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Gradient wear-resistant coating for carrier roller of conveyor belt and preparation method of gradient wear-resistant coating

A technology for wear-resistant coatings and conveyor belts, applied in coatings, metal material coating processes, manufacturing tools, etc., can solve problems such as insufficient wear and corrosion resistance, low residual stress, etc., and achieve excellent wear and corrosion resistance performance, reduce residual stress, increase density and binding force

Active Publication Date: 2013-10-23
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the technical problem of insufficient wear and corrosion resistance of the belt conveyor roller material surface in the coal mine underground environment and coal preparation, coal washing and other working conditions, and to develop a new metal / ceramic gradient coating preparation technology. Preparation of High Performance, High Bonding Strength, Low Residual Stress Gradient Composite Coating on the Surface of Carbon Steel Roller by Plasma Spray Welding Reaction Method

Method used

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  • Gradient wear-resistant coating for carrier roller of conveyor belt and preparation method of gradient wear-resistant coating
  • Gradient wear-resistant coating for carrier roller of conveyor belt and preparation method of gradient wear-resistant coating

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Experimental program
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Effect test

Embodiment 1

[0040] Step 1: Preparation of Metal / Ceramic Composite Coating Raw Materials

[0041] Spray welding reaction powder raw materials are Fe, Ti, WC, B4C, powder particle size: Fe, Ti powder particle size is 61-74μm, WC, B4C powder particle size is 44-53μm, according to the molar ratio Fe:Ti:B4C=2: 1:1, the amount of WC added accounts for 10% of the total mass of the spray welding reaction powder raw materials. Put the raw materials of the spray welding reaction into the mixer for ball milling for 4 hours, and take them out for later use;

[0042] The transition layer material is Ni60A, and the powder particle size is 44-74μm;

[0043] The second step: roller surface pretreatment process

[0044] The purpose of the surface pretreatment of the roller is mainly to form an active surface, improve the contact area and bonding strength between the spray welding layer and the substrate, and avoid the spray welding layer from falling off. It is divided into two steps of cleaning and sa...

Embodiment 2

[0054] In addition to the powder raw materials Fe, Ti, WC, and B4C, according to the molar ratio Fe:Ti:B4C=3:2:2, abbreviated as 3-2-2 system, the amount of WC added in the 3-2-2 system is the raw material for spray welding reaction 5% of the total mass, the thickness of the transition layer is controlled at 0.5mm, the powder feeding rate of the nickel-based self-fluxing alloy is 10g / min when the wear-resistant ceramic layer is prepared, and the powder feeding rate of the plasma spray welding reaction powder is controlled at 20g / min. Except for the plasma spray welding transferred arc current 150A during layer preparation, other processes and parameters are the same as in Embodiment 1.

[0055] The average microhardness of the obtained ceramic composite coating is 1135HV 0.2 , the average microhardness of transition layer nickel-based self-fluxing alloy is 877HV 0.2 .

Embodiment 3

[0057] In addition to the addition of WC in the powder raw materials, which is 7% of the total mass of the spray welding reaction raw materials, the powder feeding rate of the nickel-based self-fluxing alloy during the preparation of the wear-resistant ceramic layer is 12g / min, and the powder feeding rate of the plasma spray welding reaction powder is controlled at 25g / min , Except for the plasma spray welding transferred arc current 160A during the preparation of the wear-resistant ceramic layer, other processes and parameters are the same as in the second embodiment.

[0058] The average microhardness of the obtained ceramic composite coating is 1192HV 0.2 , the average microhardness of transition layer nickel-based self-fluxing alloy is 920HV 0.2 .

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Abstract

The invention discloses a gradient wear-resistant coating for a carrier roller of a conveyor belt and a preparation method of the gradient wear-resistant coating. The gradient wear-resistant coating is characterized in that a layer of NiCrBSi self-fluxing alloy powder is spray-welded on the surface of a preprocessed carbon steel carrier roller as a transition layer, and the NiCrBSi self-fluxing alloy powder and the mixed powder of Fe, Ti, WC and B4C are simultaneously spray-welded on the transition layer so as to form a ceramic coating on the transition layer, wherein a nickel-base self-fluxing alloy is taken as an adhesive base phase of the ceramic coating, and TiB2, TiC, Fe2B, Fe3C and WC high-hardness ceramic particles are taken as wear-resistant strengthening phases of the ceramic coating. According to the gradient wear-resistant coating, the nickel-base self-fluxing alloy is taken as the transition layer between the ceramic coating and the carbon steel carrier roller, the wettability is good, and the transition layer presents good metallurgical bonding with a matrix; and meanwhile, the thermal stresses of the coating and matrix materials are relieved, and the residual stress in the coating is reduced, so that the coating simultaneously has excellent wear resistance and corrosion resistance.

Description

technical field [0001] The present invention relates to transportation equipment--conveyor belt idler, especially the wear-resistant composite coating on the surface of the idler. Specifically, it is a kind of coating material with high hardness, wear resistance and wear resistance obtained by relying on the plasma spray welding process to stimulate the in-situ reaction of the coating material. Preparation technology of metal-based boride + carbide gradient composite coating with excellent corrosion performance. Background technique [0002] Belt conveyor is a simple, safe and reliable transportation equipment, which is widely used in coal mine transportation, coal preparation, coal washing and other fields. Its transmission parts are mainly composed of rollers and many idlers. The role of the idler is to support the conveyor belt and the weight of the material, and to ensure that the sag of the conveyor belt is within the design limit, and its support status directly affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/04C23C4/12B23K10/02C23C4/134
Inventor 崔洪芝王灿明宋强张姗姗王翠香
Owner SHANDONG UNIV OF SCI & TECH
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