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Surface anti-impact abrasion-resisting lubricating composite coating for hydraulic valve rod and preparation method thereof

A technology of impact and wear resistance and composite coating, which is applied in the direction of coating, metal material coating process, superimposed layer plating, etc. Scratch performance and other issues, achieve good anti-wear lubrication effect and adaptability to variable working conditions, save manpower and material resources, and ensure stability

Active Publication Date: 2018-12-18
中国人民解放军空军勤务学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the insufficiency of conventional surface treatment technology that cannot meet the mechanical properties, corrosion resistance, impact resistance and scratch resistance of hydraulic valve stems, the present invention provides an impact-resistant and wear-resistant lubricating composite coating on the surface of hydraulic valve stems and its preparation method , the coating has the characteristics of anti-wear, self-lubricating and tough integration, which can effectively improve the reliability and service life of the hydraulic valve stem

Method used

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  • Surface anti-impact abrasion-resisting lubricating composite coating for hydraulic valve rod and preparation method thereof
  • Surface anti-impact abrasion-resisting lubricating composite coating for hydraulic valve rod and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] In this embodiment, the substrate is a Y15Pb Yiche iron hydraulic valve stem, and the hardness after aging treatment is ≥22HRC. The total thickness of the impact-resistant and wear-resistant lubricating composite coating on the surface of the hydraulic valve stem is controlled at 4.0-4.5 μm, and the composition is: Ti / TiC deposited by magnetron sputtering with a thickness of 0.6 μm from bottom to top on the surface of the substrate x / WTiC x / WC x Gradient transition layer, magnetron sputtering deposition of WC and amorphous carbon nano-multilayer composite functional layer with a thickness of 3.0-3.5 μm, and magnetron sputtering amorphous carbon top layer with a thickness of 0.5-1.0 μm.

[0031] The equipment used is a magnetron sputtering vacuum vapor deposition system in which high-purity graphite targets with a purity of 99.99%, high-purity titanium targets with a purity of 99.99%, graphite targets with a purity of 99.99%, and tungsten carbide targets are installed...

Embodiment 2

[0045] In this embodiment, the substrate is a 0Cr17Ni4Cu4N stainless steel hydraulic valve stem, and the hardness after aging treatment is ≥40HRC. The total thickness of the impact-resistant and wear-resistant lubricating composite coating on the surface of the hydraulic valve stem is controlled at 3.0-3.5 μm, and the composition is: Cr / CrC deposited by magnetron sputtering with a thickness of 0.5 μm from bottom to top on the surface of the substrate x A gradient transition layer, a Cr-doped amorphous carbon composite functional layer deposited by magnetron sputtering with a thickness of 1.8-2.5 μm, and a magnetron sputtered amorphous carbon top layer with a thickness of 0.5-1.0 μm.

[0046] The equipment used is magnetron sputtering with 99.99% pure graphite target, 99.99% pure chromium target, 99.99% pure graphite target, and 99.99% pure chromium target installed in sequence around the vacuum chamber. Sputtering vacuum vapor deposition system, the size of the sputtering targ...

Embodiment 3

[0060] In this embodiment, the substrate is a GCr15 bearing steel hydraulic valve stem, and the hardness after heat treatment is ≥56HRC. The total thickness of the impact-resistant and wear-resistant lubricating composite coating on the surface of the hydraulic valve stem is controlled at 3.5-4.5 μm, and the composition is: from bottom to top on the surface of the substrate, a Cr / CrN gradient transition layer deposited by magnetron sputtering with a thickness of 0.5-0.8 μm , a WC-doped amorphous carbon composite functional layer deposited by magnetron sputtering with a thickness of 1.5-2.0 μm, and an amorphous carbon top layer deposited by plasma chemical vapor technology with a thickness of 1.5-2.0 μm.

[0061] The equipment used is the magnetron-plasma of high-purity chromium target with a purity of 99.99%, tungsten carbide magnetron sputtering target, high-purity chromium target with a purity of 99.99%, and tungsten carbide magnetron sputtering target. Chemical vapor deposi...

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Abstract

The invention discloses a surface anti-impact abrasion-resisting lubricating composite coating for a hydraulic valve rod. The coating is composed of a gradient transition layer, a composite multifunctional layer and an amorphous carbon top layer which are sequentially arranged on the surface of a substrate in a stacked mode front bottom to top, and the total thickness is controlled to be 3.0-5.0 microns. The invention further provides a preparation method of the composite coating, the gradient transition layer is prepared through the magnetron sputtering technology or the arc ion plating technology, the composite multifunctional layer is prepared through the magnetron sputtering technology, and the amorphous carbon top layer is prepared through the magnetron sputtering technology or the plasma chemical vapor deposition technology. The surface hardness of the surface anti-impact abrasion-resisting lubricating composite coating for the hydraulic valve rod is larger than or equal to 12 GPa, the friction coefficient is lower than 0.15, high hardness, high toughness, abrasion resistance and friction reduction are integrated, the coating can be better applied to severe working conditions, high-reliability and long-life operation of the hydraulic valve rod is achieved, the coating-plating process is simple, and application value is large.

Description

technical field [0001] The invention belongs to the technical field of substrate surface anticorrosion, and relates to a surface coating of a hydraulic valve stem, in particular to an impact-resistant and wear-resistant lubricating composite coating on the surface of a hydraulic valve stem and a preparation method thereof. Background technique [0002] The valve stem is an important part of the hydraulic valve. It is used for transmission. The upper part is connected to the actuator or the handle, and the lower part directly drives the valve core to move or rotate to realize the switch of the hydraulic valve. Among them, the valve stem is a moving part, a stressed part and a key sealing part during the working process of the hydraulic valve. It usually bears a certain tension, pressure and torque, and has relative frictional movement with the packing and the valve stem nut, and is directly in contact with the medium. It will be aggravated by various wear and corrosion caused...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C14/35C23C14/16C23C14/06C23C14/32C23C16/26C23C16/515
CPCC23C14/0036C23C14/0605C23C14/0635C23C14/0641C23C14/16C23C14/165C23C14/325C23C14/352C23C16/26C23C16/515C23C28/30
Inventor 胡建强郭力曾现军张广安鲁志斌杨士钊
Owner 中国人民解放军空军勤务学院
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