Composite coating for surface of engine connecting rod, preparation method of composite coating and engine connecting rod

Abstract

The invention discloses a composite coating for the surface of an engine connecting rod, a preparation method of the composite coating and the engine connecting rod. The composite coating for the engine connecting rod surface is positioned on the joint surface of the connecting rod large end cover and the connecting rod body; the composite coating is arranged on a metal base material, and the composite coating comprises a transition layer and a multi-element metal coating which are sequentially arranged on the metal base material. The composite coating has high hardness, low surface roughness and high bonding strength, the hardness of the surface of the connecting rod can be effectively improved, the surface friction coefficient is reduced, tangential stress caused by friction force is reduced, stress distribution of the contact surface is reduced, the fretting wear phenomenon is relieved, the service life of the connecting rod is effectively prolonged, and the service life of the connecting rod is prolonged. The method is especially suitable for high-strengthening-index engine connecting rods.

Description

technical field [0001] The application relates to the technical field of engine connecting rods, in particular to a composite coating for the surface of an engine connecting rod, a preparation method thereof, and an engine connecting rod. Background technique [0002] The connecting rod is one of the core parts of the engine. Its function is to transmit the force of the piston to the crankshaft, so that the reciprocating motion of the piston is converted into the rotational motion of the crankshaft. The connecting rod bears high periodic impact force and inertial force in working engineering. The connecting rod is mainly composed of a connecting rod shaft, a large end cover of the connecting rod, a connecting rod stud and a nut. [0003] With the continuous improvement of engine strengthening indicators, high power density and high reliability have become the main direction of design. With the further improvement of the strengthening index, the alternating mechanical load ...

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Problems solved by technology

[0004] At present, the material of the connecting rod and the big end joint surface commonly used in the engine field is usually the same material as the connecting rod body, which cannot solve the problem of fretting wear on the large end joint surface of the connecting rod under high mechanical load

[0005] Therefore, it is urgent to provide a composite coating with high hardness and high wear resistance on the joint surface of the connecting rod to solve the problem of fretting wear on the joint surface of the large end of the connecting rod

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