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Iron alloy wear-resistant coating for guide sliding boot of coal mining machine and preparation method

A guide shoe and ferroalloy technology, applied in metal material coating process, coating, etc., can solve the problems of high maintenance cost, poor wear resistance, etc., achieve low maintenance cost, low wear rate, and ensure accuracy

Pending Publication Date: 2021-10-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims at the technical problems of poor anti-wear performance and high maintenance cost of the shearer guide shoe under the condition of heavy-duty dry friction, and provides a ferroalloy anti-wear coating for the shearer guide shoe and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] A method for preparing an iron alloy anti-wear coating for a shearer guide shoe, comprising the steps of:

[0015] In the first step, the surface of the guide shoe is roughened by shot peening, and the surface is cleaned with acetone;

[0016] The second step is to weigh iron powder, chromium powder, tungsten powder, boron powder, carbon powder and cobalt powder in proportion, mix them evenly, put them into the powder feeding barrel, and adopt the laser synchronous cladding method. The laser power is 900-1400w. The coverage rate is 4-6mm / s, the spot diameter is 2mm, the overlap rate is 25-45%, and the coating thickness is 1-4mm.

Embodiment 1

[0018] A ferroalloy anti-wear coating for shearer guide shoes and a preparation method thereof, the composition and mass percentage of the anti-wear ferro-alloy coating are as follows: Fe 67.3%; Cr 19.0%; W 8.0%; B 3.5%; C 1.2%; Co 1.0%. Mix the above raw materials uniformly in a planetary ball mill to obtain uniformly mixed powder, put the obtained mixed powder into the powder feeding barrel, adopt the laser synchronous cladding method, the laser power is 1000w, and the cladding rate is 4mm / s , the diameter of the light spot is 2mm, and the overlap rate is 25%, and the iron alloy anti-wear coating with a thickness of 1.0mm is obtained. The obtained iron alloy anti-wear coating material has a Vickers hardness of 565HV, and the wear rates measured under different temperature conditions are shown in Table 1.

[0019] Table 1

[0020] test temperature 22°C (room temperature) 100 200 300 wear rate (10 -6 mm 3 / N.m)

Embodiment 2

[0022] A ferroalloy anti-wear coating for shearer guide shoes and a preparation method thereof, the composition and mass percentage of the anti-wear ferro-alloy coating are as follows: Fe 61.5%; Cr 22.0%; W 9.0%; B 4.5%; C 1.0%; Co 2.0%. Mix the above raw materials uniformly in a planetary ball mill to obtain a uniformly mixed powder, put the obtained mixed powder into the powder feeding barrel, adopt the laser synchronous cladding method, the laser power is 1200w, and the cladding rate is 5mm / s , the diameter of the light spot is 2mm, and the overlap rate is 40%, and the iron alloy anti-wear coating with a thickness of 2.5mm is obtained. The obtained iron alloy anti-wear coating material has a Vickers hardness of 601HV, and the wear rates measured under different temperature conditions are shown in Table 2.

[0023] Table 2

[0024] test temperature 22°C (room temperature) 100 200 300 wear rate (10 -6 mm 3 / N.m)

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Abstract

The invention discloses an iron alloy wear-resistant coating for a guide sliding boot of a coal mining machine and a preparation method, belongs to the technical field of preparing an iron-based wear-resistant coating by adopting a laser cladding technology, and can solve the technical problems that an existing guide sliding boot of the coal mining machine is poor in wear resistance, high in maintenance cost and the like under a heavy-load dry friction condition. The iron alloy wear-resistant coating comprises the following components in percentage by mass: 60%-70% of iron powder, 18%-25% of chromium powder, 6%-10% of tungsten powder, 3.5%-4.5% of boron powder, 0.8%-1.2% of carbon powder and 1%-2% of cobalt powder. According to the invention, a layer of iron-based wear-resistant coating metallurgically bonded with a substrate is clad on the guide surface of the guide sliding boot by using a synchronous laser cladding method. The coating has excellent wear resistance, plastic deformation resistance and high hardness under the heavy-load dry friction condition, and the service life of the guide sliding boot is greatly prolonged. The iron-based wear-resistant coating provided by the invention is simple in preparation method and low in cost, and the maintenance cost of the coal mining machine can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of preparing iron-based wear-resistant coatings by adopting laser cladding technology, and in particular relates to an iron-alloy wear-resistant coating used for a shearer guide shoe and a preparation method thereof. Background technique [0002] Ensuring safety and efficiency is the goal that the coal industry has been pursuing. The guide shoe is an important part of the shearer, which plays a guiding and supporting role. During the working process, not only the self-weight of the coal shearer, but also part of the coal mining load must be borne. The working face adopts an open structure, lacks lubricating grease, and the working conditions are normal temperature and high temperature sliding dry friction, so the guide shoe is prone to serious damage. wear and tear. It takes 5-6 hours to replace the guide shoe, which seriously affects the working efficiency of the coal mining machine and increases the main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C38/22C22C38/30C22C38/32
CPCC23C24/106C22C38/22C22C38/32C22C38/30
Inventor 崔功军程书帅李方舟寇子明吴娟
Owner TAIYUAN UNIV OF TECH
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