Ceramic and circuit substrate and electronic circuit substrate b

Details Ceramic and circuit substrate and electronic circuit substrate b Ceramic and circuit substrate and electronic circuit substrate b

1988-06-16

1990-07-17

Ryan, Patrick

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428210, 428426, 428432, 428901, 361401, 174258, B32B 300

Patent

active

049420798

ABSTRACT:
A ceramic comprising a first region comprises a dielectric porcelain having an insulating layer at the crystal grain boundary of a semiconductor porcelain containing 0.50-5.30 mol parts of MnO.sub.2 and 0.02-0.40 mol parts of Y.sub.2 O.sub.3 per 100 mol parts of a principal components consisting of 49.50-54.00 mol % of TiO.sub.2 and 50.50-46.00 mol % of SrO, and a second region comprising a dielectric porcelain containing further 0.40-5.00 mol parts of Al.sub.2 O.sub.3, based on 100 mol parts of said principal components, in addition to the composition of the first region.

REFERENCES:
patent: 2648804 (1953-08-01), Steigerwalt et al.
patent: 4610969 (1986-09-01), Wada et al.
patent: 4610970 (1986-09-01), Wada et al.
patent: 4759965 (1988-07-01), Kato et al.

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