The alumina silica compound powder is produced the low temperature sintering ceramic

摘要

PURPOSE:To enhance bending strength and to lower dielectric constant by a method wherein alumina-silica composite powder is manufactured by having alumina powder coated with a silicon oxide, this alumina-silica compound powder is mixed with bismuth trioxide powder, and the mixture is sintered after molding. CONSTITUTION:Alumina-silica composite powder is manufactured by coating a silicon oxide on the surface of alumina powder of 0.1 to 5.0mum in average diameter for example. This composite powder and a bismuth oxide powder are mixed, a solvent, a binder, a dispersant and the like are added thereto, they are kneaded and formed into paste. After this paste has been formed into a green sheet by doctor blade method for example, the green sheet is sintered at 1100 deg.C or lower, and a low temperature sintered ceramic substrate is obtained. At this point, after conductive paste has been screen-printed on the green sheet, a plurality of green sheets are laminated, they are sintered, and a multilayer wiring substrate is obtained.