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Preparation method of wear-resistant screw shaft coating

A technology of screw shaft and coating, applied in the field of preparation of wear-resistant screw shaft coating, can solve the problems of poor corrosion resistance of tungsten carbide coating, unsatisfactory wear-resisting effect of materials, and limited service life of screw shaft, etc. Corrosion performance, good fluidity, increase the effect of anti-wear

Active Publication Date: 2018-09-18
佛山市南海区科琎精密机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The environmental pollution of chrome plating is serious, and the wear resistance of arc sprayed materials is not ideal; at the same time, due to the presence of corrosive calcium sulfite in this working environment, the corrosion resistance of tungsten carbide coating is poor and the service life is short
The service life of the existing screw shaft is only 6000h, and its Rockwell response is 72HRC

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing a wear-resistant spiral shaft coating, comprising the following steps:

[0024] 1) Mix 15 parts of cobalt powder, 4 parts of chromium powder and 81 parts of tungsten carbide powder, add epoxy resin AB glue, polyethylene glycol and water, and stir to obtain a slurry with a solid content of 60%;

[0025] Among them, the average particle size d of cobalt powder 50 10 microns, the average particle size of chromium powder d 50 10 microns, the average particle size of tungsten carbide powder d 50 It is 10 microns; the total amount of adding epoxy resin AB glue and polyethylene glycol is 5% of the powder after mixing.

[0026] 2), obtain the cobalt-chromium-tungsten carbide composite powder after the obtained slurry is spray-dried;

[0027] 3), the obtained cobalt-chromium-tungsten carbide composite powder and nickel powder are added into a ball mill according to the ratio for dry grinding, and after ball milling for 5 minutes, they are added to a vac...

Embodiment 2

[0035] A method for preparing a wear-resistant spiral shaft coating, comprising the following steps:

[0036] 1), mix 5 parts of cobalt powder, 8 parts of chromium powder and 87 parts of tungsten carbide powder, add polyacrylate resin and water and stir to obtain a slurry with a solid content of 70%;

[0037] Among them, the average particle size d of cobalt powder 50 45 microns, the average particle size of chromium powder d 50 50 microns, the average particle size of tungsten carbide powder d 50 It is 50 microns, and its microscopic appearance is spherical; The mass fraction of polypropylene resin added is 5% of the mixed powder;

[0038] 2), the obtained slurry is spray-dried and sieved to obtain cobalt-chromium-tungsten carbide composite powder;

[0039] 3), the obtained cobalt-chromium-tungsten carbide composite powder and nickel powder are added into a ball mill according to the ratio for dry grinding, and after 15 minutes of ball milling, they are added to a vacuum f...

Embodiment 3

[0047] A method for preparing a wear-resistant spiral shaft coating, comprising the following steps:

[0048] 1) Mix 10 parts of cobalt powder, 4 parts of chromium powder and 86 parts of tungsten carbide powder, add epoxy resin AB glue and water and stir to obtain a slurry with a solid content of 70%;

[0049] Among them, the average particle size d of cobalt powder 50 25 microns, the average particle size of chromium powder d 50 30 microns, the average particle size of tungsten carbide powder d 50 It is 50 microns, and its microscopic appearance is irregular; the addition amount of epoxy resin AB glue is 10% of the powder after mixing.

[0050] 2), the obtained slurry is spray-dried and sieved to obtain cobalt-chromium-tungsten carbide composite powder;

[0051] 3), the obtained cobalt-chromium-tungsten carbide composite powder and nickel powder are added into a ball mill according to the ratio for dry grinding, and after ball milling for 2 minutes, they are added to a vac...

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Abstract

The invention provides a preparation method of a wear-resistant screw shaft coating. The preparation method comprises the following steps of: firstly mixing cobalt powder, chromium powder, tungsten carbide powder and an adhesive with water to prepare slurry; carrying out spray drying; carrying out ball milling and vacuum braking on the obtained powder and nickel powder and afterwards carrying outcrushing and screening to obtain coating powder; and finally uniformly spraying the coating powder on the surface of a screw shaft by adopting a hypersonic flame spraying process. According to the preparation method provided by the invention, an anti-corrosive nickel component is added to the prescription of the coating, so the corrosion resistance of the coating is greatly improved; the preparation process of the coating powder is simple; the prepared coating powder is uniform in in ingredients and good in fluidity and can meet the requirements of thermal spraying. Meanwhile, a hypersonic flame spraying technology is adopted, a few-gap, low-oxidation, high-adhesive-force and high-quality coating is formed, so the wear resistance and the corrosion resistance of screw shaft blades are greatly improved; and the screw shaft can work normally under a multiple-complexity industrial mine with corrosive mediums and high resistance.

Description

technical field [0001] The invention belongs to the technical field of material surface strengthening, and in particular relates to a preparation method of a wear-resistant spiral shaft coating. Background technique [0002] Pressing screw shaft is one of the essential accessories for pulp washing in the field of papermaking. The screw pitch decreases with the increase of the inner diameter of the screw shaft from the inlet to the outlet, and the volume of the screw groove gradually decreases, so that the pulp is press. During this working process, the working surface of the screw shaft will be worn. If the surface is not treated, the working life will be shortened and the output will be affected. The prior art usually adopts arc spraying method to plate chromium or tungsten carbide on the surface of the screw shaft. The environmental pollution of chrome plating is serious, and the wear resistance effect of arc sprayed materials is not ideal; at the same time, due to the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/129
CPCC23C4/06C23C4/129
Inventor 董云山
Owner 佛山市南海区科琎精密机械有限公司
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