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A wear-resistant and anti-friction composite coating for a lip-shaped oil seal rotating shaft and its preparation method

A composite coating, rotating shaft technology, applied in the direction of coating, metal material coating process, superimposed layer plating, etc., can solve the increasingly stringent requirements of lip-shaped oil seal rotating shaft wear resistance and friction reduction performance, There are no problems such as the inherent lubricity of electroplating hard chromium and the low ductility of super-hard coatings, and the effects of simple and reliable preparation method, less environmental pollution and obvious anti-friction effect are achieved.

Active Publication Date: 2020-05-26
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, super-hard coatings with excellent wear resistance usually have low ductility and do not have the inherent lubricity of hard chrome plating, which can easily lead to a reduction in the life of seals that cooperate with them
[0009] In summary, a single surface treatment process has been difficult to meet the increasingly stringent requirements of the lip-shaped oil seal rotating shaft for wear resistance and anti-friction performance. Multiple processes are used to prepare composite coatings to combine the performance of the corresponding coating layer. Feasible ways to strengthen the performance requirements of the surface of the rotary shaft of the shaped oil seal

Method used

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  • A wear-resistant and anti-friction composite coating for a lip-shaped oil seal rotating shaft and its preparation method
  • A wear-resistant and anti-friction composite coating for a lip-shaped oil seal rotating shaft and its preparation method
  • A wear-resistant and anti-friction composite coating for a lip-shaped oil seal rotating shaft and its preparation method

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preparation example Construction

[0032] The embodiment of the present invention provides a preparation method of the above-mentioned wear-resistant and anti-friction composite coating for the rotating shaft of the lip-shaped oil seal, including:

[0033] After degreasing and degreasing the base body of the rotating shaft, perform sandblasting on the spraying position. Sand blasting can remove the oxide layer on the surface of the substrate to increase surface activity and improve the bonding strength between the coating and the substrate. The grit materials used in sand blasting can be white corundum, brown corundum or zirconium corundum, and the grit size of the grit materials can be 46#, 54# or 60#. For reference, during the blasting process, the blasting pressure can be controlled at 0.2-0.5 MPa, and the blasting distance can be controlled at 100-300 mm. The axial direction of the nozzle of the sandblasting machine maintains an angle of 70° to 90° with the surface of the sample. After sandblasting, the su...

Embodiment 1

[0048] This embodiment provides a wear-resistant and anti-friction composite coating for a lip-shaped oil seal rotating shaft and a preparation method thereof, including:

[0049] 1. After degreasing and degreasing the TC4 titanium alloy sample of Φ57mm, perform sandblasting on the sprayed surface. The sand material is 54# white corundum. The sandblasting pressure is controlled at 0.24MPa, the spray distance is 180mm, and the angle is 75°. The sample after sandblasting The surface roughness is uniform, and the residual sand particles on the surface are blown away with compressed air.

[0050] 2. The WC10Co4Cr coating is sprayed with air-assisted combustion supersonic flame, the powder particle size is 5-25μm, the compressed air pressure is 0.59MPa, the propylene pressure is 0.50MPa, the hydrogen flow rate is 32L / min, the nitrogen flow rate is 33L / min, and the powder feeding rate is 70g / min. min, spray distance 175mm, turntable speed 240rpm, spray gun moving speed 20mm / s, coati...

Embodiment 2

[0057] This embodiment provides a wear-resistant and anti-friction composite coating for a lip-shaped oil seal rotating shaft and a preparation method thereof, including:

[0058] 1. After degreasing and degreasing the Φ80mm 7075 aluminum alloy sample, perform sand blasting on the sprayed surface. The sand grain material is 60# zirconium corundum. The sand blasting pressure is controlled at 0.26MPa, the spray distance is 200mm, and the angle is 80°. The sample after sand blasting The surface roughness is uniform, and the residual sand particles on the surface are blown away with compressed air.

[0059] 2. The WC10Co4Cr coating is sprayed with air-assisted combustion supersonic flame, the powder particle size is 10-30μm, the compressed air pressure is 0.61MPa, the propylene pressure is 0.52MPa, the hydrogen flow rate is 33L / min, the nitrogen flow rate is 34L / min, and the powder feeding rate is 110g / min. min, spray distance 185mm, turntable speed 200rpm, spray gun moving speed ...

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Abstract

The invention relates to a lip-type oil seal rotating shaft abrasion-resistant antifriction composite coating and a preparation method thereof, and belongs to the technical field of material surface treatment. The lip-type oil seal rotating shaft abrasion-resistant antifriction composite coating comprises a rotating shaft base body, a tungsten carbide coating, a tungsten carbide film and a nanocrystalline-mixed tungsten carbide gradient amorphous carbon film, wherein the tungsten carbide coating, the tungsten carbide film and the nanocrystalline-mixed tungsten carbide gradient amorphous carbonfilm are sequentially attached to the rotating shaft base body. The coating has quite good abrasion resistant and antifriction performance. The preparation method of the lip-type oil seal rotating shaft abrasion-resistant antifriction composite coating comprises the following steps that the tungsten carbide coating is sprayed on the surface of the pretreated rotating shaft base body by adopting an air combustion-supporting supersonic flame spraying method; and after the tungsten carbide coating is ground, polished and ion beam cleaned, the tungsten carbide film and the nanocrystalline-mixed tungsten carbide gradient amorphous carbon film are sequentially deposited by adopting ion source assisted magnetron sputtering. The preparation method is simple and reliable, mass production is easy to realize, and environmental pollution is little.

Description

technical field [0001] The invention relates to the technical field of material surface treatment, and in particular to a wear-resistant and anti-friction composite coating for a lip-shaped oil seal rotating shaft and a preparation method thereof. Background technique [0002] Rotary shaft lip seals (referred to as oil seals) have the advantages of simple structure, low cost, small footprint, easy installation and high sealing reliability. The shaft end seal is mainly composed of three parts: metal skeleton, hoop spring and rubber material. The working principle of the oil seal is that the force generated by the interference fit between the rubber lip and the shaft and the clamping force of the spring synthesize the radial force to prevent the outflow of the sealed medium, so as to achieve the effect of sealing and also play a role in preventing dust from the outside. effect. When the rotating shaft is working, three conditions of dry friction, boundary lubrication and flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/04C23C4/129C23C4/10C23C14/02C23C14/06C23C14/35C23C14/46
CPCC23C4/10C23C4/129C23C14/0036C23C14/022C23C14/028C23C14/0605C23C14/0635C23C14/352C23C14/46C23C28/042C23C28/046C23C28/048
Inventor 杨焜林松盛宋进兵曾威邓春明邓畅光代明江刘敏周克崧
Owner GUANGDONG INST OF NEW MATERIALS
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