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Title: Method of producing high purity zirconia powder from zircon powder

Abstract

A method is described of producing a zirconia powder from zirconia containing SiO/sub 2/, comprising the steps of: preparing a raw material mixture comprising the zircon powder containing the SiO/sub 2/ and a powdery carbon-containing material such that the mole ratio of C, which is contained in the carbon-containing material and does not gasify at temperatures below 100/sup 0/C. in a nonoxidizing atmosphere, to SiO/sub 2/ contained in the zircon powder is in the range from 0.4 to 2.0; and subjecting the raw material mixture to a desiliconizing heat treatment in a nonoxidizing atmosphere of which the presence is not higher than 0.6 atm, the desiliconizing heat treatment being a combination of a first-stage heat treatment which is performed at a temperature in the range from 1200/sup 0/ to 1550/sup 0/C. for separating silica from the zircon powder and a second-stage heat treatment which is performed at a higher temperature in the range from above 1550/sup 0/C. to 2000/sup 0/C. for completely converting silica in the mixture under heat treatment into gaseous SiO and dissipating the gaseous SiO, wherein the raw material mixture is subjected to the desiliconizing heat treatment in the form of at least one lump whose bulkmore » density is in the range from 0.7 to 2.0.« less

Inventors:
; ; ;
Publication Date:
OSTI Identifier:
6810630
Alternate Identifier(s):
OSTI ID: 6810630
Patent Number(s):
US 4755365
Application Number:
TRN: 88-035711
Assignee:
Kawasaki Steel Corp., Hyogo NOV; NOV-88-027103; EDB-88-178259
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 1 Oct 1986
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ZIRCONIUM OXIDES; SYNTHESIS; CARBON COMPOUNDS; DENSITY; HEAT TREATMENTS; MIXTURES; OXIDATION; POWDERS; PRODUCTION; VERY HIGH TEMPERATURE; ZIRCONIUM; CHALCOGENIDES; CHEMICAL REACTIONS; DISPERSIONS; ELEMENTS; METALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; ZIRCONIUM COMPOUNDS 360201* -- Ceramics, Cermets, & Refractories-- Preparation & Fabrication

Citation Formats

Funahashi, T., Uchimura, R., Oguchi, Y., and Ueda, K. Method of producing high purity zirconia powder from zircon powder. United States: N. p., 1988. Web.
Funahashi, T., Uchimura, R., Oguchi, Y., & Ueda, K. Method of producing high purity zirconia powder from zircon powder. United States.
Funahashi, T., Uchimura, R., Oguchi, Y., and Ueda, K. Tue . "Method of producing high purity zirconia powder from zircon powder". United States.
@article{osti_6810630,
title = {Method of producing high purity zirconia powder from zircon powder},
author = {Funahashi, T. and Uchimura, R. and Oguchi, Y. and Ueda, K.},
abstractNote = {A method is described of producing a zirconia powder from zirconia containing SiO/sub 2/, comprising the steps of: preparing a raw material mixture comprising the zircon powder containing the SiO/sub 2/ and a powdery carbon-containing material such that the mole ratio of C, which is contained in the carbon-containing material and does not gasify at temperatures below 100/sup 0/C. in a nonoxidizing atmosphere, to SiO/sub 2/ contained in the zircon powder is in the range from 0.4 to 2.0; and subjecting the raw material mixture to a desiliconizing heat treatment in a nonoxidizing atmosphere of which the presence is not higher than 0.6 atm, the desiliconizing heat treatment being a combination of a first-stage heat treatment which is performed at a temperature in the range from 1200/sup 0/ to 1550/sup 0/C. for separating silica from the zircon powder and a second-stage heat treatment which is performed at a higher temperature in the range from above 1550/sup 0/C. to 2000/sup 0/C. for completely converting silica in the mixture under heat treatment into gaseous SiO and dissipating the gaseous SiO, wherein the raw material mixture is subjected to the desiliconizing heat treatment in the form of at least one lump whose bulk density is in the range from 0.7 to 2.0.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {7}
}