Gas permeable stopper rod

Details Gas permeable stopper rod Gas permeable stopper rod

1987-11-25

1988-12-20

Lin, Kuang Y.

Metal founding

Means to shape metallic material

Continuous or semicontinuous casting

164415, 222602, 266272, 266220, B72D 1110

Patent

active

047919787

ABSTRACT:
A one-piece carbon-bonded graphite refractory stopper rod for use in continuous casting of molten metal includes a copressed body portion with an integral porous nose section. Through a gap grain sizing technique, the mean pore size of the nose is controlled to preferably about 10 microns to permit an inert gas introduced into the rod to permeate therethrough as a fine dispersion of bubbles in the melt while preventing reverse permeation of molten metal in the event of depressurization of the gas supply. Improved erosion resistance of the nose and lower alumina deposition in the casting nozzle are also achieved.

REFERENCES:
patent: 1085181 (1914-01-01), Teeter
patent: 3033550 (1962-05-01), Harders
patent: 3625721 (1971-12-01), Snyder et al.
patent: 4064925 (1977-12-01), Fastner et al.
patent: 4588112 (1986-05-01), Kondo
patent: 4691901 (1987-09-01), Dobner

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