碱土云母可切削玻璃陶瓷的研究

MACHINABLE GLASS-CERAMICS BASED ON ALKALINE EARTH MICA

基于Ｂａ（０．５）Ｍｇ３（Ｓｉ３ＡｌＯ（１０））Ｆ２－Ｍｇ２Ａｌ４Ｓｉ５Ｏ（１８）－Ｃａ３（ＰＯ４）２系统，制备出了以含Ｂａ碱土云母为主晶相的可切削玻璃陶瓷，弯曲强度σｂ＝２２９ＭＰａ，断裂韧性Ｋ（ＩＣ）＝２．４８ＭＰａ·ｍ（１／２），钻孔速度大于７ｍｍ／ｍｉｎ。优良性能的获得借助于Ｂａ云母玻璃陶瓷可控的微观组织，即相互交错的云母晶体和“卷心菜”的组织特征，观察到了两类典型的断口形貌：云母晶体层内断的层状花样和沿（００１）晶面层间断的小刻面花样．

Glass-ceramic containing barium-mica in the systerm Ba(0.5)Mg3(Si3AlO(10))F2 Mg2Al4Si5O(18)Ca3(PO4)2 show high mechanical strength and good machinability,σb=229 MPa,K(IC)=2.48MPa.m(1/2),drilling speed>7mm/min. Such good properties are attributable to the controlledmicrostructure of the barium-mica-containing glass-ceramics,i.e.inter locking mica crystalsand″cabbage-head″feature,Two kinds of typical fracture pattern were observed,i.e.layerlacks pattern and cleavage pattern.