Self-lubricating composite material layer, preparation method and component with self-lubricating function

Abstract

The invention discloses a self-lubricating composite material layer, a preparation method and a component with a self-lubricating function. The self-lubricating composite material layer is prepared from, by mass, 5-20% of graphite powder, 5%-20% of MoS2, 3%-10% of W powder, 1%-5% of Ti powder, 40%-60% of Ni powder and 10%-15% of Cr powder. In the laser cladding process of the particle mixture, on the one hand, part of graphite reacts with W, Cr and Ti so that new phase carbide can be formed, and besides, through solution strengthening of the Mo element, the strength of a coating is improved; on the other hand, MoS2 and chrome generate sulfide of a high-temperature solid lubricating agent, and excellent lubricating performance is achieved at high temperature; and in addition, the residual simple substance graphite not involved in the reaction serves as an excellent room temperature solid lubricating agent. Thus, an intake valve has excellent abrasion resistance and oxidation resistance and further has excellent lubricating function at both high temperature and low temperature, and the lubricating condition of the intake valve is greatly improved.

Description

technical field [0001] The invention relates to the technical field of friction, in particular to a self-lubricating composite material, a preparation method and components with self-lubricating functions. Background technique [0002] The intake valve of an automobile is a typical component that requires wear resistance. Please refer to figure 1 , the intake valve is composed of a head and a rod, the head cooperates with the valve seat to seal the cylinder, and opens and closes regularly according to the requirements of the working cycle, so that fresh air enters the cylinder; the rod cooperates with the valve guide as Movement of the valves provides guidance. [0003] During the working process, the intake valve can move up and down, and the movement is accompanied by rotation. During the movement, the intake valve, the valve guide and the valve seat ring are all worn. At present, due to the working environment of the engine intake valve, the leakage of lubricating oil ...

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned ceramic reinforced composite coating improves the surface hardness of the intake valve, the intake valve still frequently suffers from wear and tear failure problems during the product use process

Especially for large diesel engines with high power and high load, the intake valve failure frequency is relatively high, which seriously affects the working performance of the engine, and then affects the overall performance of the whole machine

Images