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Composite WC-CrC-CoCr thermal spraying powder and preparation method and application thereof

A technology of wc-crc-cocr and thermal spraying, which is applied in the directions of coating, fusion spraying, transportation and packaging, etc., can solve the problems of long ball milling time and the preparation method of thermal spraying powder to be explored

Active Publication Date: 2021-05-07
CHONGYI ZHANGYUAN TUNGSTEN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents do not involve WC+Co+Cr three-component composite powder for thermal spraying. Among them, metal chromium has good ductility, and high-energy ball milling and long ball milling time are required to achieve the dispersion effect.
[0013] Therefore, the existing preparation method of composite WC-CrC-CoCr thermal spray powder needs to be explored

Method used

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  • Composite WC-CrC-CoCr thermal spraying powder and preparation method and application thereof
  • Composite WC-CrC-CoCr thermal spraying powder and preparation method and application thereof
  • Composite WC-CrC-CoCr thermal spraying powder and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0049] According to the method for preparing composite WC-CrC-CoCr thermal spraying powder according to the embodiment of the present invention, first adopt the solution method to mix tungsten trioxide, chromium trioxide, tungsten carbide, cobalt powder, carbon black, water and binder according to a certain Proportional ball milling to prepare ball milling slurry, and then spray drying to obtain spherical particles with the required particle size, which are sintered in a protective atmosphere containing nitrogen and hydrogen by in-situ reduction carbonization reaction, and finally the sintered material is broken and classified. Composite WC-CrC-CoCr thermal spray powder can be obtained. The preparation method is simple in process, the two raw materials are moved forward to the oxide, the cost is low and it is suitable for industrial production, and the preparation process can effectively avoid the gaseous carbon source, and can fine-tune the amount of carbon through the atmosph...

Embodiment 1

[0054] Take the production of 500kg spray powder as an example, prepare the composite WC-CrC-CoCr thermal spray powder of the present invention according to the following process steps:

[0055] Among them, the ratio of raw materials and corresponding parameters are shown in the table below.

[0056] Table 1

[0057]

[0058]

[0059] BET: The BET test method is the abbreviation of the BET specific surface area test method, and the specific surface area refers to the total area of ​​the material per unit mass. Since our self-produced tungsten trioxide has a porous structure, it is necessary to use this method to characterize the particle size of nano-tungsten carbide.

[0060] FSSS: The abbreviation of Fischer particle size test, the basic method is the steady flow air permeation method, that is, the specific surface area and average particle size are measured under the condition of constant air velocity and pressure.

[0061] The above two methods are for testing diff...

Embodiment 2

[0090] Taking the production of 500kg spray powder as an example, prepare the composite WC-CrC-CoCr thermal spray powder of the present invention according to the method described in Example 1, wherein, the difference from Example 1 is: have the raw materials shown in the following table 5 Ratio and corresponding parameters; the first sintering temperature is 1150°C and the sintering time is 100 minutes; the second sintering temperature is 1200°C and the sintering time is 100 minutes; the third sintering temperature is 1200°C and the sintering time is 100 minutes.

[0091] Thus, the final product composite WC-CrC-CoCr thermal spray powder is prepared, wherein the particle size specification is 195kg of 5-38 microns, 220kg of 15-53 microns, and the metal loss is about 5kg (1.0%) during the production process. The densities are: 5-38 micron composite WC-CrC-CoCr thermal spray powder, 4.8-5.2g / cm 3 ; 15-53 micron composite WC-CrC-CoCr thermal spray powder, 4.0-4.5g / cm 3 .

[00...

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Abstract

The invention discloses composite WC-CrC-CoCr thermal spraying powder and a preparation method and application thereof. The preparation method comprises the steps that (1) tungsten trioxide, chromic oxide, tungsten carbide, cobalt powder, carbon black, water and a binder are mixed and subjected to ball milling, so that ball-milled slurry is obtained; (2) drying, atomizing and granulating are conducted on the ball-milled slurry so as to obtain spherical particles; (3) sintering is conducted on the spherical particles in a protective atmosphere containing nitrogen and hydrogen to obtain a sintered material; and (4) the sintered material is crushed and then graded, so that the composite WC-CrC-CoCr thermal spraying powder is obtained. The preparation method is simple in process, the two raw materials are moved forwards to oxides, the cost is low, the method is suitable for industrial production, a gas carbon source can be effectively avoided in the preparation process, the carbon content can be finely adjusted through the atmosphere, the technological process is green and safe, then the prepared composite WC-CrC-CoCr thermal spraying powder has good toughness, and good wear resistance, compactness and corrosion resistance are achieved.

Description

technical field [0001] The invention belongs to the field of nano-cermet composite powder preparation, more specifically the invention relates to a composite WC-CrC-CoCr thermal spray powder and its preparation method and application, which are mainly used in supersonic spraying, surfacing, 3D printing and other surface spraying and additive manufacturing. Background technique [0002] WC-CrC-CoCr thermal spraying powder is WC-Co based cemented carbide powder, similar to WC-Co cemented carbide, with high hardness refractory metal hard compound WC as hard phase, high toughness metal Co etc. as the binder phase, the composite material with good strength and relatively excellent toughness is obtained by powder metallurgy process, which is widely used in oil and gas drilling, geological exploration, mining, roll, mold material, new energy, mechanical processing, durable Grinding parts and other fields are currently one of the most widely used surface spraying materials, and play ...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05C23C4/06B22F1/00B22F9/04B22F9/08
CPCC22C29/08C22C1/058C23C4/06B22F9/04B22F9/082B22F2009/043B22F1/10
Inventor 王韶毅刘承海黄文峰谢永张龙辉杨正锋邹雯娟
Owner CHONGYI ZHANGYUAN TUNGSTEN
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