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Running-in coating for improving tribological performance of hard plating layer on outer circular surface of piston ring in running-in period and preparation method of running-in coating

A technology for piston rings and outer circular surfaces, applied in coatings, metal material coating processes, sputtering coatings, etc., can solve problems such as poor running-in performance of hard coatings, and achieve the effect of solving insufficient strength

Pending Publication Date: 2022-04-12
ASIMCO SHUANGHUAN PISTON RING YIZHENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect of poor running-in performance of the hard coating in the prior art, and provide a running-in coating for improving the tribological performance of the hard coating on the outer surface of the piston ring during the running-in period and a preparation method thereof

Method used

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  • Running-in coating for improving tribological performance of hard plating layer on outer circular surface of piston ring in running-in period and preparation method of running-in coating
  • Running-in coating for improving tribological performance of hard plating layer on outer circular surface of piston ring in running-in period and preparation method of running-in coating
  • Running-in coating for improving tribological performance of hard plating layer on outer circular surface of piston ring in running-in period and preparation method of running-in coating

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Effect test

Embodiment 1

[0055] In this embodiment, the substrate is a CrN-based ceramic plated piston ring with a hardness of HV1200-1500. The bonding layer is a Ti metal layer, and the transition layer is a Ti metal content that gradually decreases from the substrate to MoS 2 The content gradually increases, and the surface running-in layer is Ti / MoS 2 , the preparation method of the running-in layer on the surface of the piston ring comprises the following steps:

[0056] Step 1, using a diamond grinder to pre-polish the outer surface of the piston ring coated with the CrN-based ceramic coating until the surface roughness of the CrN coating on the outer surface of the piston ring is less than 0.8 μm.

[0057] Step 2, the polished piston ring is ultrasonically cleaned twice with acetone and absolute ethanol in sequence, each time for 15 minutes, and quickly dried with high-purity nitrogen.

[0058] Step 3, using unbalanced magnetron sputtering equipment to etch and clean the hard coating on the ou...

Embodiment 2

[0063] In this embodiment, the substrate is a piston ring coated with a CrN-based ceramic coating, with a hardness of HV1200-1500. The bonding layer is a Cr metal layer, and the transition layer is a Cr metal content that gradually decreases from the base to MoS 2 Cr / MoS with increasing content 2 layer, the surface running-in layer is Cr / MoS 2 , the preparation method of the running-in layer on the surface of the piston ring comprises the following steps:

[0064] Step 1, using a diamond grinder to pre-polish the outer surface of the piston ring coated with the CrN-based ceramic coating until the surface roughness of the CrN coating on the outer surface of the piston ring is less than 0.8 μm.

[0065] Step 2, the polished piston ring is ultrasonically cleaned twice with acetone and absolute ethanol in sequence, each time for 15 minutes, and quickly dried with high-purity nitrogen.

[0066] Step 3, using unbalanced magnetron sputtering equipment to etch and clean the hard co...

Embodiment 3

[0071] In this embodiment, the substrate is a DLC-coated piston ring with a hardness of HV1600-2200. The bonding layer is a Ti metal layer, and the transition layer is a Ti metal content that gradually decreases from the substrate to MoS 2 The content gradually increases, and the surface running-in layer is Ti / MoS 2 , the preparation method of the running-in layer on the surface of the piston ring comprises the following steps:

[0072] Step 1, using a diamond grinder to pre-polish the outer surface of the DLC-coated piston ring until the surface roughness of the DLC coating on the outer surface of the piston ring is less than 0.8 μm.

[0073] Step 2, the polished piston ring is ultrasonically cleaned twice with acetone and absolute ethanol in sequence, each time for 15 minutes, and quickly dried with high-purity nitrogen.

[0074] Step 3, using unbalanced magnetron sputtering equipment to etch and clean the hard coating on the outer surface of the piston ring by argon ion e...

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Abstract

The invention provides a running-in coating for improving the tribological performance of a hard plating layer on the outer circle face of a piston ring in the running-in period and a preparation method of the running-in coating, and belongs to the technical field of engine accessory surface treatment. The running-in coating sequentially comprises a hard plating layer, a metal bonding layer, a gradient transition layer and a running-in layer. The method for plating the running-in coating on the outer circular surface of the piston ring comprises the following steps: plating the hard plating layer on the outer circular surface of the piston ring; depositing a metal bonding layer on the surface of the hard plating layer; depositing a gradient transition layer on the surface of the metal bonding layer; and depositing a running-in layer on the surface of the gradient transition layer. The initial surface hardness of the wear-resistant layer of the piston ring is reduced through the running-in coating, the running-in time is shortened, the surface roughness of the piston ring after running-in is reduced, and the situation that the piston ring and the cylinder sleeve are seriously abraded and even strained and invalid due to oil film breakage in the running-in process caused by overhigh local contact stress between the piston ring and the cylinder sleeve is prevented.

Description

technical field [0001] The invention relates to the technical field of surface treatment of engine accessories, in particular to a running-in coating for improving the tribological performance of a hard coating on the outer circular surface of a piston ring during the running-in period and a preparation method thereof. Background technique [0002] Improving the tribological characteristics of the engine piston ring-cylinder liner friction pair can not only improve the mechanical efficiency of the fuel engine, but also improve engine performance, reduce pollutant emissions, and prolong engine life. The abnormal wear of the piston ring-cylinder liner friction pair often occurs in the initial operation stage of the engine. At this time, due to the poor matching of the roughness between the contact surface of the piston ring and the cylinder liner, the amount of lubricating oil between the friction pairs is very small, and it is difficult to effectively establish a lubricating o...

Claims

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Application Information

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IPC IPC(8): C23C14/35C23C14/02C23C14/06
Inventor 李开顺石关飞殷从伟
Owner ASIMCO SHUANGHUAN PISTON RING YIZHENG