Metal-coated spherical cast tungsten carbide powder and preparation method thereof

A technology of casting tungsten carbide and metal cladding, which is applied in the direction of metal material coating process, liquid chemical plating, coating, etc., can solve the problems of high risk factor in operation, insufficient bonding force of coating, and reduced activation effect, etc., to achieve reduction Production cost, ensuring adsorption and chelation effects, and improving the coating binding force

Active Publication Date: 2020-05-05
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] This method uses hydrofluoric acid as the main etching solution to etch the ceramic powder, thereby forming catalytic active sites that are conducive to the reduction and deposition of metal ions on the surface of the ceramic powder for subsequent electroless plating, which has a large risk factor for operation and insufficient bonding force of the coating. issues need to be further resolved
In addition, this method is easy to form catalytic sites at the corners of the irregular powder surface, while on the smooth spherical powder surface, the activation effect of this method is reduced

Method used

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  • Metal-coated spherical cast tungsten carbide powder and preparation method thereof
  • Metal-coated spherical cast tungsten carbide powder and preparation method thereof
  • Metal-coated spherical cast tungsten carbide powder and preparation method thereof

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preparation example Construction

[0044] see Figure 4 , an embodiment of the present invention provides a method for preparing metal-coated spherical cast tungsten carbide powder, which includes:

[0045]Using glutaraldehyde solution to modify chitosan to obtain cross-linked modified chitosan suspension;

[0046] Add spherical cast tungsten carbide to the cross-linked modified chitosan suspension, and then carry out stirring treatment, and take out the modified chitosan / spherical cast tungsten carbide powder obtained after the treatment, and put it into a vacuum drying oven for drying treatment ;

[0047] The modified chitosan / spherical cast tungsten carbide powder after the drying treatment is activated to obtain the activated cast tungsten carbide powder;

[0048] The activated cast tungsten carbide powder is subjected to electroless plating to obtain metal-coated spherical cast tungsten carbide powder.

[0049] In detail, in this example, by modifying chitosan, utilizing chitosan -NH 3 , -OH group to N...

Embodiment 1

[0071] This embodiment provides a metal-coated spherical cast tungsten carbide powder, which is prepared by the following method:

[0072] S1: Weigh 8g of chitosan and add it to 2vol% acetic acid solution, and mechanically stir for 10min to obtain chitosan solution;

[0073] S2: the chitosan solution is added dropwise through a constant pressure funnel into 7ml of a glutaraldehyde solution with a volume fraction of 25vol%, and the stirring is continued for 30min to obtain a cross-linked modified chitosan suspension;

[0074] S3: Weigh 200 g of spherical cast tungsten carbide powder with an average particle size of 70 μm and add it into the cross-linked modified chitosan suspension and stir for 60 min. Take out the treated spherical cast tungsten carbide powder, add it into 20g / L nickel sulfate hexahydrate solution, stir it mechanically for 6h, then add 20ml 40vol% hydrazine hydrate to react for 30min. Then it was washed three times with deionized water, and vacuum-dried to ob...

Embodiment 2

[0079] This embodiment provides a metal-coated spherical cast tungsten carbide powder, which is prepared by the following method:

[0080] S1: Weigh 6g of chitosan and add it to 1vol% acetic acid solution, and mechanically stir for 10 minutes to obtain chitosan solution;

[0081] S2: adding the chitosan solution dropwise through a constant pressure funnel into 5 ml of a glutaraldehyde solution with a volume fraction of 25 vol%, and continuing to stir for 30 min to obtain a cross-linked modified chitosan suspension;

[0082] S3: Weigh 100 g of spherical cast tungsten carbide powder with an average particle size of 56 μm and add it into the cross-linked modified chitosan suspension and stir for 50 min. Then take out the treated spherical cast tungsten carbide powder, add it into 15g / L nickel sulfate hexahydrate solution, stir it mechanically for 5h, then add 15ml 40vol% hydrazine hydrate for 40min reaction. Then it was washed three times with deionized water, and vacuum-dried t...

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Abstract

The invention discloses metal wrapped spherical cast tungsten carbide powder and a preparing method thereof, and relates to the technical field of powder metallurgy. The method comprises the steps that after a glutaraldehyde solution is adopted for modifying chitosan, crosslinking modification chitosan turbid liquid is obtained; after spherical cast tungsten carbide is added in the crosslinking modification chitosan turbid liquid, stirring treatment is conducted, and after drying, activation treatment and chemical plating are sequentially conducted, the metal wrapped spherical cast tungsten carbide powder is obtained. According to the method, the modified chitosan is used for adsorbing metal ions, chelate is formed, prereduction is conducted, deposition of trace metal on the surface of thespherical cast tungsten carbide is achieved, accordingly, the purpose of ceramic powder pretreatment activation is achieved, and the composite powder in which binding metal evenly wraps the sphericalcast tungsten carbide is finally prepared. The method has the characteristics of being low in cost, simple, capable of achieving batch production and the like. Meanwhile, according to the method, through comparison between the chitosan chemical adsorption action and the physical adsorption action in a sensitization-activation method, the binding force between a clad layer and a base body can be effectively improved.

Description

technical field [0001] The invention relates to the field of powder metallurgy, and in particular to a metal-coated spherical cast tungsten carbide powder and a preparation method thereof. Background technique [0002] Hard surface technology is of great significance to promote sustainable economic development and build a conservation-oriented society. Applying hard surface technology to form a hard wear-resistant layer on the surface of metal / alloy can significantly improve the life of the workpiece and save resources. At present, spherical cast tungsten carbide is gradually replacing traditional tungsten carbide powder due to its fine eutectic structure, high hardness and good fluidity, and is widely used in the preparation of PDC drill bits, cutting tools and wear-resistant parts. [0003] In the process of preparing hard facing materials from spherical cast tungsten carbide powder, spherical cast tungsten carbide generally needs to be uniformly mixed with bonding metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C23C18/36C23C18/40C23C18/18
Inventor 刘辛胡杰谭冲
Owner GUANGDONG INST OF NEW MATERIALS
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