Method of casting hypereutectic aluminum-silicon alloys...

Details Method of casting hypereutectic aluminum-silicon alloys... Method of casting hypereutectic aluminum-silicon alloys...

B - Operations, Transporting

22

D

B22D 21/04 (2006.01) B22D 17/24 (2006.01) B22D 21/00 (2006.01) B22D 29/00 (2006.01)

Patent

CA 2078969

-10- METHOD OF CASTING HYPEREUTECTIC ALUMINUM-SILICON ALLOYS USING A SALT CORE Abstract of the Disclosure A method of high pressure casting of hypereutectic aluminum-silicon alloys using a salt core to form wear resistant articles, such as engine blocks. To produce an engine block, one or more solid salt cores are positioned within a metal mold with the space between the cores and the mold defining a die cavity. A molten hypereutectic aluminum-silicon alloy containing more than 12% silicon is fed into the die cavity and on solidification of the molten alloy, precipitated silicon crystals are formed, which are distributed throughout the wall thickness of the cast part and also on the surface bordering the salt cores which constitute the cylinder bores in the cast block. The salt cores are subsequently removed from the cast block by contact with a solvent such as water.

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