Low temperature fired ceramics

Details Low temperature fired ceramics Low temperature fired ceramics

1986-10-16

1988-06-07

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 15, 501 17, 501 65, 501 66, 501 69, 501 70, 501 72, C03C 1400, C03C 814, C03C 824

Patent

active

047496657

ABSTRACT:
Partially crystallized ceramic articles is prepared by firing at low temperatures of 800.degree. to 1100.degree. C., a mixture consisting essentially of, (a) 40 to 50 wt. % of powdered, noncrystalline glass consisting essentially of 10 to 55 wt. % of at least one selected from the group consisting of CaO and MgO, 45 to 70 wt. % of SiO.sub.2, 0 to 30 wt. % of Al.sub.2 O.sub.3, 0 to 30% of B.sub.2 O.sub.3 and up to 10% impurities, the powder size of said glass being at least 4.0 m.sup.2 /g in terms of specific surface area measured by the BET Method; and (b) 60 to 50 wt. % of powdered Al.sub.2 O.sub.3 and the ceramic article is composed essentially of a noncrystallized glass phase, alumina and at least one of crystallized glass phase among anorthite, wollastonite, cordierite and mullite formed by partially crystallizing the glass (a). The ceramic articles exhibit a very high flexural strength well comparable with alumina substrate, together with greatly improved dielectric constant and thermal expansion and thus are especially useful in making multi-layer ceramic substrates for electronic applications.

REFERENCES:
patent: 3380838 (1968-04-01), Sack et al.
patent: 4301324 (1981-11-01), Kumar et al.
patent: 4621066 (1986-11-01), Nishigaki et al.
Copy of U.S. Ser. No. 449 564, filed Mar. 8, 1974.

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