Gas-permeable refractory parts

Details Gas-permeable refractory parts Gas-permeable refractory parts

1979-06-12

1980-12-02

Poer, James

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 40R, 106104, C04B 3502, C04B 2112

Patent

active

042369312

ABSTRACT:
The invention relates to gas-permeable parts comprised, by weight, of (A) 60 to 90% of granules of a grain size from 5 mm to 0.2 mm formed from a material selected among the group consisting of a chamotte containing at least 42% of Al.sub.2 O.sub.3, mullite, fired gibbsite containing more than 90% Al.sub.2 O hd 3, sintered or fused cast corundum containing more than 95% Al.sub.2 O.sub.3, natural chromite, sintered MgO, zircon sand and stabilized zirconia, and (B) 10 to 40% of a bonding cement comprised a calcium aluminate, a material selected among SiO.sub.2, Al.sub.2 O.sub.3 and Cr.sub.2 O.sub.3 having a particle size between 100 A and 0.1 micron, and alumina having a particle size between 1 and 100 microns. These parts retain a high mechanical strength when heated between hydraulic setting and ceramization, and are useful for blowing a gas therethrough in order to stir molten steel and cast iron.

REFERENCES:
patent: 3060043 (1962-10-01), Renkey
patent: 3753746 (1973-08-01), Koerner
patent: 3802894 (1974-04-01), Prost et al.
patent: 3884709 (1975-05-01), Hay
patent: 4102695 (1978-07-01), Claverie
patent: 4111711 (1978-09-01), Kiehl et al.

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