(1.桂林电子科技大学 信息材料科学与工程系，桂林 541004；
2. 桂林电子科技大学 广西信息材料重点实验室，桂林 541004)
摘 要: 采用烧结法制备添加氧化铈的CaO-Al2O3-SiO2系微晶玻璃材料，并对其进行差热分析(DTA)、X射线衍射分析、扫描电镜(SEM)观察和性能测试。结果表明：添加少量氧化铈能够降低玻璃的玻璃转变温度和析晶峰值温度，促进玻璃粉体的烧结致密化，但氧化铈加入量过多将会阻止玻璃的烧结和晶化；氧化铈的最佳添加量(质量分数)为5%；随着氧化铈含量的增加，样品的介电常数呈“N”字形变化，而样品的介电损耗则表现为先减小后稍微增加的变化趋势。样品的热膨胀系数随氧化铈含量的增加基本呈下降趋势。添加5%氧化铈的样品在925 ℃烧结后，其相对密度达99.1%，其介电常数、介电损耗和热膨胀系数分别为6.7、0.09%和3.42×10−6 K−1。
关键字: CaO-Al2O3-SiO2系微晶玻璃；氧化铈；烧结；性能
system glass-ceramics
（1. Department of Information Materials Science and Engineering, Guilin University of Electronic Technology,
Guilin 541004, China;
2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China）
Abstract:Glass-ceramics of CaO-Al2O3-SiO2 system doped with ceria were prepared by sintering method and were characterized by differential thermal analysis (DTA), X-ray diffractometry (XRD), scanning electron microscopy (SEM) and property measurements. The results show that minor ceria addition decreases the glass transition temperature (Tg) and the crystallization peak temperature (Tp) of the glasses, and improves the sintering densification of glass-ceramics. But too much ceria addition will inhibit the sintering and crystallization. The optimal amount of ceria added is 5% (mass fraction). With increasing the ceria content, the dielectric constant of glass-ceramics changes like an “N” letter and their dielectric loss firstly decreases and then slightly increases. The thermal expansion coefficient of the samples basically reduces with increasing ceria content. The sample with 5% ceria sintered at 925 ℃ exhibits high relative density (99.1%). The dielectric constant and loss as well as thermal expansion coefficient are 6.7, 0.09% and 3.42×10−6K−1, respectively.
Key words: ceria; CaO-Al2O3-SiO2 system glass-ceramics; sintering; properties
