Li Xiaolei1,2, Ma Hongan2, Zang Chuanyi1, Zheng Youjin2,3, Liu Yu1, Zuo Guihong3, Li Jigang1, Li Shangsheng2, Jia Xiaopeng1, 2
(1.Henan Polytechnic University, Jiaozuo 454000, China;
2.National Lab of Superhard Materials, Jilin University, Changchun 130012, China;
3.Mudanjiang Teachers College, Mudanjiang 157012, China)
Abstract High-density AlN ceramics were fabricated without sintering additives at high pressure (5.0 GPa) and temperature (1300~1800 °C). The sintered bodies were characterized by XRD, SEM and micro-Raman spectroscopy (MRS). Controlling fracture mode was intragranular when the sintering temperature was as low as 1400 °C 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). The residual compression stress of the AlN ceramics sintered at 5.0 GPa and 1700 °C for 125 min is 2.0 GPa. The residual compression stress is increased according to the extension of the sintering time.