High resistivity refractory with a high zirconia content

Details High resistivity refractory with a high zirconia content High resistivity refractory with a high zirconia content

2007-08-24

2010-02-02

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

Refractory

C501S107000

Reexamination Certificate

active

07655587

ABSTRACT:
The invention provides a novel fused and cast refractory product with a high zirconia content having improved electrical resistivity. Said refractory product comprises, as a percentage by weight relative to the oxides and for a total of more than 98.5%:ZrO2+Hf2O: >85%SiO2: 1% to 12%Al2O3: 0.1% to 2.4%, with Al2O3/SiO2<0.5Y2O3: ≦1%,B2O3: <1.5%; anda dopant selected from the group formed by V2O5, CrO3, Nb2O5, MoO3, Ta2O5, WO3, and mixtures thereof, in a weighted quantity such that:in-line-formulae description="In-line Formulae" end="lead"?0.2%≦2.43V2O5+8.84CrO3+1.66Nb2O5+6.14MoO3+Ta2O5+3.81WO3.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 5028572 (1991-07-01), Kim et al.
patent: 5466643 (1995-11-01), Ishino et al.
patent: 2009/0038936 (2009-02-01), Boussant-Roux et al.
patent: 2000-302560 (2000-10-01), None

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