组成对堇青石微晶玻璃析晶和性能的影响  

Effects of Composition on Crystallization and Properties of Cordierite Glass-Ceramics

作　　者：赵彦钊[1] 杨崔月 贺云鹏 胡智敏 呼浩 殷海荣[1] ZHAO Yanzhao;YANG Cuiyue;HE Yunpeng;HU Zhiming;HU Hao;YIN Hairong(School of Materials Science&Engineering,Shaanxi University of Science&Technology,Xi′an,710021,China;Dahe Ceramic Materials Co.,Ltd.,Weiyuan 642450,Sichuan,China)

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021 [2]大禾陶瓷原料有限公司,四川威远642450

出　　处：《硅酸盐学报》2021年第12期2710-2716,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金重点项目(51472151)。

摘　　要：根据Mg O-A1_(2)O_(3)-SiO_(2)三元系统相图,利用三角型规则设计出22种组成,并用熔融烧结法合成堇青石。采用差热分析、X射线衍射分析及扫描电子显微镜研究了堇青石微晶玻璃的析晶和晶相转变过程,并对其显气孔率以及热膨胀性能进行测试。结果表明:随着组成变化,差热曲线出现2种类型的晶化放热峰。在理论组成附近,为双晶化放热峰,析出Mg Al_(2)Si_(3)O_(10)和α-堇青石晶相,且理论组成下的堇青石热膨胀系数最低,为1.27×10^(-6)/℃;而当组成中MgO的含量增加到16.6%以上时,晶化放热峰为单峰,单峰下析出α-堇青石晶相,此时堇青石样品显气孔率显著降低,最低为0.32%。According to Mg O-A1_(2)O_(3)-SiO_(2) ternary system phase diagram,22 kinds of compositions were designed by using triangular rule,and cordierite was synthesized by melting sintering method.The crystal evolution and phase transition of cordierite glass-ceramics was studied by means of differential thermal analysis,X-ray diffraction and scanning electron microscope.The apparent porosity and thermal expansion properties were tested.The results show that there are two kinds of exothermic peaks in the differential thermal curve with the change of composition.Near the theoretical composition,a double crystallization exothermic peak occurs,and Mg Al_(2)Si_(3)O_(10) andα-cordierite crystal phase is precipitated.The thermal expansion coefficient of cordierite under the theoretical composition is the lowest,which is 1.27×10^(-6)/℃.However,when the MgO content in the composition increases to more than 16.6%,the exothermic peak of crystallization is unimodal,and onlyα-cordierite crystal phase is precipitated under the single peak.At this time,the apparent porosity of cordierite sample is on the decrease significantly,with a minimum value of 0.32%.

关 键 词：堇青石 微晶玻璃 组成 晶相转变 

分 类 号：TQ171.73[化学工程—玻璃工业]