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 microcrac

Method used

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Experimental program
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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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