Method for preparing WC-Co powder used for thermal spraying

A technology of thermal spraying and powder, which is applied in the direction of coating, fusion spraying, metal material coating process, etc. It can solve the problems of increasing dewaxing process, crushing and screening, environmental pollution, etc., and achieves high sphericity and fluidity Good, uniform particle size effect

Active Publication Date: 2014-07-16
ADVANCED FOR MATERIALS & EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods need to add molding agents in the preparation process, increase the subsequent dewaxing process, crushing and screening, and at the same time, the dewaxing process will pollute the environment.

Method used

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  • Method for preparing WC-Co powder used for thermal spraying
  • Method for preparing WC-Co powder used for thermal spraying
  • Method for preparing WC-Co powder used for thermal spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) 50Kg of tungsten carbide powder, 21Kg of cobalt acetate and 560g of carbon nanotubes with a particle size of 0.5 μm to 0.6 μm are dissolved in pure water whose mass is 1.5 times that of the total solid mass, and prepared into a mixed slurry with a cobalt content of 10 wt %;

[0047] 2) After ball milling the mixed slurry obtained in step 1) for 6 hours, perform spray granulation. During the spray granulation process, the inlet air temperature is 260°C, the outlet air temperature is 160°C, and the centrifugal atomization speed is 12000r / min , to obtain cobalt salt-coated WC precursor powder;

[0048] 3) Put the precursor powder obtained in step 2) at 1150°C under H 2 :CH 4 Reductive carbonization was carried out for 60 min in an atmosphere of (volume ratio)=98.5:1.5 to obtain WC-Co powder.

[0049] The present invention detects the physical properties and chemical composition of the obtained WC-Co powder, and the results are shown in Table 1. Table 1 shows the physi...

Embodiment 2

[0051] 1) Dissolve 50Kg tungsten carbide powder, 29Kg cobalt acetate, and 600g carbon black with a particle size of 0.5 μm to 0.6 μm in pure water whose mass is 1.8 times the total solid mass, and prepare a mixed slurry with a cobalt content of 12 wt %;

[0052] 2) After ball milling the mixed slurry obtained in step 1) for 8 hours, perform spray granulation. During the spray granulation process, the inlet air temperature is 260°C, the outlet air temperature is 140°C, and the centrifugal atomization speed is 10000r / min , to obtain cobalt salt-coated WC precursor powder;

[0053] In the present invention, the obtained precursor powder is subjected to scanning electron microscope scanning analysis, and the results are as follows: figure 2 as shown, figure 2 The SEM photo enlarged 2000 times for the precursor powder obtained in Example 2 of the present invention, by figure 2 It can be seen that the particle size of the precursor powder obtained by the present invention is un...

Embodiment 3

[0061] 1) 50Kg tungsten carbide powder, 43.5Kg cobalt acetate, and 1.4Kg sucrose with a particle size of 0.5 μm to 0.6 μm were dissolved in pure water whose mass was 3.0 times the total solid mass, and prepared into a mixed slurry with a cobalt content of 17 wt %;

[0062] 2) After ball milling the mixed slurry obtained in step 1) for 8 hours, carry out spray granulation. In the spray granulation, the inlet air temperature is 260°C, the outlet air temperature is 160°C, and the centrifugal atomization speed is 10000r / min , to obtain cobalt salt-coated WC precursor powder;

[0063] 3) Put the precursor powder obtained in step 2) under the condition of 1250°C, in H 2 :CH 4 (Volume ratio)=98.5:1.5 reduction carbonization was performed for 30 minutes to obtain cobalt-coated nano WC-Co powder.

[0064] The present invention detects the physical properties and chemical composition of the obtained WC-Co powder, and the results are shown in Table 1. Table 1 shows the physical propert...

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Abstract

The invention provides a method for preparing WC-Co powder used for thermal spraying. The method includes the following steps that tungsten carbide, water solubility cobalt salt, carbon sources and water are mixed to acquire mixed slurry; after ball-milling and even blending are conducted on the mixed slurry, spray granulation is conducted, and WC precursor powder coated by the cobalt salt is acquired; reduction and carbonization are conducted on the WC precursor powder coated by the cobalt salt, and the WC-Co powder is acquired. According to the method, the water solubility cobalt salt serves as the cobalt sources, the WC precursor powder coated by the cobalt salt is prepared by the adoption of the liquid phase method, so that the cobalt can evenly coat the surface of the WC in a solution molecular mode, reduction and carbonization are conducted on the WC precursor powder coated by the cobalt salt, and the WC-Co powder is acquired. The acquired WC-Co powder by the adoption of the method is even in granularity, controllable in ingredients, even in powder ingredients, free of W2C, eta-Co3W3C, eta-Co6W6C, metal tungsten and the like in the ingredients, the degree of sphericity is high, mobility is good, the decarburization phase and phase decomposition does not occur on the surface of the spraying matrix.

Description

technical field [0001] The invention relates to the technical field of thermal spraying materials, in particular to a method for preparing WC-Co powder for thermal spraying. Background technique [0002] WC-Co-based cermets are the most studied and widely used cermets among carbide-based cermets. The thermal spray coating of WC-Co cermets is widely used in aerospace, Automotive, metallurgy, machinery and other fields. The preparation of WC-Co powder coatings by supersonic flame spraying (HVOF) technology is a research hotspot, which can replace the hard chrome plating technology with high energy consumption and serious pollution to solve the wear resistance of spacecraft and repair worn parts. [0003] In the prior art, the preparation methods of WC-Co powder for metal thermal spraying include melting method, sintering-crushing method, plasma spheroidization method and agglomeration sintering (spray granulation)-breaking method, etc., but melting The spray powder particles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22C23C4/06
CPCB22F9/08B22F9/24C23C4/06
Inventor 戴煜谭兴龙邓军旺王艳艳
Owner ADVANCED FOR MATERIALS & EQUIP
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