Preparation method of WC-Co heat spray powder with liquid phase sintering structure characteristics

A thermal spray powder, liquid phase sintering technology, applied in coating, melt spraying, metal processing equipment and other directions, can solve the problems of particle adhesion, reduce fluidity and other problems, achieve high productivity, high fluidity, easy to realize industrial the effect of

Active Publication Date: 2018-07-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional WC-Co thermal spraying powder is generally heat-treated at a temperature lower than 1230°C (serious adhesion between particles will occur when the temperature is too high, reducing fluidity), and the particles are only partially melted during spraying, so the microstructure characteristics of the sprayed powder particles Partially inherited into the coating, which is significantly different from the structure of liquid-phase sintered (sintered at >1320°C) bulk

Method used

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  • Preparation method of WC-Co heat spray powder with liquid phase sintering structure characteristics
  • Preparation method of WC-Co heat spray powder with liquid phase sintering structure characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The WC-Co spherical powder of 15-45 microns, the brown corundum powder of 75-150 microns and the carbon black powder with a particle size of less than 0.5 microns are mechanically stirred and mixed in a certain proportion, and the mass of the brown corundum powder and the WC-Co spherical powder The ratio is 3:1, the mass of carbon black powder is 1% of the WC-Co spherical powder; the above mixed powder is placed in a vacuum furnace for heat treatment, the heat treatment temperature is 1390 ° C, the holding time is 1.5 h, and the furnace temperature rises to 1200 At ℃, 100mbar argon gas is introduced, and after the heat treatment is completed, it is cooled to room temperature with the furnace; the heat-treated powder is passed through a 325-mesh sieve, and the powder that passes through the sieve is collected to obtain a WC-Co thermal spray coating with liquid phase sintered structure characteristics. powder. Utilize X-ray diffraction analysis to detect the phase purity ...

Embodiment 2

[0017] The WC-Co spherical powder of 15-45 microns, the brown corundum powder of 75-150 microns and the carbon black powder with a particle size of less than 0.5 microns are mechanically stirred and mixed in a certain proportion, and the mass of the brown corundum powder and the WC-Co spherical powder The ratio is 4:1, the mass of carbon black powder is 1.5% of the WC-Co spherical powder; the above mixed powder is placed in a vacuum furnace for heat treatment, the heat treatment temperature is 1400°C, the holding time is 1h, and the furnace temperature rises to 1200°C 150mbar of argon gas is introduced, and after the heat treatment is completed, it is cooled to room temperature with the furnace; the heat-treated powder is passed through a 325 mesh sieve, and the powder that passes through the sieve is collected to obtain a WC-Co thermal spray powder with liquid phase sintered structure characteristics. . Utilize X-ray diffraction analysis to detect the phase purity of the spra...

Embodiment 3

[0019] The WC-Co spherical powder of 15-45 microns, the brown corundum powder of 75-150 microns and the carbon black powder with a particle size of less than 0.5 microns are mechanically stirred and mixed in a certain proportion, and the mass of the brown corundum powder and the WC-Co spherical powder The ratio is 5:1, the mass of carbon black powder is 2% of the WC-Co spherical powder; the above mixed powder is placed in a vacuum furnace for heat treatment, the heat treatment temperature is 1420 °C, the holding time is 0.5h, and the furnace temperature rises to 1200 At ℃, 150mbar argon gas is introduced, and after the heat treatment is completed, it is cooled to room temperature with the furnace; the heat-treated powder is passed through a 325 mesh sieve, and the powder that passes through the sieve is collected to obtain a WC-Co thermal spray coating with liquid phase sintered structure characteristics. powder. Utilize X-ray diffraction analysis to detect the phase purity of...

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Abstract

The invention discloses a preparation method of WC-Co heat spray powder with liquid phase sintering structure characteristics, and belongs to the technical field of preparation of hard alloy materials. The method comprises the steps that WC-Co spherical powder with the diameter of 15-45 micrometers, brown fused alumina powder with the diameter of 75-150 micrometers and carbon black powder with thediameter smaller than 0.5 micrometer are used as raw materials, initial mixed materials with evenly-dispersed phases are obtained through mechanical stirring at first, the mixed materials are placedin a vacuum furnace for partial pressure sintering treatment, cooled and screened, and therefore the WC-Co heat spray powder with the liquid phase sintering structure characteristics is obtained. TheWC-Co heat spray powder prepared through the method has high compactness, high flowability and structure characteristics of liquid phase sintering hard alloy, and is short in technological process, high in yield and capable of achieving industrialization easily.

Description

technical field [0001] The invention belongs to the technical field of hard alloy material preparation, and in particular relates to a preparation method of WC-Co thermal spray powder with liquid phase sintering structure characteristics. Background technique [0002] Due to its high hardness and strong wear and corrosion resistance, thermal spraying WC-Co cemented carbide coating is widely used as a surface protection material for engineering parts, which can effectively prolong the service life of various components. However, the development of modern science and technology has put forward higher requirements for the wear resistance of the coating to cope with the increasingly harsh service environment. In order to improve the hardness, fracture toughness and wear resistance of cemented carbide coatings, the existing methods mainly include: (1) adding metal or ceramic particles to the initial WC-based powder; (2) reducing the grain size of WC or making different scales Op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C23C4/06
CPCB22F1/0003C23C4/06B22F1/142
Inventor 王海滨宋晓艳仇庆凡刘雪梅侯超
Owner BEIJING UNIV OF TECH
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