摘要
应用差热分析(DTA),粉未X射线衍射(XRD)和扫描电子显微镜(SEM)研究了AlF_3-YF_3-BaF_2-CaF_2-MgF_2玻璃系统中不同MgF_2/YF_3值对玻璃形成和析晶性能的影响。结果表明:氟铝酸盐玻璃具有较高的玻璃转变温度T_g,析晶温度T_c,玻璃形成能力判据ΔT和H值都随MgF_2/YF_3变化而变化。当MgF_2/YF_3值介于0.4和O.75之间时,具有最大的T_c,ΔT和H值。这时玻璃具有较好的抗析晶性能和较强的形成能力。DTA,XRD和SEM取得了相一致的结果,并与氟锆酸盐玻璃作了比较。
The effects of different MgF_2/YF_3values on the properties of glass formation and crystallization in AlF_3-YF_3-BaF_2-CaF_2-MgF_2 system have been studied by means of differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron mi- croscope (SEM). The results show that the fluoroaluminate glasses have higher transition temperature T_g. The crystallization temperature T_c, glass forming ability criteria △T=T_c-T_g and H=(T_c-T_g)/T_g have a peak value, and thus the glass has better resist- ance to crystallization and higher forming abillity when MgF_2/YF_3 value is between 0.4 and 0.75. The results are coincident from the DTA, XRD and SEM. The results have also been compared with the fluorozirconate glasses.
基金
上海自然科学基金
关键词
氟铝酸盐玻璃
形成
析晶
性能
fluoroaluminate glass
glass formation
crystallization property
