Preparation method of tungsten carbide coating with micro-nano structure

A micro-nano structure, tungsten carbide technology, applied in coating, metal material coating process, pressure inorganic powder coating and other directions, can solve the problem of high cost of nano-tungsten carbide coating and the lack of effective solution for nano-tungsten carbide dispersion and retention. and other problems, to achieve the effect of uniform distribution of nano-phase, high hardness and less carbon loss

Active Publication Date: 2016-02-10
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

[0005] The thermal spraying nano-coatings in the prior art, especially the WC-based coatings, mainly use nano-tungsten carbide as raw material, adopt supersonic flame spraying or cold spraying processes, and control the spraying process conditions to...

Method used

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  • Preparation method of tungsten carbide coating with micro-nano structure

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Effect test

Embodiment 1

[0030] Embodiment 1, with tungsten powder, boron carbide, cobalt powder, tungsten carbide powder as raw material, wherein tungsten powder accounts for 40%, boron carbide accounts for 4.6%, cobalt powder accounts for 8%, tungsten carbide accounts for 47.4%; Tungsten powder D 50 ≤1 micron, boron carbide D 98 ≤2 microns, cobalt powder D 50 ≤1.5 microns, tungsten carbide D 50 = 0.8 ~ 1.5 microns;

[0031] The above raw materials are mixed evenly, granulated by adhesive agglomeration or spray drying, and then sprayed powder is obtained by degreasing and sintering process, and the maximum sintering temperature is 1250°C;

[0032] Select the particle size range of the spraying powder according to the conventional particle size, and prepare the coating by supersonic flame spraying process; among them, oxygen: 56 cubic meters per hour, kerosene 28 liters per minute, and spraying distance of 380 mm, to obtain a tungsten carbide coating containing micro-nano structure .

Embodiment 2

[0033] Embodiment 2, with tungsten powder, boron carbide, cobalt powder, tungsten carbide powder as raw material, wherein tungsten powder accounts for 80%, boron carbide accounts for 5.1%, cobalt powder accounts for 12%, tungsten carbide accounts for 8%; Tungsten powder D 50 ≤0.8 microns, boron carbide D 98 ≤1 micron, cobalt powder D 50 ≤1.0 micron, tungsten carbide D 50 = 1.0 ~ 1.5 microns;

[0034] The above raw materials are mixed evenly, granulated by adhesive agglomeration or spray drying, and then sprayed powder is obtained by degreasing and sintering process, and the maximum sintering temperature is 1300°C;

[0035] Select the particle size range of the spraying powder according to the conventional particle size, and prepare the coating by supersonic flame spraying process; among them, oxygen: 38 cubic meters per hour, kerosene 20 liters per minute, and spraying distance of 360 mm, to obtain a tungsten carbide coating containing micro-nano structure .

Embodiment 3

[0036] Embodiment 3, with tungsten powder, boron carbide, cobalt powder, tungsten carbide powder as raw material, wherein tungsten powder accounts for 60%, boron carbide accounts for 6%, cobalt powder accounts for 15%, tungsten carbide accounts for 19%; Tungsten powder D 50 ≤0.8 microns, boron carbide D 98 ≤2 microns, cobalt powder D 50 ≤1.0 micron, tungsten carbide D 50 = 1.5 ~ 2.5 microns;

[0037] The above raw materials are mixed evenly, granulated by adhesive agglomeration or spray drying, and then sprayed powder is obtained by degreasing and sintering process, and the maximum sintering temperature is 1350°C;

[0038] Select the particle size range of the spraying powder according to the conventional particle size, and prepare the coating by supersonic flame spraying process; among them, oxygen: 50 cubic meters per hour, kerosene 27 liters per minute, spraying distance 390 mm, to obtain a tungsten carbide coating containing micro-nano structure .

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Abstract

The invention discloses a preparation method of a tungsten carbide coating with a micro-nano structure. The preparation method comprises the following steps: firstly, a tungsten powder, a boron carbide powder, a cobalt powder and a tungsten carbide powder are taken as raw materials for preparing a spraying powder, wherein the tungsten powder accounts for 20 to 86.7 percent of the total weight, the boron carbide powder accounts for 1.2 to 10 percent of the total weight, the cobalt powder accounts for 8 to 25 percent of the total weight, and the tungsten carbide powder accounts for 30 to 75 percent of the total weight; the raw materials are mixed evenly, a way of glue agglomeration or spray drying is adopted for granulation, and then the spraying powder is obtained through degreasing-sintering fabrication processing; and the tungsten carbide coating with the micro-nano structure is prepared by using the obtained spraying powder, adopting supersonic speed flame spraying or a cold spraying process. The method is simple in process, nanophase distribution is even, carbon loss is less, nano tungsten carbide is contained in the coating, the coating with the micro-nano structure is formed, and the coating with the micro-nano structure is relatively high in hardness and good in toughness.

Description

technical field [0001] The invention relates to the technical field of thermal spraying, in particular to a preparation method of a micro-nano structured tungsten carbide coating. Background technique [0002] Thermal spraying technology can quickly prepare a layer of protective coating on the surface of the workpiece, endowing the surface of the workpiece with wear resistance, corrosion resistance, [0003] Different performances such as wear reduction and sealing. Tungsten carbide WC-based cermets have high hardness and good toughness, and are widely used in aerospace, metallurgy, petrochemical, machinery and other industries. In terms of industrial applications, supersonic flame spraying has high spraying speed and relatively low combustion temperature. , less carbide decarburization, and high bonding strength of the coating, it is currently the most suitable method for spraying tungsten carbide-based cermets. Common tungsten carbide-based cermets for thermal spraying i...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/129C23C24/04
CPCC23C4/06C23C24/04
Inventor 高峰白智辉沈婕鲍君峰冀国娟李杰
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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