摘要
研究了以电融Ｍｕｌｉｔｅ、ＺｒＯ２、Ａｌ２Ｏ３、ＴｉＯ２为原料制取Ｍｕｌｉｔｅ－Ａｌ２ＴｉＯ５－ＺｒＯ２复相陶瓷过程中烧成温度及热应力对材料的结构性能的影响。发现该材料的体密度随烧成温度的变化很奇特，Ｘ—衍射表明该系统相结构非常复杂，除主晶相Ｍｕｌｉｔｅ、ｍ－ＺｒＯ２和Ａｌ２ＴｉＯ５以外，还有次晶相ＭｇＳｉＯ３、Ｍｇ２ＴｉＯ４、Ｔｉ０．５Ｚｒ０．５Ｏ２和Ａｌ４Ｔｉ２ＳｉＯ１２等。晶界开裂以及大量气孔的存在是瓷体烧结困难和强度韧性低下的原因。
A method of producing mullite/ZrO 2/Al 2TiO 5 multiphase ceramics with fused mullite、Al 2O 3 and TiO 2 as raw materials was introduced. The results of X-ray diffractory analysis showed that the final composition of the system was very complicated. Besides the major phases, such as mullite、zirconia and aluminum titanate, there were many kinds of minor phases i.e.Mg 2TiO 4、MgSiO 3 Al 4Ti 2SiO 12 and Ti 0.5 Zr 0.5 O 2 etc. The grain boundary cracking caused by thermal mismatch and the volume increase effect of tetragonal zirconia phase transformation made it difficult to sinter the ceramics to full density. That was why the strength and toughness of the achieved material were so low. In the experiment, it also seemed that titania had little effect or even no effect to stablize tetragonal zirconia at room temperature, though its solubility in zirconia was higher than that in mullite.
出处
《硅酸盐通报》
CAS
CSCD
1999年第1期52-57,共6页
Bulletin of the Chinese Ceramic Society
关键词
复合陶瓷
烧成
温度
性能
结构
mullite, Al 2TiO 5, ZrO 2, multiphase ceramic, strength, toughness, grain boundary
