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Wear and corrosion resistant coating material and preparation method thereof as well as coating and preparation method thereof

A coating material and wear-resistant coating technology, applied in the field of thermal spraying, can solve the problems of easy occurrence of micro-cracks, poor uniformity of corrosion resistance, poor coating density, etc. uniform effect

Active Publication Date: 2014-12-10
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Based on the problems existing in the above-mentioned prior art, the present invention provides a wear-resistant and corrosion-resistant coating material and its preparation method as well as the coating and its preparation method, which can effectively control the density of the coating, the microcracks caused by the spraying process and the processing process , so that the corrosion resistance of the coating meets the requirements of use, which can solve the problems of poor corrosion resistance uniformity of materials, poor coating density and easy microcracks in the existing thermal spraying technology

Method used

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Effect test

preparation example Construction

[0022] The preparation method of the above-mentioned wear-resistant and corrosion-resistant coating material comprises the following steps:

[0023] Take each raw material according to the above wear-resistant and corrosion-resistant coating material formula, add deionized water, defoamer and adhesive to the raw materials, and then carry out mixed ball milling to obtain a mixed slurry, and the mixed slurry is prepared after spray drying. Agglomerated particles are obtained, and the WC-CoCr powder obtained after sintering and crushing the agglomerated particles is the corrosion-resistant and wear-resistant coating material.

[0024] In the above method, the added binder accounts for 2-10% of the total weight of the raw materials. Deionized water (as a wet grinding medium) and defoamer (defoaming in wet grinding) can be added in an appropriate amount, as long as the requirements of wet grinding are met.

[0025] Further, the embodiment of the present invention also provides a w...

Embodiment 1

[0045] Take WC(D 97 = 0.9 μm, D 5 = 0.4 μm, D 50 =0.6μm), cobalt powder (D 50 =1μm), chrome powder (D 50 =3μm) as the raw material, wherein WC accounts for 86% of the total weight of the raw material, Co powder accounts for 10% of the total weight of the raw material, and Cr powder accounts for 4% of the total weight of the raw material; WC, Co, and Cr are mixed and ball milled, and an appropriate amount of deionized Water is the wet grinding medium, adding polyvinyl alcohol and polyethylene glycol accounting for 10% of the total weight of the mixed powder as a binder, adding an appropriate amount of defoamer, etc., and ball milling for 24 hours; input the mixed slurry into the centrifugal atomization spray drying equipment, The inlet temperature is 270°C, the outlet temperature is 180°C, the rotation speed of the atomization disc is 18000r / min, and the feeding rate is 300ml / min, and the agglomerated particles are obtained at the outlet; the agglomerated particles are place...

Embodiment 2

[0047] Take WC(D 97 = 0.85 μm, D 5 = 0.6 μm, D 50 =0.7μm), cobalt powder (D 50 =1μm), chromium powder (D 50 = 2.5 μm) as raw materials, wherein WC accounts for 86% of the total weight of raw materials, Co powder accounts for 10% of the total weight of raw materials, and Cr powder accounts for 4% of the total weight of raw materials; WC, Co, Cr are mixed and ball milled, and an appropriate amount of Ionized water is the wet grinding medium, adding polyvinyl alcohol and polyethylene glycol accounting for 10% of the total weight of the mixed powder as a binder, adding an appropriate amount of defoamer, etc., ball milling for 24 hours; input the mixed slurry into the centrifugal atomization spray drying equipment , the inlet temperature is 270°C, the outlet temperature is 180°C, the rotation speed of the atomizing disc is 18000r / min, the feeding rate is 300ml / min, and the agglomerated particles are obtained at the outlet; the agglomerated particles are placed in a vacuum degumm...

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Abstract

The invention discloses a wear and corrosion resistant coating material and a preparation method thereof as well as a coating and a preparation method thereof, belonging to the technical field of thermal spraying. The coating material which is powder particles is prepared from the following components in percentage by weight: 85-87% of tungsten carbide powder, 8-11% of cobalt powder and 2-7% of cobalt powder, wherein the grain size distribution of the tungsten carbide powder is as follows: D97 is less than or equal to 0.9 mu m, D5 is greater than or equal to 0.4 mu m and D50 is 0.6-0.8 mu m. The free path d of a metal binding phase among the tungsten carbide powder grains is less than or equal to 0.5 mu m. The preparation method of the coating materiel comprises the following steps: adding deionized water, a defoamer and an adhesive into raw materials for mixing and ball-milling to obtain mixed slurry; spraying and drying the mixed slurry to obtain agglomerated particles; and then, sintering and crushing the agglomerated particles to obtain a WC-10Co4Cr coating material which is the wear and corrosion resistant coating material. The coating prepared from the coating material can bear a water pressure of 150MPa without leakage and is free from rust when neutral salt spray test resistance is longer than 672 hours.

Description

technical field [0001] The invention relates to a wear-resistant and corrosion-resistant coating material and a preparation method thereof, and the coating and the preparation method, belonging to the technical field of thermal spraying. Background technique [0002] Tungsten carbide-based cermet materials have high hardness and good toughness, and the coating has excellent wear resistance. It has been widely used in aerospace, metallurgy, machinery and other industries. Adding a certain amount of Cr to WC-Co cermet forms WC-10Co4Cr spraying material, which improves the corrosion resistance while maintaining high hardness and high wear resistance, so that WC-10Co4Cr can be used for wear resistance in corrosive environments Protection, especially the supersonic flame spraying WC-10Co4Cr coating process can be used to replace the hard chromium plating process, so it is widely used. [0003] The protection of WC-10Co4Cr coating to the substrate is not only related to the corro...

Claims

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Application Information

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IPC IPC(8): C23C4/04C23C4/12B22F1/00C22C29/08C23C4/06C23C4/129
Inventor 于月光任先京高峰李杰白智辉万伟伟
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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