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• Main Authors: Yi-Wen Liu, 劉逸文
• Other Authors: Don-Tung Ray
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/87099525197483769795

碩士 === 國立成功大學 === 資源工程學系碩博士班 === 91 === In present highly developed information era, to increase electronic device density so as to fulfill the requirements of miniaturization and versatile functions, multilayer ceramic substrates and devices are more and more to be relied on. This is the key factor in the densification of chips on substrate, shortening chip connection and improving circuit quality and reliability. Tape casting is the main process to manufacture ceramic green film used for multilayer ceramic devices and substrates. It is necessary to prepare well-dispersed slurry so as to obtain well-qualified green films. The slurry property is the major factor affecting the preparation of green films and subsequent sintering results, as well as the quality and laminate ability of the products. In ceramic processing, the ideal slurry must show Newtonian fluid behavior, therefore to understand and control the rheological properties of slurry is an important work. This study used three dispersants to prepared BaTiO3 slurries. The influences of different dosage on the rheological properties of the slurry were investigated. The relationship between slurry property, powder packing in green film and dielectric strength of sintered body was correlated. The results show that the slurry at coagulated state appears to be Bingham or pseudoplastic fluid, with very high viscosity, while at dispersed state appears to be Newtonian fluid, with decreasing viscosity. BYK-111 (copolymer+phosphoric acid) is the best dispersant in this study. The experiment results also show that the dispersed state of the slurry has a significant effect on powder packing, surface roughness and microstructure. Well-dispersed slurry yielded high green density, high sintered density and much smooth the surface roughness. Electric properties such as the insulation resistance and dielectric strength, of dielectric prepared from well-dispersed slurries compared to non-dispersed are also superior.