HU Jilin ^1,2 LIU Xin ¹ CAO Yu ¹ DING Changze ¹ ZHOU Xinxing ¹

（1.Department of Chemistry and Materials Science, Hunan Institute of Humanities, Science and Technology, Loudi Hunan 417001,China；2.College of Materials Science and Engineering, Hunan University, Changsha Hunan 410082, China)

Abstract: The effects of different sintering temperatures on the properties of 95 alumina ceramics prepared by mould pressing, using MnO₂-TiO₂-CaO-La₂O₃ heterogeneous additive as sintering aids, were studied. Phase compositions and morphologies of alumina ceramic samples were characterized by XRD and SEM. The results show that the samples have almost been densely sintered and their composite properties are the best when sintered at 1450℃. The shrinkage is 28.5% and the bulk density is 3.78g.cm^-3. The bending strength and Rockwell hardness reach 357.12MPa and 78.0 separately.

Key words: low-temperature sintering; alumina ceramics; MnO₂-TiO₂-CaO-La₂O₃ additives; bending strength