Glass powder which is crystallizable to yield a sintered glass c

Details Glass powder which is crystallizable to yield a sintered glass c Glass powder which is crystallizable to yield a sintered glass c

1993-02-09

1993-10-05

Group, Karl

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 57, 501 59, 501 69, C03C 1008, C03C 3112

Patent

active

052504743

ABSTRACT:
A glass powder crystallizable to yield a sintered glass ceramic containing hexagonal cordierite as the principal crystal phase is of the composition, in mol % on an oxide basis, of 48-61 SiO.sub.2 ; 10-16 Al.sub.2 O.sub.3 ; 23-35 MgO; 0-4 B.sub.2 O.sub.3 ; 0-2.5 P.sub.2 O.sub.5 ; 0.5-5 .SIGMA. B.sub.2 O.sub.3 +P.sub.2 O.sub.5 ; 0-3 ZnO; 0-3 CaO; 0-1.5 BaO and as an essential component 0.5-12 F as a substitute for O. The glass powder may also contain a total of up to 3 mol % of one or more of the oxides PbO, SrO and SnO.sub.2. The glass powder can be crystallized at sintering temperatures below 970.degree. C. in a relatively broad sintering temperature range to yield a sintered glass ceramic having excellent and constant properties. It is particularly suitable for the production of electrotechnical and electronic components since it has very good electrical, dielectrical and mechanical properties. The sintering conditions can be varied within relatively broad limits without any adverse effect on the product obtained.

REFERENCES:
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patent: 3940255 (1976-02-01), Harrington et al.
patent: 4540671 (1985-09-01), Kondo et al.
patent: 4764486 (1988-08-01), Ishihara et al.
patent: 4997795 (1991-03-01), Hang et al.
patent: 5099174 (1992-03-01), Coxon et al.
Chemical Abstracts, vol. 114, No. 18, May 6, 1991, Abstract No. 169810x.
Heidenreich et al., "Der Eiufluss von Fluor auf Phasentrennung, Kristallisation und Eigenschaften von Glasern im MgO-Al.sub.2 O.sub.3 -SiO.sub.2 -System", Silikattechnik, vol. 27, No. 12, Dec. 1976, pp. 402-405.

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