Method of making an engine block using coated cylinder bore...

Details Method of making an engine block using coated cylinder bore... Method of making an engine block using coated cylinder bore...

C - Chemistry, Metallurgy

23

C

C23C 4/02 (2006.01) B22D 15/02 (2006.01) C23C 4/00 (2006.01) C23C 4/14 (2006.01) F02F 1/20 (2006.01) F02F 7/00 (2006.01) F16J 10/04 (2006.01) F02B 75/18 (2006.01) F02B 75/22 (2006.01)

Patent

CA 2164137

A method of making coated engine blacks by (a) casting a metallic engine block having one or more cylinder bores; (b) fabricating a thin walled liner for each bore, the liner being constituted of extruded metallic tubing having a cleansed inner surface, a wall thickness controlled to a thickness of 1-3mm 15 microns, the outer diameter of the liner being slightly greater than the internal diameter of the cylinder bores; (c) relatively rotating the liner with respect to one or more nozzles for applying a plurality of materials to the internal surface of the liner, the materials comprising first a metal texturing fluid that is applied at high pressures to expose fresh metal of the surface, secondly a bond coating material that is thermally sprayed to form a metallurgical bond with the liner internal surface, and a top coating of anti-friction material that is adheringly plasma sprayed to the bond coating; (d) honing the coated internal surface to remove up to 150 microns of top coating, leaving a finish surface that is concentric to the tube axis within 15 microns; and (e) interference fitting the coated liner to the cylinder bore by freezing the liner while maintaining the block at or above ambient temperature to permit implanting of the liner.

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