Li Xiaolei 1,2; Ma Hongan2; Zang Chuanyi1; Zheng Youjin2,3; Liu Yu1;
Zuo Guihong3; Li Jigang1; Li Shangsheng2; Jia Xiaopeng1, 2
(1. Henan Polytechnic University, 454000
2. National Lab of Superhard Materials, Jilin University, 130012
3. Mudanjiang Teachers College, 157012)
Abstract High-density AlN ceramics were fabricated without sintering additives at high pressure (5.0 GPa) and temperature (1 300 ~ 1 800 ℃). The sintered bodies were characterized by XRD, SEM and micro-Raman spectroscopy (MRS). Controlling fracture mode was intraguanular when the sintering temperature was as low as 1 400 ℃ under 5.0 GPa. The values of residual stresses due to the distortion of the AlN lattice were assessed using the Micro-Raman Spectroscopy (MRS). Residual compression stress of the AlN ceramics sintered at 5.0 GPa and 1 700 ℃ for 125 min is -2.0 GPa. The residual compression stress increased according to the extension of the sintering time.
Keywords aluminium nitride; high pressure sintering; microstructure; residual stress