研究了MgO、Y2O3和La2O3 3种不同氧化物掺杂对高纯氧化铝致密化速率的影响.测试了试样在1250℃不同时间烧结的密度,观察在1400℃不同时间烧结的微观结构.掺杂降低了Al2O3的致密速率,而且对于相同的掺杂,随着掺杂量的增加,致密速率也随之下降;具有较大离子半径的稀土氧化物Y2O3和La2O3比MgO有更强的抑制高纯Al2O3致密的作用.掺杂的Al2O3的晶粒尺寸明显小于纯Al2O3.
参考文献
| [1] | Suzuki H Y;Shinozaki K;Kuroki H et al.Sintered microstucture and mechanical properties of high purity alumina ceramics made by high-speed centrifugal compaction process[J].Key Engineering Materials,1999,159-160:187-192. |
| [2] | Mamoun A;Epicier T .Microstructural study of a MgO-doped alumina-based ceramic[J].Materials Chemistry and Physics,1992,32:169-176. |
| [3] | Gülgün M A;Putayev V;Rühle M .Effects of yttrium doping α-Al2O3:Ⅰ,microstructure and microchemistry[J].Journal of the American Ceramic Society,1999,82(07):1849-1856. |
| [4] | Y. Takigawa;Y. Ikuhara .Grain boundary bonding state and fracture energy in small amount of oxide-doped fine-grained Al2O3[J].Journal of Materials Science,1999(9):1991-1997. |
| [5] | Yan-Zun Li;Chongmin Wang;Helen M. Chan;Jeffrey M. Rickman;Martin P. Harmer;Jan M. Chabala;Kons .Codoping of alumina to enhance creep resistance[J].Journal of the American Ceramic Society,1999(6):1497-1504. |
| [6] | Fang Jianxin;Thompson A M;Harmer M P et al.Effect of yttrium and lanthanum on the final-stage sintering behavior of ultrahigh-purity alumina[J].Journal of the American Ceramic Society,1997,80(08):2005-2012. |
| [7] | Wang Jenqdaw;Raj R .Estimate of the activation energies for boundary diffusion from rate-controlled sintering of pure alumina,and alumina doped with zirconia or titania[J].Journal of the American Ceramic Society,1990,73(05):1172-1175. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%