组成对R_2O-CaO-ZnO-Al_2O_3-SiO_2系统分相的影响

Influence of Compositions on Phase Separation in R_2O-CaO-ZnO-Al_2O_3-SiO_2 System

通过大量的配方实验和ＯＭ、ＴＥＭ观察，系统研究了Ｒ２Ｏ－ＣａＯ－ＺｎＯ－Ａｌ２Ｏ３－ＳｉＯ２系统分相与组成间的相互关系．研究结果表明，Ｋ２Ｏ比Ｎａ２Ｏ更有利于系统的分相，用Ｎａ２Ｏ等摩尔取代Ｋ２Ｏ时，分相区向低铝高硅区收缩．此外，系统分相区大小还明显受到ＺｎＯ、ＣａＯ相对含量的影响，高锌系统具有更为宽广的分相区．Ａｌ２Ｏ３对Ｒ２Ｏ－ＣａＯ－ＺｎＯ－Ａｌ２Ｏ３－ＳｉＯ２系统分相影响呈现出明显的反常现象．在ＺｎＯ含量为０．５５ｍｏｌ的系统中，当Ｒ２Ｏ由０．１０ｍｏｌＫ２Ｏ＋０．１０ｍｏｌ Ｎａ２Ｏ共同引入时，分相区大小和分相结构尺度都呈现出明显的铝反常现象，而Ｒ２Ｏ仅由 ０．２０ｍｏｌＫ２Ｏ引入时；仅分相结构尺度呈现出明显的铝反常现象，反常点的 Ａｌ２Ｏ３含量约为 ６．２０ｍｏｌ％．在一定的热处理条件下，适当增加 ＳｉＯ２的含量有利于系统分相，但当 ＳｉＯ２的含量过高时，分相将由连通结构逐渐转变为孤立相分布于连续基质相中的液滴状结构，甚至消失．

The influence of compositions on phase separation in R2O-CaO-ZnO-Al2O3-SiO2system was investigated in detail by OM and TEM. The studied results show that a wide miscibilitygap is in K2O- CaO-ZnO-Al2O3-SiO2 system and it will down to the region of the concentrationsof low Al2O3 and high SiO2 with the equimolecular substitution of K2O by Na2O, and the higherthe content of ZnO is, the larger the phase separation region is. It is evident that in the region oflow Al1O3 concentration the tendency towards phase separation increases with increasing Al2O3content and when Al2O3 content is above 6.20 mol% this tendency decreases with increasing Al2O3content.