运用DTA、XRD、SEM等测试手段, 研究了CeO2 添加到MgO-Al2O3-SiO2-TiO2 系统后玻璃的形成、相变和介电性能. 研究结果表明, 在MgO-Al2O3-SiO2-TiO2 系统中引入CeO2可以降低玻璃的析晶倾向, 玻璃的相变过程也随之变化, 随着CeO2含量的增加, 硅钛铈矿相出现, 金红石和堇青石的相对含量均有所减少, 而硅钛铈矿相的相对含量不断增加. 在微波频率下(10GHz), 材料的介电常数可在7.5~10.5范围内调控, 介电损耗<5.5×10-4.
The glass-forming, the crystallization process and microwave dielectric properties of MgO-Al2O3-SiO2-TiO2 system glasses adding CeO2 were investigated by means of DTA, XRD, SEM. Results show that spontaneous
crystallization of the MgO-Al2O3-SiO2-TiO2 system glasses is obviously prevented with the increass of CeO2 content. After heat treatment (nucleation at 770℃ for 4h and cryatal growth at 1200℃ for 1.5h) the crystallized volume fraction of rutile and cordierite decrease and that of perrierite increases. The glass-ceramics obtained by crystallization of the glasses have dielectric constant of 7.5--10.5, and microwave loss less than 5.5×10-4.
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