Fused refractory

Details Fused refractory Fused refractory

1978-07-10

1979-06-19

Poer, James

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

C04B 3510, C04B 3512

Patent

active

041585690

ABSTRACT:
Dense fused cast product and fused grain product of material whose microstructure consists essentially of at least 70 volume % chrome-containing corundum solid solution crystal phase, at least about 5 volume % oxidic secondary crystal phases mainly comprising chrome-containing alkaline earth hexaluminate solid solution, and less than 10 volume % metal phase. Analytical composition of material, by weight, consists essentially of at least 90% Al.sub.2 O.sub.3 +Cr.sub.2 O.sub.3, 20-60% Cr.sub.2 O.sub.3, 1-4% MO where M is Ca, Ba, Sr, Mg, Fe and mixtures thereof, 0.4-3.5% CaO, BaO, SrO and mixtures thereof, not greater than 3% MgO, not greater than 3.5% FeO, <5% SiO.sub.2, up to 0.5% fluorine, <1.5% R.sub.2 O wherein R is Li, Na, K, Rb, Cs and mixtures thereof, up to 2% TiO.sub.2 and up to 3% ZrO.sub.2. Resistant to corrosion by soda-lime and borosilicate glasses. Notable electrical resistivity with SiO.sub.2 <1% by weight.

REFERENCES:
patent: 2063154 (1936-12-01), Easter et al.
patent: 2279260 (1942-04-01), Benner et al.
patent: 2911313 (1959-11-01), Sandmeyer

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