Patent ID: 8858865
Filing Date: 2014-10-14
Classification: C04B,H01L,H05K

Abstract:
1. A silicon nitride substrate manufacturing method in which a slurry is produced by mixing a silicon nitride powder, a sintering additive powder, a binder, and a dispersant in an organic solvent which is a dispersion medium in a raw material setting/mixing process, and the slurry is formed into a sheet, followed by degreasing and sintering, characterized in that an Al concentration in the silicon nitride substrate is 0.3 mass % or less in terms of Al 2 O 3 , the oxygen content of the silicon nitride powder is 2.0 mass % or less and the specific surface area of the silicon nitride powder is 3 to 11 m and the slurry is produced by mixing the silicon nitride powder, the sintering additive powder, the binder, and the dispersant in the organic solvent at a temperature of 10 to 45° C. in the raw material setting/mixing process, so that an oxygen increase from the silicon nitride powder before the mixing as compared to the silicon nitride powder after the mixing is in a range of 0.05 to 0.5 mass %, and a specific surface area of the silicon nitride powder after the mixing is 5 to 12 m