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Preparation method of tungsten carbide-cobalt or tungsten carbide-cobalt-chromium thermal spraying powder

A technology of thermal spraying powder and tungsten carbide powder, applied in coating, chemical industry, melt spraying and other directions, can solve the problems of low production efficiency, high energy consumption, long production cycle, etc., to solve the problem of long production cycle and uniform heating , the effect of reducing the production process

Active Publication Date: 2014-02-05
CENT SOUTH UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a tungsten carbide-cobalt or tungsten carbide powder for the problems of long production cycle, low production efficiency and large energy consumption when preparing tungsten carbide-cobalt or tungsten carbide-cobalt-chromium thermal spray powder by traditional methods. -A method for preparing cobalt-chromium thermal spraying powder, the method has simple process flow, high production efficiency, uniform powder composition, high sphericity and good fluidity

Method used

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  • Preparation method of tungsten carbide-cobalt or tungsten carbide-cobalt-chromium thermal spraying powder

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Embodiment 1

[0019] Embodiment 1: WC-17Co thermal spray powder

[0020] First, add 83wt% tungsten carbide powder and 17wt% cobalt powder into the ball mill, add deionized water at the same time, control the solid content to 70%, wet milling, wet milling time 12h; after wet milling, the average particle size of the mixed powder is 0.1 micron ~10 microns, add polyethylene glycol accounting for 3% of the mixed powder mass fraction, stir for 2 hours, and then granulate in a spray drying tower to obtain granulated powder; the inlet temperature is controlled at 260°C, and the outlet temperature is controlled at 110°C; Pass the granulated powder through 200-mesh and 900-mesh double-layer vibrating sieves to obtain powder in the sieve with a particle size of 15-75 microns, and return the powder on the 200-mesh sieve and the powder under the 900-mesh sieve to wet milling; Degreasing treatment is carried out in the furnace at a temperature of 800°C for 4 hours to fully remove the polyethylene glycol...

Embodiment 2

[0022] Embodiment 2: WC-10Co-4Cr thermal spray powder

[0023] First, add 86wt% tungsten carbide powder, 10wt% cobalt powder and 4wt% chromium powder into the ball mill, add deionized water at the same time, control the solid content to 75%, wet grinding, wet grinding time 12h; after wet grinding, mix The average particle size of the powder is 0.1 micron to 10 micron, add polyethylene glycol accounting for 2% of the mass fraction of the mixed powder, stir for 2 hours, and then granulate in a spray drying tower to obtain a granulated powder; the inlet temperature is controlled at 260°C, and the outlet The temperature is controlled at 110°C; the granulated powder is passed through a 200-mesh and 900-mesh double-layer vibrating sieve to obtain a powder in the sieve with a particle size of 15-75 microns, and the powder on the 200-mesh sieve and the powder under the 900-mesh sieve are returned to wet grinding; the obtained The powder in the sieve is degreased in a tube furnace at a...

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Abstract

The invention relates to a preparation method of tungsten carbide-cobalt or tungsten carbide-cobalt-chromium thermal spraying powder. The preparation method includes: proportionally mixing tungsten carbide powder with cobalt powder or tungsten carbide powder, cobalt powder and chromium powder, compounding slurry, performing spray granulation, screening and degreasing granulated powder prior to rapidly sintering the granulated powder in a vertical high-temperature sintering furnace, enabling the powder to continuously and uniformly pass through a heating area and a cooling area in a free-falling motion mode, completing sintering in the heating area for 0.1-5s at the sintering temperature of 1000-1700 DEG C in the nitrogen protective atmosphere, and performing classified screening for the sintered powder as required finally. The preparation method solves the problems of long production cycle, low production efficiency, high energy consumption and the like when tungsten carbide based composite spherical thermal spraying powder is prepared by a traditional method, is simple in technological process, capable of achieving continuous production, energy-saving and environment-friendly and can be widely applied to the fields of aerospace, machine manufacturing, petrochemical engineering and the like, and the obtained powder is uniform in component, high in sphericity degree and good in fluidity.

Description

technical field [0001] The invention discloses a preparation method of tungsten carbide-cobalt or tungsten carbide-cobalt-chromium thermal spraying powder, and relates to the technical fields of thermal spraying materials, powder metallurgy materials and hard alloys. Background technique [0002] Tungsten carbide belongs to the ceramic phase, which has the advantages of high melting point, high hardness, poor electrical and thermal conductivity, and stable chemical properties. It is an ideal material for preparing wear-resistant and corrosion-resistant coatings. The adhesion between the particles and the base material is poor, and it is easy to oxidize when the temperature rises in the air, so pure tungsten carbide powder is rarely used alone as a thermal spraying powder material, and usually needs to be added with metals or alloys such as Co, Ni, Ni-Cr Used as binder phase to make sintered powder or coated powder for thermal spraying. The widely used tungsten carbide-cobal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C29/08C23C4/10B22F1/00C23C4/06
CPCY02P20/10
Inventor 姚萍屏贡太敏何俊
Owner CENT SOUTH UNIV
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