Sol-Gel法制备CBS微晶玻璃材料的研究

Study on Preparation of CBS Glass-ceramics by Sol-Gel Process

以正硅酸乙酯、硝酸钙、硼酸为原料，用溶胶-凝胶（Sol—Gel）法制备了CaO-B2O3-SiO2微晶玻璃材料，研究了水硅比对凝胶时间的影响。利用热重-差热（TG-DSC），X-射线衍射（XRD）及扫描电子显微镜（SEM）测试手段表征材料的烧结性能、微观结构。测试表明，该材料具有良好的介电性能（介电常数εr=5．112，介电损耗tan δ=1.0×10^-3，1MHz），微观结构由大量的CaSiO3（硅灰石），CaB2O4，SiO2微晶和玻璃相组成，晶相被玻璃相包裹着，外加少量的气孔，晶粒大小为100-200nm，该材料适用于高频电子元器件等领域。

This paper describes the preparation of CaOB2 O3-SIO2 glass-ceramics by Sol-Gel method, using tetraethoxysilane（TEOS）, calcium nitrate [Ca（NO3 ）2 · 4H2O] and boric acid （H3BO3） as raw material. The effect of H2O/Si on gelling time were studied. TG-DSC,XRD,SEM were used to characterize the sintering performance and microstructure of the material. The dielectric constant is 5. 112 and dielectric loss is 1.0×10^-3 at the frequency of 1 MHz. The main crystalline phases in the samples are most CaO. SiO2 （CS）, some CaO · B2O3 （CB） and some SiO2. The grain size of the sintered samples is ranging from 100 nm to 200 nm , with some residual glass phases and pores. It is suggested that the glass ceramics would be a promising material for high frequency integrated circuits and electronic components.