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

1990-04-25

1991-08-20

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428210, 428426, 428432, 428901, 361397, 361401, B32B 900

Patent

active

050413279

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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