摘要
为了探讨在无压烧结过程中α-Al2O3纳米粉体的烧结行为和致密化过程,采用高分子网络凝胶法制备了α-Al2O3纳米粉体,经冷压成型后无压烧结了Al2O3陶瓷.结果表明:α-Al2O3晶种的加入明显降低了高分子网络凝胶法制备α-Al2O3粉体的相转变温度,在950℃较低温下就可获得α-Al2O3纳米粉体;生坯的相对密度随成型压力的增加而增大,当成型压力为1 420MPa时获得了相对密度为56.0%的Al2O3生坯;Al2O3陶瓷相对密度随生坯初始密度和烧结温度升高而增大,在1 500℃烧结相对密度为52.8%的生坯获得了晶粒尺寸为1～2μm、相对密度为95.7%的Al2O3陶瓷.
In order to inquire into the sintering behavior and the processes of densification of the a-Al2O3 nanopowders, the a-Al2O3 nanopowders synthesized by the polyacrylamide gel method were used to sinter bulk Al2O3 ceramics. The presence of the a-Al2O3 seeds can evidently decrease the phase formation temperature of the a-Al2O3 synthesized by the polyacrylamide gel method and obtain the a-Al2O3 nanopowders at a lower temperature of 950~C. The relative density of the Al2O3 green body increases with increasing compaction pressure on the green compacts and the Al2O3 green compacts with relative density of 56.0% are obtained at compaction pressure of 1 420 MPa. The relative density of the sintered Al2O3 ceramics increases with increasing the starting relative density of the green compacts and sintering temperature and the Al2O3 ceramics with a grain size of 1-2μm and a relative density of 95.7% were obtained by sintering the green compacts with relative density of 52.8% at 1 500℃.
出处
《东北师大学报（自然科学版）》
CAS
CSCD
北大核心
2012年第2期60-64,共5页
Journal of Northeast Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(11075125)
