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

CLC Number:

TQ174

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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