Effect of sintering temperature on the shrinkage and microstructure of dental fluorosilicic mica glass-ceramics with different particle size
- VernacularTitle:烧结温度对不同粒度氟硅云母玻璃陶瓷收缩率及微观形貌的影响
- Author:
Jiang LI
;
Xiaogang CAO
;
Zhongyi WANG
- Publication Type:Journal Article
- Keywords:
Sintering;
Temperature;
Particle size;
Shrinkage;
Microstructure;
Mica;
Glass-ceramics
- From:
Journal of Practical Stomatology
1996;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the effect of sintering temperature on the shrinkage and microstructure of dental fluorosilicic mica glass-ceramic with two different particle size. Methods:Fluorosilicic mica glass powder with average particle diameter of 72.8 ?m was named PO and that with average diameter of 4.5 ?m was named Pm. PO and Pm were molded by cool isostatic pressing technique and then sintered at different temperatures between 600-1 000 ℃. The shrinkage and microstructure of the sintered blocks of PO and Pm were systematically compared with each other. Results:The shrinkage of PO and Pm blocks were all increased as the temperature ascended. However, the shrinkage curves were distinctly different. At the same sintering temperature the shringkage of Pm was larger than that of PO. Moreover, the turning points of temperature (reflecting transition of the sintering mechanisms) of Pm was higher than that of PO. The microstructure observation showed that sintering at 950 ℃ resulted in mica crystal in glass-ceramics and the best compactness of the sintered blocks of both PO and Pm. Conclusion:Sintering glass powder of smaller particle size at 700-850 ℃ may achieve better sintering compactness.
