Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1994-03-29
1996-03-12
Group, Karl
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 32, 501 66, C03C 1008, C03C 1400
Patent
active
054985803
ABSTRACT:
The ceramic substrate comprising a glass and a crystal is characterized by the glass comprising a MgO--Al.sub.2 O.sub.3 --SiO.sub.2 --B.sub.2 O.sub.3 --R.sub.2 O-base glass(R:alkali metal) and containing a 2MgO.2Al.sub.2 O.sub.3.5SiO.sub.2 crystal (cordierire) as the crystal. Due to the composition, the softening point of the glass becomes less than 720.degree. C. and the porosity decreases, so that the substrate can be dense. As a result, the coefficient of thermal expansion thereof can be close to silicon, the specific inductive capacity thereof can be small and the substrate can be excellent in transverse strength, moisture resistance, water resistance, etc. And, due to the lowered softening point, a ceramic substrate having the above characteristics can be produced even by sintering at between 800.degree. C. and 1000.degree. C., and ceramic substrate having an inner circuit interconnection made of Ag or Cu, etc. can be produced.
REFERENCES:
patent: 4749665 (1988-06-01), Yano et al.
patent: 4764233 (1988-08-01), Ogihara et al.
patent: 4997795 (1991-03-01), Hang et al.
patent: 5024975 (1991-06-01), Hartmann
patent: 5190895 (1993-03-01), Uchida et al.
patent: 5356841 (1994-10-01), Mizutani et al.
Moriya Yoichi
Yamade Yoshiaki
Group Karl
Sumitomo Metal Industries Ltd.
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