B_2O_3、P_2O_5对氟硅云母玻璃陶瓷烧结性能的影响

Effect of B_2O_3 and P_2O_5 on fluorosilicic mica glass-ceramic sintering process

目的 :研究B2 O3 、P2 O5对氟硅云母玻璃陶瓷烧结性能的影响。方法 :基础玻璃为SiO2 MgO MgF2 K2 O系统 ,按照x(B2 O3 P2 O5)·( 1 x) (SiO2 MgO MgF2 K2 O )的关系加入少量B2 O3 、P2 O5作为烧结助剂。分别在80 0、85 0、90 0、95 0、10 0 0℃进行烧结 ,测定体积收缩率。通过x射线衍射分析鉴定了烧结体晶相组成 ,采用扫描电镜对烧结体进行了微观结构观察。结果 :随着烧结温度升高 ,收缩率增加 ;加入质量分数为 2 %B2 O3 和P2 O5的玻璃烧结收缩率最高 ,加入 5 %P2 O5的玻璃收缩率最低。加入质量分数为 2 %B2 O3 和P2 O5的玻璃中析出的晶体直径和径厚比较大。结论 :B2 O3 和P2 O5影响SiO2 MgO MgF2 K2 O系统玻璃的烧结性能和晶体形貌。

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 (<2%)of P 2O 5 and/or B 2O 3 may improve the sinterability of glass powder.