Patent ID: 7988764

Claim:
A method to produce Al—Ti—B grain refiner master alloys with Al 3 Ti particles smaller than 20 microns and TiB 2 particles with an average size of less than 1 micron, dispersed in an aluminium matrix, comprising: a. Melting of aluminium to form molten aluminium, b. Addition of pre-mixed KBF 4 and K 2 TiF 6 salts into said molten aluminium at once to facilitate a rapid salt reaction, to form a molten alloy, and achieve 1-10% Ti and 0.2-2.0% B in said molten alloy, c. Gently mixing these halide salts with said molten aluminium without introducing any stirring, d. Holding the molten alloy after completion of the salt reaction for 15 to 120 minutes, in an electric resistance furnace, leaving molten K—Al—F salt, the by-product of the salt reaction, on the molten alloy without introducing any stirring, in order to avoid oxidation of the molten alloy, e. Decanting said molten K—Al—F salt at the end of holding, f. Casting the molten alloy into a permanent mold after stirring it thoroughly.