Effects of Additives of CaO and Rare-Earth Oxides on the Sintering Behavior of AlN Ceramics
- Resource Type
- Article
- Authors
- Chih-Hung Chu; Yun-Hwei Shen; Chih-Peng Lin; Shaw-Bing Wen
- Source
- Journal of the Korean Physical Society, 52(5), pp.1545-1549 May, 2008
- Subject
- 물리학
- Language
- English
- ISSN
- 1976-8524
0374-4884
The effect of additives of CaO plus three different rare-earth oxides (Y, Sm and Gd, separately) on the sintering behavior of AlN ceramics has been evaluated at 1700℃ by using a MoSi2 heater and ambient atmosphere. The results of density measurements show that the atomic weight of the rare-earth element may substantially affect the apparent density of the sintered AlN specimen due to the kinetics of atomic diffusion during sintering. The optimum results of this study show that these additives are effective in obtaining an apparent density of 3.26 g/cm3 (approaching a 100 % theoretical density of AlN). The Vicker's hardness of the sintered AlN can reach a high value of 1310 kg/mm2 and an apparent density of 3.34 g/cm3. A longer soaking time of between 3 and 5 h is necessary to practically eliminate the minor oxide phases.