High-compact WC-WB-Co spherical powder hard-face material and preparation method thereof

A spherical powder, wc-wb-co technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems that affect the wear resistance and corrosion resistance of the coating, the roughness of the powder surface, and the low bulk density of the powder. , to achieve the effect of improved corrosion resistance, better corrosion resistance, and improved sphericity

Active Publication Date: 2019-01-25
株洲江钨博大硬面材料有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microscopic appearance of the tungsten boride thermal spraying powder prepared by this method is hollow spherical, the surface roughness of the powder is relatively large, and the bulk density of the powder is relatively low; in addition, because the powder prepared by this method is hollow spherical, thermal After spraying, the porosity of the coating will be high, which will affect the wear resistance and corrosion resistance of the coating.

Method used

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  • High-compact WC-WB-Co spherical powder hard-face material and preparation method thereof
  • High-compact WC-WB-Co spherical powder hard-face material and preparation method thereof
  • High-compact WC-WB-Co spherical powder hard-face material and preparation method thereof

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preparation example Construction

[0043] A kind of preparation method of high density WC-WB-Co spherical powder hard surface material of the present invention comprises the following process steps:

[0044] (1) Ingredients: ingredients are made according to mass percentage, wherein the addition ratio of WC powder is 50%-75%, the addition ratio of WB powder is 15%-38%, and the addition ratio of metal Co powder is 8%-12%. PEG is a binder, and its addition amount is 1.0%-4.0% of the total mass;

[0045] (2) Wet milling: Put the prepared materials in the ball milling tank, use deionized water or edible alcohol as the ball milling medium, control the mass ratio of the ball to material within the range of 2:1-5:1, and the ball milling time is 20h- 72h;

[0046] (3) Spray drying: the wet-milled WC-WB-Co slurry is spray-dried using a pressure spray drying tower to prepare a standby mixed material;

[0047] (4) Compression: place the spray-dried powder in a powder press, and press it into a block-shaped embryo body u...

Embodiment 1

[0058] Example 1, figure 1 It is the SEM electron microscope image of 60WC-30WB-10Co spherical powder, taking the addition ratio of WC powder as 60%, the addition ratio of WB powder as 30%, and the addition ratio of metal Co powder as 10% as an example:

[0059] (1) Batching: batching is carried out according to mass percentage, wherein the addition ratio of WC powder is 60%, the addition ratio of WB powder is 30%, the addition ratio of metal Co powder is 10%, selects PEG as binder, and its addition amount 2.0% of the total mass;

[0060] (2) Wet milling: place the prepared materials in a ball milling tank, use deionized water as the ball milling medium, the mass ratio of balls to materials is 4:1, and the ball milling time is 48 hours;

[0061] (3) Spray drying: the wet-milled slurry is spray-dried by a pressure spray drying tower to prepare a standby mixed material;

[0062] (4) Compression: place the spray-dried powder in a powder press, and press it into a block-shaped e...

Embodiment 2

[0068] Example 2, figure 2 It is the SEM electron microscope image of 50WC-38WB-12Co spherical powder, taking the addition ratio of WC powder as 50%, the addition ratio of WB powder as 38%, and the addition ratio of metal Co powder as 12% as an example:

[0069] (1) Batching: batching is carried out according to mass percentage, wherein the addition ratio of WC powder is 50%, the addition ratio of WB powder is 38%, the addition ratio of metal Co powder is 12%, selects PEG as binder, its addition amount 2.2% of the total mass;

[0070] (2) Wet milling: place the prepared materials in a ball milling tank, use deionized water as the ball milling medium, the mass ratio of balls to materials is 3.5:1, and the ball milling time is 60h;

[0071] (3) Spray drying: the wet-milled slurry is spray-dried by a pressure spray drying tower to prepare a standby mixed material;

[0072] (4) Compression: place the spray-dried powder in a powder press, and press it into a block-shaped embryo ...

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Abstract

The invention relates to a high-compact WC-WB-Co spherical powder hard-face material and a preparation method thereof. The high-compact WC-WB-Co spherical powder hard-face material is prepared from, by mass, 50-75% of WC powder, 15-38% of WB powder, 8-12% of Co powder, and 1.0-4.0% of PEG binders. The high-compact WC-WB-Co spherical powder hard-face material has the advantages that WB is introduced into the design of a material system, and due to the fact that WB can react with metal-phase Co to obtain ternary-phase CoWB during powder sintering and CoWB has higher microhardness and better corrosion resistance performance than WC, wear resistance and corrosion resistance of the material can be improved greatly by adding of WB, the microhardness HV0.3 of the coating is increased to be and even higher than 1900, the corrosion resistance performance of the material is increased by at least twice; besides, by the high-temperature spherical production process, powder is heated and molten quickly, molten powder particles can solidify into spheres within a short time under action of surface tensions, so that degree of sphericity and the solid degree of single powder can be increased greatly, the apparent density of the finished powder product is equal to and even higher than 7.5 g / cm<3>, the powder flow velocity is lower than 10s / 50g, and the coating porosity is lower than 0.5%.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a high-density WC-WB-Co spherical powder hard surface material and a preparation method thereof. Background technique [0002] In recent years, with the rapid advancement of science and technology and the continuous improvement of modern industrial technology, modern machinery and equipment have increasingly stringent requirements on the surface properties of important parts. The surface wear and corrosion of the workpiece has always been an important factor restricting the life of modern machinery and equipment, especially under harsh conditions such as high temperature, high pressure, heavy load and corrosion, the entire set of equipment often fails due to the wear and corrosion of the workpiece surface. [0003] The hard surface material is coated on the surface of the workpiece by supersonic flame spraying technology, plasma surfacing technology, laser cladding technolo...

Claims

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Application Information

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IPC IPC(8): C22C29/02C22C1/05C22C1/10B22F1/00B22F9/04
CPCC22C1/051C22C29/005C22C29/02B22F9/04B22F1/065
Inventor 刘宝刚余晓坤陈彪马遥
Owner 株洲江钨博大硬面材料有限公司
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