Microstructure and dielectric properties of Ca-Al-B-Si-O glass/Al_2O_3 composites with various alkali oxides contents  

作　　者：刘明 周洪庆 朱海奎 岳振星 赵建新 

机构地区：[1]College of Materials Science and Engineering,Nanjing University of Technology [2]State Key Laboratory of Materials-Oriented Chemical 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10期2733-2739,共7页中南大学学报（英文版）

基　　金：Project(2007AA03Z0455) supported by the National High Technology Research and Development Program ("863" Program) of China;Project(BE2010194) supported by Science & Technology Pillar Program of Jiangsu in China;Project(BE2009168) supported by Science & Technology Pillar Program of Jiangsu in China;Project supported by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions;Project(KF201103) supported by State Key Laboratory of New Ceramic and Fine Processing Tsinghua University;Project(CXZZ12_0415) supported by Innovation Foundation for Graduate Students of Jiangsu Province,China

摘　　要：The effects of alkali oxides （Na2O and K2O addition on both the sintering behavior and dielectric properties of Ca-AI-B-Si-O glass/Al2O3 composites were investigated by Fourier transform infrared spectroscopy （FTIR）, differential scanning calorimeter （DSC）, X-ray diffractometry （XRD） and scanning electron microscopy （SEM）. The results show that the increasing amount of alkali oxides in the glass causes the decrease of [SiO4], which results in the decrease of the continuity of glass network, and leads to the decrease of the softening temperature Tf of the samples and the increasing trend of crystallization. And that deduces corresponding rise of densification, dielectric constant, dielectric loss of the low temperature co-fired ceramic （LTCC） materials and the decrease of its thermal conductivity. By contrast, the borosilicate glass/A1203 composites with 1.5% （mass fraction） alkali oxides sintered at 875 ℃ for 30 rain exhibit better properties of a bulk density of 2.79 g/cm3, a porosity of 0.48%, a 2 value of 2.28 W/（m.K）, a er value of 7.82 and a tand value of 9.1 × 10-4 （measured at 10 MHz）.The effects of alkali oxides(Na2O and K2O) addition on both the sintering behavior and dielectric properties of Ca-Al-B-Si-O glass/Al2O3 composites were investigated by Fourier transform infrared spectroscopy(FTIR),differential scanning calorimeter(DSC),X-ray diffractometry(XRD) and scanning electron microscopy(SEM).The results show that the increasing amount of alkali oxides in the glass causes the decrease of [SiO4],which results in the decrease of the continuity of glass network,and leads to the decrease of the softening temperature Tf of the samples and the increasing trend of crystallization.And that deduces corresponding rise of densification,dielectric constant,dielectric loss of the low temperature co-fired ceramic(LTCC) materials and the decrease of its thermal conductivity.By contrast,the borosilicate glass/Al2O3 composites with 1.5%(mass fraction) alkali oxides sintered at 875 °C for 30 min exhibit better properties of a bulk density of 2.79 g/cm3,a porosity of 0.48%,a λ value of 2.28 W/(m·K),a εr value of 7.82 and a tan δ value of 9.1×10-4(measured at 10 MHz).

关 键 词：borosilicate glass alkali oxides Ca-AI-B-Si-O glass AL2O3 MICROSTRUCTURE thermal properties dielectric properties 

分 类 号：TB332[一般工业技术—材料科学与工程]