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Preparation method of protective coating on surface of hydraulic transmission component

A technology of hydraulic transmission and protective coating, applied in the fields of corrosion and protection, metal material wear, can solve the problems of poor surface quality of coarse powder coating, environmental pollution, etc., to achieve small thickness difference, high surface finish, excellent stability. Effect

Active Publication Date: 2014-05-14
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims to solve the problems of environmental pollution caused by electroplating process and poor surface quality of coarse powder coating in the current manufacturing process of hydraulic transmission components, and provides a surface protection of hydraulic transmission components with high surface quality and high mechanical properties. Preparation method of WC-based coating

Method used

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  • Preparation method of protective coating on surface of hydraulic transmission component
  • Preparation method of protective coating on surface of hydraulic transmission component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Using WC-Co composite powder with an average particle size of 180nm as raw material, through agglomeration granulation and airflow classification treatment, a thermal spray feed material with a particle size distribution of 5-25 μm (such as figure 1 a), the fluidity of the thermal spraying feed is 20s / 50g; the diameter of the hydraulic support plunger to be sprayed (that is, the workpiece to be sprayed) is 140mm, and the surface of the workpiece is degreased, rusted, sandblasted and roughened. Heat treatment, the preheating flame is a reducing flame, and the surface temperature of the workpiece is controlled at 200°C; the WC-Co feed material prepared by spraying with a supersonic flame spray gun using air as the auxiliary gas is deposited on the surface of the preheated plunger with a thickness of 0.180mm coating, the barrel length of the supersonic flame spray gun is 170mm, the spraying flame temperature is 2000°C, the linear velocity of the plunger rotation is 0.3m / s, ...

Embodiment 2

[0020] Using WC-Co composite powder with an average particle size of 120nm as raw material, through agglomeration granulation and airflow classification, the thermal spraying feed material with a particle size distribution of 5-25μm (such as figure 1b), the fluidity of the thermal spraying feed is 23s / 50g; the diameter of the hydraulic support plunger to be sprayed (that is, the workpiece to be sprayed) is 160mm, and the surface of the workpiece is degreased, derusted, sandblasted and roughened. Heat treatment, the preheating flame is a reducing flame, and the surface temperature of the workpiece is controlled at 180°C; the WC-Co feed material prepared by spraying with a supersonic flame spray gun using air as the auxiliary gas is deposited on the surface of the preheated plunger with a thickness of 0.170mm coating, the barrel length of the supersonic flame spray gun is 165mm, the spraying flame temperature is 1900°C, the plunger rotation speed is 0.4m / s, and the horizontal mov...

Embodiment 3

[0022] Using WC-Co composite powder with an average particle size of 70nm as raw material, through agglomeration granulation and airflow classification, the thermal spray feed material with a particle size distribution of 5-25μm (such as figure 1 c), the fluidity of the thermal spraying feed is 25s / 50g; the diameter of the hydraulic support plunger to be sprayed (that is, the workpiece to be sprayed) is 180mm, and the surface of the workpiece is degreased, rusted, sandblasted and roughened. Heat treatment, the preheating flame is a reducing flame, and the surface temperature of the workpiece is controlled at 150°C; the WC-Co feed material prepared by spraying with a supersonic flame spray gun using air as the auxiliary gas is deposited on the surface of the preheated plunger with a thickness of 0.165mm coating, the barrel length of the supersonic flame spray gun is 160mm, the spraying flame temperature is 1800°C, the linear velocity of the plunger rotation is 0.5m / s, and the ho...

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Abstract

The invention relates to a preparation method of a protective coating on the surface of a hydraulic transmission component, belonging to the field of metal material abrasion, corrosion and protection technology. The preparation method comprises the steps of firstly, preparing WC-Co (tungsten carbide-cobalt) composite powder with average grain diameter of less than 200nm, agglomerating and pelleting to obtain thermal-spraying feeding powder with appropriate grain fineness distribution, coating hard alloy on the pretreated surface of the hydraulic transmission component by the hypersonic flame spraying technology using air as combustion-supporting gas, and polishing the surface of a workpiece to obtain the protective coating on the surface of the hydraulic transmission component, wherein the protective coating has high surface quality and high mechanical property. The method is simple and easy to realize, and can realize mass production.

Description

technical field [0001] The invention belongs to the technical field of wear, corrosion and protection of metal materials, and specifically provides a method for preparing a wear-resistant and corrosion-resistant hard alloy protective coating for hydraulic transmission components. Background technique [0002] A large number of construction machinery uses hydraulic transmission systems, and the surfaces of hydraulic transmission components (such as plungers, pistons, connecting rods, etc.) are subject to repeated friction, wear and corrosion, which can easily lead to early failure and scrapping, affecting engineering operations. In order to enhance surface protection, hard chrome plating is usually performed on the surface of transmission components to improve their service life. However, the emission of hexavalent chromium ions in the hard chromium electroplating process will cause serious environmental pollution and occupational health problems. In 2010, countries such as E...

Claims

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Application Information

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IPC IPC(8): C23C4/10C23C4/18C23C4/06C23C4/129
Inventor 宋晓艳王海滨郭广生刘雪梅贺定勇
Owner BEIJING UNIV OF TECH
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