Patent ID: 9374893
Filing Date: 2016-06-21
CPC Classification: H01B,H05K

Claim Text:
1. A production method of a metallized substrate comprising a wiring pattern, the metallized substrate comprising: a sintered nitride ceramic substrate; a titanium nitride layer formed on the sintered substrate; and a metal layer being the wiring pattern and containing copper, silver and titanium formed on the titanium nitride layer, the method comprising: a step of layering a first paste layer by means of a first paste composition containing copper powder and titanium hydride powder and having a thixotropic index of 0.2 to 1.0 on a part of the sintered nitride ceramic substrate, to produce a first layered body, wherein the part of the sintered nitride ceramic substrate is a part where the wiring pattern is to be formed, and wherein the copper powder is a mixed powder of copper powder A having an average particle size of 0.1 μm or more and less than 1.0 μm and copper powder B having an average particle size of 1.0 to 5.0 μm; a step of layering a second paste layer by means of a second paste composition containing silver-copper alloy powder and not containing a titanium component on the first paste layer of the first layered body, to produce a second layered body, wherein the silver-copper alloy powder has a melting point of 630 to 850° C. and an average particle size of 0.1 to 20 μm; and a step of firing the second layered body, at a temperature such that the second paste composition melts wherein the temperature is not greater than melting point of copper and wherein the firing is carried out under a condition such that a shape of the first paste layer is maintained, to thereby form the titanium nitride layer and the metal layer on the sintered nitride ceramic substrate.