Title:
HIGHLY ZIRCONIA-BASED REFRACTORY AND MELTING FURNACE
Document Type and Number:
WIPO Patent Application WO/2010/116960
Kind Code:
A1
Abstract:
A highly zirconia-based refractory suitable for use in electric melting furnaces which has a high electrical resistivity at high temperatures and does not exhibit a chipping-off phenomenon in which the refractory surface partially chips off at elevated temperatures and which, even when in contact with a molten low-alkali glass, is reduced in the extraction of components therefrom and, hence, rarely cracks during operation.
The highly zirconia-based refractory comprises, as chemical components, 85-95 mass% ZrO2 in terms of inner percentage, 3.0-10 mass% SiO2 in terms of inner percentage, and 0.85-3.0 mass% Al2O3 in terms of inner percentage, contains substantially no Na2O, and contains 0.01-0.5 mass% K2O in terms of outer percentage, 1.5-3.0 mass% SrO in terms of inner percentage, and 0.1-2.0 mass% Nb2O5 and/or Ta2O5 in terms of the inner percentage of the value of {(Nb2O5 content)+(Ta2O5 content)/1.66}.
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Inventors:
SATO, Hironori (Limited 12-1, Yurakucho 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
Application Number:
JP2010/056097
Publication Date:
October 14, 2010
Filing Date:
April 02, 2010
Export Citation:
Assignee:
ASAHI GLASS COMPANY, LIMITED (12-1, Yurakucho 1-chome Chiyoda-k, Tokyo 05, 〒1008405, JP)
旭硝子株式会社 (〒05 東京都千代田区有楽町一丁目１２番１号 Tokyo, 〒1008405, JP)
旭硝子株式会社 (〒05 東京都千代田区有楽町一丁目１２番１号 Tokyo, 〒1008405, JP)
International Classes:
C04B35/48; B28B3/00; C03B5/43; C04B35/657; F27D1/00
Attorney, Agent or Firm:
SENMYO, Kenji et al. (4th Floor, SIA Kanda Square 17, Kanda-konyacho, Chiyoda-k, Tokyo 35, 〒1010035, JP)
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