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1. US4791978 - Gas permeable stopper rod

Office
United States of America
Application Number 07125636
Application Date 25.11.1987
Publication Number 4791978
Publication Date 20.12.1988
Grant Number 4791978
Grant Date 20.12.1988
Publication Kind A
IPC
B72D 11/10
B22D 11/10
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
11Continuous casting of metals, i.e. casting in indefinite lengths
10Supplying or treating molten metal
B22D 41/14
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
41Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
14Closures
B22D 41/18
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
41Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
14Closures
16stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
18Stopper-rods therefor
CPC
B22D 41/186
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
41Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
14Closures
16stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
18Stopper-rods therefor
186with means for injecting a fluid into the melt
Applicants Vesuvius Crucible Company
Inventors Fishler Mark K.
Agents Webb, Burden, Ziesenheim & Webb
Title
(EN) Gas permeable stopper rod
Abstract
(EN)

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.