Compositions – Magnetic – Iron-oxygen compound containing
Patent
1978-06-12
1979-02-20
Vertiz, O. R.
Compositions
Magnetic
Iron-oxygen compound containing
252 6259, 252 626, 252 6261, 106 396, 106 397, C03C 322, C04B 3514, C04B 3526, H01F 134
Patent
active
041406451
ABSTRACT:
The instant invention relates to the production of glass and glass-ceramic compositions containing a ferrimagnetic crystal phase throughout which respond thermally to fields generated by induction coils. Magnetite (Fe.sub.3 O.sub.4) is the preferred ferrimagnetic crystal phase because of its high permeability and low resistivity (.about.10.sup.-4 ohm-cm) at room temperature as well as the relative low cost of iron when compared with other ferrimagnetic species. Two general composition areas are of interest: Na.sub.2 O and/or K.sub.2 O-FeO-B.sub.2 O.sub.3 -SiO.sub.2 and Li.sub.2 O-Al.sub.2 O.sub.3 -B.sub.2 O.sub.3 -SiO.sub.2. Where the coefficient of thermal expansion is sufficiently low to impart good thermal shock resistance, the compositions can be considered for top-of-stove cooking vessels.
REFERENCES:
patent: 3193503 (1965-07-01), Smith
patent: 3694360 (1972-09-01), Weaver
patent: 3741740 (1973-06-01), Pirooz
patent: 3926602 (1975-12-01), Andrus
patent: 4042519 (1977-08-01), Weaver
patent: 4043821 (1977-08-01), LeBras
patent: 4083709 (1978-04-01), Reade
patent: 4083727 (1978-04-01), Andrus et al.
Beall George H.
Reade Richard F.
Bell Mark
Corning Glass Works
Janes Jr. Clinton S.
Vertiz O. R.
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