Patent ID: 6395117
Filing Date: 2002-05-28
Classification: C04B,H05K

Abstract:
A method for producing a ceramic green sheet which comprises:a step of subjecting a ceramic powder to dry grinding so that a spherical diameter Rs of the powder satisfies 0.01&lE;Rs&lE;0.5 [wherein Rs (&mgr;m) means 6/&rgr;cS (in which &rgr;c denotes a true density (g/cm3) of the ceramic powder, and S denotes a BET specific surface area (m2/g) of the ceramic powder)], a step of heat-treating the dry ground powder at a temperature of 250-1000Â° C. to adjust the average degree of aggregation Xâ€² represented by the formula Xâ€²=Râ€²m/Rs [wherein Râ€²m means a median diameter (&mgr;m) of the ceramic powder measured by a laser scattering method after the heat treatment and Rs (&mgr;m) has the same meaning as defined above] to a range of 2.5-15, a step of mixing the thus heat-treated powder with organic components in such an amount that the organic components occupy 20-55% of the ceramic green sheet in volumetric ratio and the void content of the ceramic green sheet satisfies 5-25% and a solvent in a necessary amount, thereby preparing a ceramic slurry, and a step of molding the ceramic slurry into a ceramic green sheet.