Patent ID: 6329065
Filing Date: 2001-12-11
Classification: B32B,C04B,H01L,H05K,Y10S,Y10T

Abstract:
A wiring board having an insulating substrate of aluminum oxide ceramics and a surface wiring layer formed on a surface of said insulating substrate;wherein the aluminum oxide ceramics constituting said insulating substrate contains a manganese compound in an amount of from 2.0 to 10.0% by weight in terms of MnO.sub.2, and has a relative density of not smaller than 95%; andsaid surface wiring layer contains copper in an amount of from 10 to 70% by volume and at least one high-melting metal selected from the group consisting of tungsten and molybdenum in an amount of from 30 to 90% by volume, wherein the copper forms a matrix having a diffusion structure in which are diffused particles of said high-melting metal having an average particle diameter of from 1 to 10 .mu.m.