Process for producing a grain refining master alloy

Details Process for producing a grain refining master alloy Process for producing a grain refining master alloy

2011-08-02

2011-08-02

Wyszomierski, George (Department: 1733)

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C075S010490, C075S010650, C148S437000

Reexamination Certificate

active

07988764

ABSTRACT:
A process is provided for producing an aluminium-titanium-boron grain refining master alloy containing titanium boride and titanium aluminide particles, the process comprising melting aluminium in a silicon carbide crucible in a medium frequency induction or an electric resistance furnace, adding to the melt at a temperature between 750 degrees Celsius and 900 degrees Celsius, KBF4and K2TiF6salts, pre-mixed in proportions to obtain a Ti/B ratio of 5 in the melt, gently mixing the salt mixture with the melt without introducing any stirring, transferring the molten alloy to an electric resistance furnace maintained at 800 degrees Celsius, decanting the K—Al—F salt, the by-product of the salt reaction, thoroughly stirring the molten alloy in the SiC crucible with graphite rods before finally casting the molten alloy into cylindrical molds in the form of billets and finally extruding the billet into 9.5 mm rods.

REFERENCES:
patent: 5100618 (1992-03-01), Dewing et al.
patent: 5484493 (1996-01-01), Young et al.
patent: 2003/0075020 (2003-04-01), Hotz et al.
patent: 0396388 (1990-11-01), None

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