Preparation method of wear-resistant coating for high-accuracy roller piece

A wear-resistant coating, high-precision technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of heavy workload, long cladding time, easy deformation of the workpiece, etc. Abrasiveness and impact resistance, high cladding efficiency, and low processing cost

Active Publication Date: 2011-08-17
BGRIMM ADVANCED MATERIALS SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem that the existing single supersonic flame spraying and atmospheric plasma spraying process makes the coating of the workpiece very easy to peel off during use; the heat effect is relatively large in the process of high-frequency induction cladding, vacuum sintering, and surfacing welding. , the workpiece is prone to deformation, and the cladding layer is very prone to cracks; before high-frequency induction cladding, it is necessary to prefabricate the coating on the surface of the workpiece. Usually, the method of manual coating is used, the workload is large, the cycle is long, and the coating is not dense. , the thickness is uneven, resulting in a long follow-up cladding time, so that the hard phase has enough time to gather to the bottom due to the specific gravity during cladding, resulting in the problem of uneven hardness of the coating after cladding, providing a high-precision Preparation method of wear-resistant coating for roll parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: Aiming at the ordinary steel rolls used for finishing rolling in steel mills, industrial cleaning agents are used to degrease and clean the surface; after cleaning and drying, 60-80 mesh alumina sand is selected for sand blowing roughening treatment, and the roughened workpiece The surface roughness is R4.0. Preheat the workpiece before spraying, the temperature is 150 ~ 200 ℃. The selected spraying powder is 70% NiCrBSi (Y or Ce) and 30% Ni-coated WC, the particle size of the powder is 45±10μm, and it is dried in an incubator at 150-200°C for 3 hours before spraying. The prefabricated coating is prepared on the surface of the substrate by supersonic flame spraying. The process parameters during the supersonic flame spraying process are 180-210L / min, the propane flow rate is 55-62L / min, the spraying distance is 190-210mm, and the air pressure is 0.3 ~0.4MPa, the powder delivery rate is 50~80g / min. After the prefabricated coating, use high-frequency induc...

Embodiment 2

[0011] Embodiment 2: Select 304 steel as the blank of the guide plate of the engine restraint mechanism, and process it into a guide plate; use an industrial cleaning agent to degrease and clean the surface of the guide plate; Purpose Alumina sand, the surface roughness of the workpiece after roughening is R4.2. Before spraying, preheat the workpiece at a temperature of 180-200°C. The selected spraying powder is 75% NiCrBSi(Y+Ce) and 25% Co coated WC, the particle size of the powder is 45±10μm, and it is dried in an incubator at 150-250°C for 3 hours before spraying. The prefabricated coating is prepared on the surface of the substrate by supersonic flame spraying, the thickness of the prefabricated coating is 0.5-1.0mm, the process parameters in the supersonic flame spraying process are 180-210L / min, and the propane flow rate is 55-62L / min , the spraying distance is 190-210mm, the air pressure is 0.3-0.4MPa, and the powder delivery rate is 50-80g / min. After the prefabricate...

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PUM

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Abstract

The invention relates to a preparation method of a wear-resistant coating for a high-accuracy roller piece. In the invention, a nickel-based (or cobalt-based) prefabricated layer is prepared by using a supersonic flame spraying process, and the prefabricated layer is treated by adopting an induction heating method, so that the bonding intensity between the coating and a substrate is enhanced. Thewear-resistant coating is prepared by adopting a composite surface treatment technology, so that a workpiece is prevented from being deformed in the machining process, the prepared coating is dense and crackless and has uniform hardness and high binding intensity, and the surface wear resistance and impact resistance of the workpiece are enhanced; and moreover, a preparation technology has the advantages of simple process, high cladding efficiency, low machining cost and the like. After machining, the binding intensity between the coating and the substrate is more than or equal to 70 MPa, andthe hardness of the coating can be up to HRB 55-70 by adjusting the adding amount of solid-phase wolfram carbide (WC) in spraying powder. The preparation method can be widely applied to the preparation of surface reinforced layers for industrial components with severe working conditions, such as high-frequency friction pairs, papermaking rollers, pumping rods, loops and the like.

Description

technical field [0001] The invention relates to a method for preparing a wear-resistant coating of a high-precision roller, and belongs to the technical field of wear-resistant coating preparation. Background technique [0002] In industrial production, a high-hardness reinforcement layer is often prepared on the surface of the workpiece to improve its wear resistance. At present, thermal spraying and remelting technologies are usually used at home and abroad to prepare wear-resistant layers to achieve wear-resistant strengthening on the surface of workpieces, mainly including supersonic flame spraying (HVOF), atmospheric plasma spraying (APS), plasma surfacing, high-frequency induction melting, etc. Deposit, vacuum fusion, spray welding, etc. The wear-resistant coating prepared by single thermal spraying technology such as HVOF spraying and APS spraying is usually mechanically bonded to the substrate, and its bonding strength is difficult to meet the needs of actual workin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/18C23C4/06C23C4/129
Inventor 沈婕高峰赵晓东张乐万伟伟国俊丰肖宁陆在平
Owner BGRIMM ADVANCED MATERIALS SCI & TECH
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