Brennkraftmaschinenblock mit beschichteten Zylinderbüchsen

摘要

A method of making coated engine blacks by (a) casting a metallic engine block (10) having one or more cylinder bores (11); (b) fabricating a thin walled liner (12) for each bore (11), the liner (12) being constituted of extruded metallic tubing having a cleansed inner surface (14), 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 (15) that is thermally sprayed to form a metallurgical bond with the liner internal surface, and a top coating (16) of anti-friction material that is adheringly plasma sprayed to the bond coating (15); (d) honing the coated internal surface (14) 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 (12) to the cylinder bore (11) by freezing the liner while maintaining the block at or above ambient temperature to permit implanting of the liner.