Patent ID: 7993699
Filing Date: 2011-08-09
Classification: B22F,C04B,C22C,C23C,H01L,H05K,Y10T

Abstract:
1. A process for producing a metallized aluminum nitride substrate, comprising an intermediate material substrate preparation step for preparing a sintered aluminum nitride substrate having on its surface a layer composed of a composition comprising 100 parts by mass of at least one kind of high-melting point metal powder selected from the group consisting of tungsten powders and molybdenum powders, 1 to 10 parts by mass of aluminum nitride powders and 0.03 to 1 part by mass of a sintering auxiliary agent for aluminum nitride which consists of a compound containing Y, and a firing step for firing the substrate prepared in the previous step to sinter the layer, wherein in the firing step, firing is carried out such that volatilization of the sintering auxiliary agent contained in the composition is inhibited by increasing a partial pressure of sintering auxiliary agent vapors contained in an atmosphere in a vicinity of the layer during firing.