Tape casting of borosilicate glass/Al_2O_3 composites for LTCC substrate with various relative molecular masses of PVB  

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 (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》2013年第1期37-43,共7页中南大学学报（英文版）

基　　金：Project(2007AA03Z455) supported by the National High Technology Research and Development Program of China;Projects(BE2009168)supported by Science&Technology Pillar Program of Jiangsu Province, China;Project supported by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions, China;Project(CXZZ12_0415) supported by the Innovation Foundation for Graduate Students of Jiangsu Province, China;Project(IRT1146) supported for Changjiang Scholars and Innovative Research Teamin University (PCSIRT) of China

摘　　要：The dispersion, stabilization and rheological properties of the slurry with various relative molecular masses of PVB were studied. The sintering properties, microstructure and dielectric properties of borosilicate glass/Al203 composites were also investigated. The intensities of the typical vibrating bands decrease with the decrease of the relative molecular mass of PVB, which demonstrates that the content of butyral groups in PVB binders decreases correspondingly, leading to a rapid decrease in the viscosity of the mixed slurry. The solid content of samples increases with the decrease of the relative molecular mass of PVB, and this further leads to the increase of tape thickness, bulk density and dried-shrinkage coefficient of tapes. The bulk density, relative density, three-point strength and dielectric constant of sintered samples increase with the increase of the solid content, and the shrinkage and dielectric loss decrease. By contrast, samples for PVB-5s exhibit better properties of a bulk density of 3.10 g/cm3, a relative density of 98.1%, a three-point strength of 208 MPa, aεt value of 8.01, a tanδ value of 7.6× 10^-4 at 10 MHz and a well matching with Ag electrodes.The dispersion, stabilization and rheological properties of the slurry with various relative molecular masses of PVB were studied. The sintering properties, microstructure and dielectric properties of borosilicate glass/Al2O3 composites were also investigated. The intensities of the typical vibrating bands decrease with the decrease of the relative molecular mass of PVB, which demonstrates that the content of butyral groups in PVB binders decreases correspondingly, leading to a rapid decrease in the viscosity of the mixed slurry. The solid content of samples increases with the decrease of the relative molecular mass of PVB, and this further leads to the increase of tape thickness, bulk density and dried-shrinkage coefficient of tapes. The bulk density, relative density, three-point strength and dielectric constant of sintered samples increase with the increase of the solid content, and the shrinkage and dielectric loss decrease. By contrast, samples for PVB-5s exhibit better properties of a bulk density of 3.10g/cm3 , a relative density of 98.1%, a three-point strength of 208 MPa, a ε r value of 8.01, a tanδ value of 7.6×10-4 at 10 MHz and a well matching with Ag electrodes.

关 键 词：CASTING PVB FTIR rheological behavior MATCHING microstructure 

分 类 号：TQ174.1[化学工程—陶瓷工业]