Effect of B_2O_3 and P_2O_5 on fluorosilicic mica glass-ceramic sintering process
- VernacularTitle:B_2O_3、P_2O_5对氟硅云母玻璃陶瓷烧结性能的影响
- Author:
Shun WU
;
Zhongyi WANG
;
Xiaogang CAO
- Publication Type:Journal Article
- Keywords:
Fluorosilicic mica;
Sintering;
Glass-ceramic;
Dental materials
- From:
Journal of Practical Stomatology
1996;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To study the effect of B 2O 3 and P 2O 5 on fluorosilicic mica glass-ceramic sintering process.Methods: Six sets of K 2O-MgO-SiO 2-MgF glass were prepared by using B 2O 3 and P 2O 5as sintering aid respectively. Green bodies of the glass powder were formed by gelcasting and sintered at 800,850,900,950 and 1 000 ℃ for 6 h respectively. The sintering and crystallization behavior were studied by thermal shrinkage , X-ray diffraction (XRD) and SEM.Results:The shrinkage rate of the glass with 2% B 2O 3 and P 2O 5 was the highest ,while that of the glass with 5% P 2O 5 the lowest. The size of the precipitated crystal from the glass ceramics containing 2% B 2O 3 and 2% P 2O 5 was bigger.Conclusion:The density and shrinkage measurements of the sintered bodies show that the glass powder of pure K 2O-MgO-SiO 2-MgF system has poor sinterability, while minor addition (
