Patent ID: 9096471
Filing Date: 2015-08-04
Classification: C04B,H01L,Y10T

Abstract:
1. A method for producing a layered material, wherein the layered material comprises two metal sheets, one ceramic sheet, and at least one additional metal sheet which is made of a material which does not melt at a heating temperature during spark plasma sintering, wherein a difference in melting temperature between the two metal sheets is 140° C. or less, wherein the metal sheets and the ceramic sheet are stacked together such that the ceramic sheet is adjacent to each of the metal sheets, and the ceramic sheet is bonded to the adjacent metal sheets through spark plasma sintering, wherein the method is characterized by comprising: stacking two metal sheets on both surfaces of the ceramic sheet so that the ceramic sheet is adjacent to each of the metal sheets and stacking the additional metal sheet on the surface of at least one of the two metal sheets on the side opposite the surface which is in contact with the ceramic sheet: disposing the stacked product of the metal sheets, the ceramic sheet, and the additional metal sheet between a pair of electrodes for spark plasma sintering; and applying pulse current between the electrodes while securing electrical conduction between the electrodes and heating at a temperature between the temperature lower by 150° C. than the melting temperature of the higher-melting-temperature metal sheet of the two metal sheets, and the temperature lower by 10° C. than the melting temperature of the lower-melting-temperature metal sheet of the two metal sheets, to thereby bond the two metal sheets to both surfaces of the ceramic sheet, and bond the additional metal sheet to the surface of at least one of the two metal sheets on the side opposite the surface bonded to the ceramic sheet.