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Method for preparing WC-Co metal-ceramic coating of superfine structure

A cermet coating, fine structure technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problem of low powder deposition efficiency, structure compactness of coarse powder coating, and comprehensive bonding strength between layers. The strength and toughness and surface quality are difficult to meet the actual requirements, and the cost of the coating is high, so as to reduce the tendency of decomposition and oxidative decarburization, have good fatigue resistance, and improve the surface quality.

Inactive Publication Date: 2008-11-19
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the vast majority of applications in domestic and foreign industrial fields are WC-Co coatings with micron-sized coarse powders. Density, interlayer bonding strength, comprehensive strength and toughness, and surface quality are often difficult to meet actual requirements
Moreover, in the preparation process of the coarse powder coating, the powder deposition efficiency is low, and the cost of coating preparation is relatively high

Method used

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  • Method for preparing WC-Co metal-ceramic coating of superfine structure
  • Method for preparing WC-Co metal-ceramic coating of superfine structure
  • Method for preparing WC-Co metal-ceramic coating of superfine structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) will WO 2.9 、Co 3 o 4 Mix with carbon black powder at a mass ratio of 5.79: 1: 1.40 and ball mill into particles with a particle size below 300 nanometers, send them into a vacuum furnace with a vacuum gas pressure of less than 0.004Pa, and use the following process parameters to carry out the in-situ reaction: The temperature was raised to 820°C at a heating rate of 10°C / min, and the holding time was 4 hours to obtain a WC-Co composite powder with an average particle size of 150 nm (the micromorphology is shown in Figure 1(a));

[0023] (2) The prepared WC-Co composite powder is granulated by a centrifugal spray dryer, and the process parameters adopted are: the rotational speed is 300 Hz. After the composite powder slurry is sieved, it is kept in a vacuum oven at 60°C for 1 hour to obtain Spherical granular WC-Co composite powder with uniform size (microscopic appearance is shown in Figure 2(a));

[0024] (3) Use supersonic flame spraying equipment to spray the...

Embodiment 2

[0027] (1) will WO 2.9 、Co 3 o 4 Mix with carbon black powder at a mass ratio of 5.79: 1: 1.40 and ball mill into particles with a particle size below 300 nanometers, send them into a vacuum furnace with a vacuum gas pressure of less than 0.004Pa, and use the following process parameters to carry out the in-situ reaction: The heating rate of 20°C / min was raised to 900°C, and the holding time was 3 hours, and the WC-Co composite powder with an average particle size of 200 nm was obtained (the micromorphology is shown in Figure 1(b));

[0028] (2) The prepared WC-Co composite powder is granulated by a centrifugal spray dryer, and the process parameters adopted are: the rotational speed is 300 Hz. After the composite powder slurry is sieved, it is kept in a vacuum oven at 80 °C for 1 hour to obtain Spherical particles with uniform size (microscopic appearance is shown in Figure 2(b));

[0029] (3) Use supersonic flame spraying equipment to spray the granulated composite powder...

Embodiment 3

[0032] (1) will WO 2.9 、Co 3 o 4Mix with carbon black powder at a mass ratio of 5.79: 1: 1.40 and ball mill into particles with a particle size below 300 nanometers, send them into a vacuum furnace with a vacuum gas pressure of less than 0.004Pa, and use the following process parameters to carry out the in-situ reaction: The heating rate of 30°C / min was raised to 1050°C, and the holding time was 1 hour, and the WC-Co composite powder with an average particle size of 300 nm was prepared (the micromorphology is shown in Figure 1(c));

[0033] (2) The prepared WC-Co composite powder is granulated by a centrifugal spray dryer, and the process parameters adopted are: the rotational speed is 300 Hz. After the composite powder slurry is sieved, it is kept in a vacuum oven at 100 ° C for 1 hour to obtain Spherical particles with uniform size (microscopic appearance is shown in Figure 2(c));

[0034] (3) Use supersonic flame spraying equipment to spray the granulated composite powde...

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Abstract

The invention relates to a method for preparing a WC-Co cermet coating provided with an ultrafine structure, belonging to the novel material and surface engineering technical field. The method aims to solve the problem of Cr<6+> pollution and hazard caused by the prior durionising technique and the problem of poor comprehensive performance of the prior coarse powder coating. The method is as follows: SO2.9, Co3O4 and carbon black are taken as raw materials to synthesize WC-Co composite powder with a grain diameter between 150 and 300 nanometers in a vacuum furnace through reaction in-situ after ball milling and mixing of the raw materials; a centrifugal spray dryer is utilized for granulation, sieving and drying of the composite powder, and then spherical particles with uniform diameter are obtained; and supersonic velocity flame plating equipment is utilized subsequently to spray the composite powder of the spherical particles on the surfaces of workpieces to prepare the WC-Co cermet coating provided with the ultrafine structure. The coating has high hardness and abrasion resistance and good performance of matching of the strength and the toughness.

Description

technical field [0001] The invention belongs to the technical field of new materials and surface engineering, and in particular relates to a preparation method of an ultrafine structure WC-Co cermet coating. Background technique [0002] Along with the optimization and upgrading of the industrial structure, many mechanical parts have early failure or scrapping due to local wear and corrosion on the surface, resulting in a great consumption of materials and energy. In order to achieve wear-resistant and corrosion-resistant surface pre-protection and repair, a large number of mechanical parts are currently treated with hard chrome plating on the surface. However, the Cr produced in hard chrome plating production 6+ Emissions will lead to serious environmental pollution, resource consumption, and safety and occupational health issues. Countries such as Europe and the United States have clearly stipulated that the electroplating production of hexavalent chromium should be compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/04
Inventor 宋晓艳刘文彬李辉程汉池王海滨张久兴周美玲史耀武左铁镛
Owner BEIJING UNIV OF TECH