Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1992-06-24
1993-12-28
Group, Karl
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
360119, 360120, 360126, 360103, 360104, 501 74, C03C 3072, C03C 3102, C03C 3105
Patent
active
052739481
ABSTRACT:
A bonding glass for assembling a magnetic head by bonding a magnetic core to a non-magnetic ceramic slider. The magnetic core has a gap and an Fe-Al-Si film within the gap. The bonding glass includes SiO.sub.2 in the range of 6 to 11 wt %, B.sub.2 O.sub.3 in the range of 5 to 9 wt %, Al.sub.2 O.sub.3 in the range of 2 to 5 wt %, PbO in the range of 55 to 70 wt %, Bi.sub.2 O.sub.3 in the range of 5 to 15 wt %, TeO.sub.2 in the range of 1 to 10 wt % and CuO in the range of 0.5 to 2 wt %. A part of the PbO in PbO-SiO.sub.2 -B.sub.2 O.sub.3 -Al.sub.2 O.sub.3 glass is replaced with TeO.sub.2 and Bi.sub.2 O.sub.3 and, at the same time, CuO is added in order to prevent the formation of a heterophase. Glass color change under high temperature and high humidity is prevented.
REFERENCES:
patent: 4997796 (1991-03-01), Toyoshima et al.
patent: 5029032 (1991-07-01), Yamada et al.
Chem. Abstract 108:136470j correspond to EPA 254198; Jan. 27, 1988.
Chem. Abstract 112:123984n correspond to JP 01-203240, Aug. 16, 1989.
Noguchi Kazumi
Yamazaki Masanobu
Bonner C. M.
Group Karl
Hitachi Metals Ltd.
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