Sintering,crystallization and dielectric properties of CaO-B_2O_3-SiO_2 system glass ceramics  

作　　者：戴斌 朱海奎 周洪庆 许贵军 岳振星 

机构地区：[1]State Key Laboratory of Materials-Oriented Chemical Engineering(Nanjing University of Technology) [2]College of Materials Science and Engineering,Nanjing University of Technology [3]State Key Laboratory of New Ceramic and Fine Processing(Tsinghua University)

出　　处：《Journal of Central South University》2012年第8期2101-2106,共6页中南大学学报（英文版）

基　　金：Project(2007AA03Z0455) supported by the National High Technology Research and Development Program of China;Project(BE2010194) supported by Science&Technology Pillar Program of Jiangsu Province, China;Project(KF201103) supported by the State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, China;Project supported by the Priority Academic Development of Jiangsu Higher Education Institutions, China

摘　　要：CaO-B203-SiO2 （CBS） glass powders are prepared by conventional glass melting method at different melting temperatures whose properties and microstructures are characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. It is found that there are SiO2 and some unknown phases in CBS glass melting liquid from 1 300 ℃ to 1 500 ℃ and the amount of these phases decreases with the increase of the melting temperature. The CBS glass melted at 1 450 ℃ could be sintered from 830 ℃ to 930 ℃ and the bulk densities of the samples are all higher than 2.4 g/cm^3. From the points of the properties and energy conservation, the melting temperature of 1 450 ℃ is the optimal melting temperature. The glass ceramic sintered at 850 ℃ exhibits better dielectric properties： er=6.33, tan6=2.2×10^-3 at 10 GHz, and the major phases of the samples are CaSiO3, CaB2O4 and SiO2.CaO-B2O3-SiO2 (CBS) glass powders are prepared by conventional glass melting method at different melting temperatures, whose properties and microstructures are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It is found that there are SiO2 and some unknown phases in CBS glass melting liquid from 1 300 °C to 1 500 °C and the amount of these phases decreases with the increase of the melting temperature. The CBS glass melted at 1 450 °C could be sintered from 830 °C to 930 °C and the bulk densities of the samples are all higher than 2.4 g/cm3. From the points of the properties and energy conservation, the melting temperature of 1 450 °C is the optimal melting temperature. The glass ceramic sintered at 850 °C exhibits better dielectric properties:εr=6.33, tan δ=2.2×10-3 at 10 GHz, and the major phases of the samples are CaSiO3, CaB2O4 and SiO2.

关 键 词：glass ceramics CAO-B2O3-SIO2 SINTERING dielectric properties microstructure 

分 类 号：TQ174.1[化学工程—陶瓷工业]