Self-lubricating wear-resistant steel antifriction layer material and preparation method thereof

Abstract

The invention belongs to the metallurgical material field, and in particular relates to a self-lubricating wear-resistant steel antifriction layer material for the bimetallic rotor and the sliding shoes of a plunger hydraulic pump, and a preparation method thereof, wherein the final product of the self-lubricating wear-resistant antifriction layer material is composed of the following components in percentage by mass: 0.5-1% of C, 11-13% of Cr, 8-10% of Ni, 1.5-2.5% of Mo, 25-30% of Cu, 3-9% of MoS2, 0.5-1.5% of nano alpha-Al2O3 and the balance of Fe; graphite powder, ferrochrome powder, ferromolybdenum powder, carbonyl nickel powder, molybdenum disulfide powder, nano alpha-Al2O3 powder and a binder are mixed with iron powder, and then the mixture is pressed and sintered, and finally dipped in copper. The results of frictional wear tests indicate that the abrasion loss of the self-lubricating wear-resistant steel antifriction layer material in kerosene is only 1 / 20 of that of silicon, manganese or brass.

Description

technical field [0001] The invention belongs to the field of metallurgical materials, in particular to a self-lubricating wear-resistant steel friction-reducing layer material and a preparation method thereof. Background technique [0002] The key friction pairs in the plunger hydraulic pump are: rotor and sliding shoe. They are subjected to alternating stress, impact load, surface friction and wear, and the chemical action of the medium, as well as the functions of force transmission, lubrication, and sealing, and the working conditions are the worst. In the development of new products, severe wear of key friction pairs or fractures caused by wear have become the main cause of pump failure. [0003] The high speed and high pressure of the pump will make the wear and fatigue problems of key friction pair materials more prominent: under high speed and high pressure, the surface of the friction pair will heat up rapidly, the contact surface will change and soften faster, and ...

AI Technical Summary

Problems solved by technology

[0005] However, the existing copper-steel bimetallic rotors and sliding shoes cannot meet the requirements of a new generation of high-pressure and large-flow hydraulic pumps, especially kerosene pumps. The main problems are:

[0006] ① Copper alloy anti-friction layer has limited wear resistance

Copper-steel bimetallic rotors have large differences in thermal deformation due to different thermal expansion coefficients, and are prone to plunger locking failures

If it is necessary to ensure sufficient deformation at high temperature, the gap between the rotor and the plunger at room temperature will be too large, and the volumetric efficiency will decrease.

At the same time, due to the difference in thermal deformation, the friction-reducing layer of the rotor is prone to cracks during heat treatment.

[0008] ③The copper alloy of the anti-friction layer is prone to fatigue wear, which causes the copper to transfer to the steel substrate, resulting in copper sticking, that is, the phenomenon of "cold welding", which affects the normal operation of the friction pair

[0009] ④Due to the low melting point of the copper alloy, the diffusion welding temperature is limited, and the strength of the copper alloy itself is low (for example, the σ of ZQSn10-2-3 b is 245MPa), therefore, the bonding strength of the copper-steel bimetallic friction pair is low, and the copper alloy layer on the end surface often falls off and the copper alloy layer in the plunger hole is pulled out.

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