Self-lubricating composite coating, coating preparation method and article with the coating

A composite coating, self-lubricating technology, applied in the direction of coating, metal material coating process, mechanical equipment, etc., can solve the problems of difficult adjustment and optimization of process, shortening service life of bearing bush, poor coating compactness, etc. Tribological properties, stress reduction, good effect of fatigue resistance

Active Publication Date: 2019-12-10
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the AlSn20Cu coating has high load-bearing capacity and excellent tribological properties under oil lubrication conditions, its friction coefficient is still high in the oil-poor or dry friction state, and it is prone to high wear, and the repeated start-stop state is easy to reduce Bearing service life
At present, domestic research on AlSn20Cu coatings mainly focuses on its preparation method and industrialization, and there are few reports on the improvement of its self-lubricating properties.
At the same time, the element components in the AlSnCu alloy target used in the experiment have been fixed, resulting in a small adjustable range of the content of different elements in the prepared thin film material, difficult process adjustment and optimization, poor density of the prepared coating, and slow deposition rate.

Method used

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  • Self-lubricating composite coating, coating preparation method and article with the coating
  • Self-lubricating composite coating, coating preparation method and article with the coating
  • Self-lubricating composite coating, coating preparation method and article with the coating

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preparation example Construction

[0038] The preparation method of above-mentioned self-lubricating composite coating comprises the following steps:

[0039]Target material selection steps: AlSn20Cu alloy target is selected as the intermediate frequency AC sputtering target, wherein the weight percentages of Al, Sn and Cu are 79%, 20% and 1% respectively, and MoS with a purity of not less than 99.99% is selected respectively 2 Target and Ni target are used as pulsed DC sputtering targets;

[0040] Sample pretreatment step: put the sample to be coated into the cavity of the coating equipment, and vacuum the cavity to 0.5×10 -3 ~2×10 -3 Pa, introduce Ar gas into the coating cavity to keep the vacuum in the cavity at 1-1.6Pa, and at the same time apply a bias voltage of -600V--800V with a duty ratio of 40%-60% to remove the Dust and adsorbents, the cleaning time is 30 minutes;

[0041] Step of depositing Ni gate layer: adjust the Ar gas to keep the pressure in the cavity at 3×10 -3 Pa~5×10 -3 Pa, the substra...

Embodiment 1

[0046] A preparation method for a self-lubricating composite coating on a bearing bush is provided, comprising the following steps:

[0047] Target material selection steps: AlSn20Cu alloy target is selected as the intermediate frequency AC sputtering target, wherein the weight percentages of Al, Sn and Cu are 79%, 20% and 1% respectively, and MoS with a purity of not less than 99.99% is selected respectively 2 Target and Ni target are used as pulsed DC sputtering targets;

[0048] Sample pretreatment steps: select steel / CuPb22Sn4 bearing blanks, and ultrasonically clean the bearing blanks in ultrapure water, ethanol, and acetone for 15 minutes, and then wash them with N 2 Dry it and put it into the coating chamber; place the polished and cleaned bearing bush sample in the cavity of the coating equipment and then vacuumize it to 0.5×10 -3 ~2×10 -3 Pa, argon gas is introduced into the coating chamber to keep the vacuum in the chamber at a vacuum pressure of 1 to 1.6 Pa, and a...

Embodiment 2

[0055] A preparation method for a self-lubricating composite coating on a bearing bush is provided, comprising the following steps:

[0056] Target material selection steps: AlSn20Cu alloy target is selected as the intermediate frequency AC sputtering target, wherein the weight percentages of Al, Sn and Cu are 79%, 20% and 1% respectively, and MoS with a purity of not less than 99.99% is selected respectively 2 Target and Ni target are used as pulsed DC sputtering targets;

[0057] Sample pretreatment steps: select steel / CuPb22Sn4 bearing blanks, and ultrasonically clean the bearing blanks in ultrapure water, ethanol, and acetone for 15 minutes, and then wash them with N 2 Dry it and put it into the coating chamber; place the polished and cleaned bearing bush sample in the cavity of the coating equipment and then vacuumize it to 0.5×10 -3 ~2×10 -3 Pa, argon gas is introduced into the coating chamber to keep the vacuum in the chamber at a vacuum pressure of 1 to 1.6 Pa, and a...

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Abstract

The invention discloses a self-lubricating composite coating, a coating preparation method and products with the coating. The self-lubricating composite coating of the present invention comprises several AlSn20Cu layers and several MoS 2 layer, AlSn20Cu layer with MoS 2 Layers are set alternately. The self-lubricating composite coating provided by the present invention introduces MoS into the original AlSn20Cu coating 2 The lubricating layer makes the coating composition and structure diversified, which can effectively reduce the stress of the coating and improve the bonding force of the film base. In addition, MoS 2 The introduction of phases can greatly improve the tribological properties of AlSn20Cu coatings in oil-poor and dry friction environments without changing the original lubricating properties of AlSn20Cu coatings.

Description

technical field [0001] The invention relates to the technical field of surface coatings, in particular to a self-lubricating composite coating, a coating preparation method and products with the coating. Background technique [0002] As one of the important transmission and load-bearing parts of the diesel engine system, the bearing pad is gradually developing towards high speed, high load, low energy consumption and high power in service conditions, so the performance requirements for the bearing pad are becoming more and more stringent. The AlSn20Cu bearing prepared by the magnetron sputtering method, as a new type of environmentally friendly (lead-free) bearing, has incomparable advantages in load capacity and anti-seizing performance, and is widely used as an internationally advanced bearing coating in large Power density and high reliability diesel engine bearings. [0003] However, the engine is often in the state of start-stop or instantaneous acceleration during act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/06C23C14/18C23C14/16C23C14/35F16C33/12
CPCC23C14/0623C23C14/165C23C14/185C23C14/352F16C33/12
Inventor 宋惠刘智勇唐纬虹陈杰张华方晓祖凌国平
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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