Method of producing a ceramic circuit substrate

Details Method of producing a ceramic circuit substrate Method of producing a ceramic circuit substrate

1997-03-25

1999-01-05

Mayes, Curtis

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156277, 29851, 264619, 264620, B32B 3126

Patent

active

058557113

ABSTRACT:
A ceramic circuit substrate providing a circuit pattern with a fine line as well as high accuracy for positioning the circuit pattern and a method of producing the ceramic circuit substrate. An alumina layer that is green containing an alumina that is not sintered at a temperature ranging from 800.degree. to 1000.degree. C. is applied on a surface of a ceramic green sheet containing glass and then fired at a temperature ranging from 800.degree. to 1000.degree. C. The ceramic green sheet is sintered into a sintered ceramic substrate. A porous alumina layer is formed on a surface of the sintered ceramic substrate. The glass contained in the sintered ceramic substrate is caused to flow to the inside of the porous alumina layer so that the part of the porous alumina layer filled with the glass is bonded to the sintered ceramic substrate. The part of the porous alumina layer not filled with the glass is removed, wherein the porous alumina layer remaining on the sintered ceramic substrate after the removing has a thickness of 10 .mu.m or less. A paste for forming the circuit pattern is printed on a surface of the part of the porous alumina layer that has been bonded to the sintered ceramic substrate for heating.

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