Patent ID: 7687137
Filing Date: 2010-03-30
Classification: B32B,C03C,C04B,H05K,Y10T

Abstract:
1. An insulating substrate comprising: a laminated body including at least two kinds of glass-ceramics insulating layers, wherein crystallizable glass contained in a first insulating layer of the at least two kinds of glass-ceramics insulating layers and crystallizable glass contained in a second insulating layer thereof are different from each other, and a crystallization temperature of the crystallizable glass contained in the first insulating layer is higher than a softening point of the crystallizable glass contained in the first insulating layer, and a crystallization temperature of the crystallizable glass contained in the second insulating layer is higher than a softening point of the crystallizable glass contained in the second insulating layer, wherein the crystallization temperature of the crystallizable glass contained in the first insulating layer is lower than the softening point of the crystallizable glass contained in the second insulating layer, and wherein the first insulating layer contains celsian and further contains a plurality of different kinds of crystals selected from the group consisting of forsterite, mullite, willemite, cordierite, and gahnite, wherein the first insulating layer does not contain diopside; the second insulating layer contains diopside and further contains a plurality of different kinds of crystals selected from the group consisting of forsterite, hardestnite, willemite, spinel, and anorthite, wherein the second insulating layer does not contain celsian.