Monoclinic zirconium dioxide, method of its production and use

Details Monoclinic zirconium dioxide, method of its production and use Monoclinic zirconium dioxide, method of its production and use

1992-02-27

1994-06-07

Brunsman, David

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

501 95, 501103, 106450, C01G 2502, C04B 3548

Patent

active

053187652

ABSTRACT:
A monoclinic zirconium dioxide with an SiO.sub.2 content below 1.0% by weight is provided which is characterized by dendrite-shaped particles with an average grain size (d.sub.50 value) in a range of 0.5 .mu.m to 3.0 .mu.m and a specific surface (BET) in a range of 3 to 15 m.sup.2 /g. This zirconium dioxide is produced by thermally splitting zirconium silicate in a high-frequency- or medium-frequency induction melting furnace with sintering crust crucible, quenching the melt by blowing on a stream of melt with air and/or spraying it with water and leaching out the thermally split zirconium silicate with concentrated alkali lye at 100.degree. 200.degree. C. The zirconium dioxide of the invention provides a material with improved suitability for the production of zirconium silicate pigments of the host lattice type and inclusion type so as to provide for more color-intensive pigments.

REFERENCES:
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patent: 4279655 (1981-07-01), Garvie et al.
patent: 4829028 (1989-05-01), Seki et al.
patent: 5011673 (1991-04-01), Kriechbaum
patent: 5169809 (1992-12-01), Brenna et al.
"Zirconia Production Stepped Up," Ceramics, Feb. 1974, p. 30.
W. C. Butterman et al., Amer. Mineralogist 52 (1967) p. 884.

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