Flux combination of barium oxide and potassium feldspar for high

Compositions: ceramic – Ceramic compositions – Clay containing

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501153, 501127, C04B 3326

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active

043329136

ABSTRACT:
Disclosed is an alumina porcelain composition, suitable for use after firing to form electric insulators, comprising from about 40 to 65% by weight of calcined alumina, from about 15 to 40% by weight of plastic kaolinite-montmorillonite constituents, and from about 20 to 26% by weight of a flux combination which contains alkali-aluminum silicates and from about 0.1 to 5% by weight of one or more alkaline earth oxides, preferably in the form of alkaline earth compounds. The flux combination preferably comprises about 22 to 24% by weight of potassium-aluminum silicates and from about 0.2 to 2.5% by weight of barium oxide in the form of barium compounds, thus avoiding the disadvantages associated with the use of TiO.sub.2 and MnO.sub.2.

REFERENCES:
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patent: 4204874 (1980-05-01), Yamada
patent: 4226635 (1980-11-01), Kindrick
Blodgett, W. E. "High Strength Alumina Porcelains", Cer. Bull. '(1961), pp. 74-77.
Extremely High Strength Porcelain, Prepared by McGraw-Edison Co., Apr. 1978, EL-722 Research Project 427-1, pp. 1-19, 4-20, 4-21, 4-40 and 4-43.
Improvement of Electrical Porcelain Insulators, Prepared by Gould, Inc., EL-721-SY Research Project 424-1, pp. 1-13.

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