Composite manufacturing and stress releasing method for ceramic-coated cylinder sleeve of engine

Abstract

The invention discloses a composite manufacturing and stress releasing method for a ceramic-coated air cylinder sleeve of an engine. The composite manufacturing and stress releasing method specifically comprises the following steps that fine machining is conducted on transition layer pure copper or kovar alloy used for brazing, the transition layer pure copper or kovar alloy is matched with a cylinder sleeve, and a brazing filler metal filling gap is reserved; the gap between the cylinder sleeve and the transition layer is filled with brazing filler metal, the brazing filler metal is tightly matched with the transition layer and the cylinder sleeve, and the brazing filler metal is placed in a furnace for brazing after no obvious dislocation exists; the welded workpiece is subjected to finish machining, and a transition layer is thinned; and the ceramic is put into the cylinder sleeve after being pre-metalized, gaps are filled with brazing filler metal, and the ceramic is put into a furnace to be brazed after no dislocation exists. The engine ceramic-coated cylinder sleeve manufactured by the invention has the advantages of high thermal fatigue strength, no ceramic crack, difficulty in stripping and the like, the wear resistance, corrosion resistance, lubricity, cold and hot impact resistance and deformation resistance of the cylinder sleeve are improved, the fuel efficiency of an engine is improved, and the service life of the engine is prolonged.

Description

technical field [0001] The invention relates to a compound manufacturing and stress releasing method of an engine ceramic-coated cylinder liner, which belongs to the field of engine component manufacturing. Background technique [0002] Structural ceramics mainly refer to a large class of new ceramic materials that exert their mechanical, thermal, and chemical properties. It has superior strength, hardness, insulation, heat conduction, high temperature resistance, oxidation resistance, corrosion resistance, wear resistance, high temperature strength, etc. Therefore, it exhibits high stability in very harsh environments or engineering application conditions. It has attracted much attention in the material industry due to its high resistance and excellent mechanical properties. It is precisely because of such excellent characteristics that structural ceramics are often used to manufacture mechanical components such as bearings, gas turbine blades, mechanical seal rings, and p...

AI Technical Summary

Problems solved by technology

At the same time, due to the high-speed reciprocating motion of the piston in the cylinder and the poor lubrication conditions, the cylinder liner is severely worn. At present, the cylinder liner is usually made of alloy cast iron or ductile iron that is easy to cast and low in cost. The most widely used material is high phosphorus. Alloy cast iron or boron-containing cast iron has certain limitations in its wear resistance and denaturation resistance.

The existing technologies for improving the wear resistance of cylinder liners mainly include chrome plating on the inner surface, nitriding, ion nitriding, and spraying ceramic coatings. However, these technologies have complex processes, unstable surfaces, easy peeling, serious pollution and The problem of large deformation

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