Refractory for use in casting operations

Details Refractory for use in casting operations Refractory for use in casting operations

1994-06-30

1996-04-09

Marcantoni, Paul

Compositions: ceramic

Ceramic compositions

Refractory

501121, 501122, 501128, 106692, C04B 3510

Patent

active

055061818

ABSTRACT:
A refractory of the invention is used in casting operation, which has good spalling resistance and corrosion resistance. The refractory includes: 0.0357-2.6548 wt % of amorphous silica particles having a specific surface area within a range of 15-30 m.sup.2 /g; 8.8495-28.5612 wt % of alumina particles having a particle diameter within a range of 10-50 mm; 1.3986-18.1715 wt % of at least one of fused magnesia and sintered magnesia, which contains 0.6993-10.9041 wt % of magnesia having a maximum particle diameter under 44 .mu.m; 0.6993-13.630 wt % of alumina cement; and 45.4545-88.1417 wt % of alumina. When the refractory is used, at lease one of fused magnesia and sintered magnesia surrounds the alumina particles, which react together to generate spinel to thereby form micro-crack layer around the alumina particles for preventing propagation of cracks in a refractory structure.

REFERENCES:
patent: 5283215 (1994-02-01), Hosokawa et al.
Japanese Patent Abstract--"Monolithic Refractory for Ladle", JP 05-185202, Koyago et al. (Jul. 27, 1993).
Japanese Patent Abstract--"Monolithic Refractory For Casting", JP 03-23275, Kawaso et al. (Jan. 31, 1991).

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