Patent ID: 9504166
Filing Date: 2016-11-22
CPC Classification: B24C,H01L,H05K,Y10T

Claim Text:
1. A process for producing a substrate for mounting element, comprising: forming a substrate having a thick conductor layer made of a metal composed mainly of Ag or Cu, on a surface of an inorganic insulating substrate made of an inorganic insulating material; applying wet blast treatment to the thick conductor layer to planarize the surface of the thick conductor layer to a surface roughness Ra of at most 0.02 μm; and forming a Ni/Au-plated layer on the thick conductor layer having the surface planarized by the wet blast treatment, wherein the forming of the substrate comprises printing a metal paste composed mainly of Ag or Cu on a surface of the substrate made of a glass ceramics composition comprising a glass powder and a ceramics powder, to form a conductor pattern, and firing the substrate having the conductor pattern formed to sinter the glass ceramics composition and fire the metal paste thereby to form the thick conductor layer made of the metal.