Glasses and glass-ceramics suitable for induction heating

Details Glasses and glass-ceramics suitable for induction heating Glasses and glass-ceramics suitable for induction heating

C - Chemistry, Metallurgy

04

B

31/136, 49/77

C04B 35/14 (2006.01) C03C 14/00 (2006.01)

Patent

CA 1121587

GLASSES AND GLASS-CERAMICS SUITABLE FOR INDUCTION HEATING Abstract of the Disclosure The instant invention relates to the production of glass and glass-ceramic compositions containing a ferri- magnetic crystal phase throughout which respond thermally to fields generated by induction coils. Magnetite (Fe304) is the preferred ferrimagnetic crystal phase because of its high permeability and low resistivity (-10-4 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: Na2O and/or K2O-FeO- B2O3-SiO2 and Li2O-A12O3-B2O3-SiO2. Where the coefficient of thermal expansion is sufficiently low to import good thermal shock resistance, the compositions can be considered for top-of-stove cooking vessels.

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