Ceramic, circuit substrate and electronic circuit substrate by u

Details Ceramic, circuit substrate and electronic circuit substrate by u Ceramic, circuit substrate and electronic circuit substrate by u

1990-04-25

1992-04-07

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428220, 428426, 428433, 428901, 501 5, 501137, B32B 700

Patent

active

051027194

ABSTRACT:
The present invention provides a ceramic having a first region comprising a dielectric porcelain having an insulating layer at the crystal grain boundary of a semiconductor porcelain containing 0.50 to 5.30 mol parts of MnO.sub.2 and 0.02 to 0.40 mol parts of Y.sub.2 O.sub.3 per 100 mol parts of the principal components comprising 49.50 to 54.00 mol % of TiO.sub.2 and 50.50 to 46.00 mol % of SrO, and a second region comprising a dielectric porcelain containing further 0.40 to 5.00 mol parts of MgO and 0.05 to 2.00 mol parts of SiO.sub.2 per 100 mol parts of the principal components in addition to the composition of the first region, and also provides a circuit substrate and an electronic circuit substrate using the same ceramic.

REFERENCES:
patent: 2648804 (1953-08-01), Steigerwelt 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.
patent: 4943469 (1990-07-01), Kumagai et al.
patent: 4952538 (1990-08-01), Kumagai et al.

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