Method of making an aluminum cylinder heat valve seat...

Details Method of making an aluminum cylinder heat valve seat... Method of making an aluminum cylinder heat valve seat...

B - Operations, Transporting

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B22D 21/04 (2006.01) B22D 15/02 (2006.01) B22D 19/00 (2006.01)

Patent

CA 1057932

METHOD OF MAKING AN ALUMINUM CYLINDER HEAT VALVE SEAT COATING TRANSPLANT ABSTRACT OF THE DISCLOSURE A method of making aluminum castings having a self-fused high silicon content in the interior matrix near and at the surface. A sand core is coated with a tacky, low-ash, low-volatile adhesive along a predetermined zone. Silicon dust particles are deposited on said adhesive in bonded relation. Molten aluminum is cast into a mold cavity containing the coated core. After mold stripping, the silicon particles are exposed as metallurgically bonded to the aluminum but along an ultrathin depth. At least some of the exposed silicon particles are machined to expose a planar facet and thereby increase the projected exposure of the silicon particles along the machined plane. The resulting product has a reduced shrinkage characteris- tic (typical of aluminum alloys having a high proportional precipitated silicon). - 1 -

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