Gas stir plugs with slots and method of making the same

Details Gas stir plugs with slots and method of making the same Gas stir plugs with slots and method of making the same

1990-09-14

1992-04-14

Kastler, Scott

Metallurgical apparatus

Means for melting or vaporizing metal or treating liquefied...

By means introducing treating material

266265, C21C 700

Patent

active

051040972

ABSTRACT:
A stirring plug for introducing gas into a mass of molten metal and a method of making the plug. The plug is of a generally frusto-conical shape having a central axis and includes plural elongated slots formed of generally smooth walls extending between the top and bottom ends of the plug and arranged in a frustum array. Each of the slots has a predetermined cross sectional area in any plane perpendicular to the central axis. The method comprises providing a member having a hollow frusto-conical shape cavity and inserting plural wax coated steel tapes or plastic tapes in a frustom array therein. The cavity is then filled with a refractory castable mix and it is allow to air set to form a frusto-conical body. That body is then heated to an elevated temperature to form a dense ceramic plug. In the case of the plastic tapes the heating of the mix causes the tapes to melt or sublime to form the slots. In the case of the steel tapes after the mix has air set it is heated to a modest heat to melt the wax on the tapes so that they can be pulled from the mix to form the slots.

REFERENCES:
patent: 4438907 (1984-03-01), Kimura et al.
patent: 4535975 (1985-08-01), Buhrmann et al.
patent: 4560149 (1985-12-01), Hoffgen
patent: 4657226 (1987-04-01), Illemann et al.
patent: 4899992 (1990-02-01), Thrower et al.

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