Hot spraying WC/Co powder and coat preparation

A technology of thermal spraying and powder, which is applied in the direction of coating, metal material coating process, molten spraying, etc., can solve the problems of uneven composition, poor fluidity, irregular shape of tungsten carbide, etc., and achieve uniform composition distribution and fluidity Good, good toughness effect

Inactive Publication Date: 2008-03-26
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0015] Cobalt-coated conventional tungsten carbide is a common method to prepare cobalt tungsten carbide cemented carbide powder, but due to the irregular shape of tungsten carbide itself, it causes problems such as uneven composition and poor fluidity after coating.

Method used

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  • Hot spraying WC/Co powder and coat preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Sieve the pure tungsten powder, and take 500g of tungsten powder in the range of 15-100μm for cleaning and drying. Atmospheric plasma spheroidization is carried out on the above tungsten powder, the working gas is Ar gas, and the powder feeding gas is N 2 Gas, spheroidizing voltage 75V, current 500A, powder feeding speed 55g / min, spray distance 45mm, main air flow 1650. Molten tungsten pellets are sprayed directly into water for cooling. After collection, take spherical tungsten powder with a particle size of 15-90 μm and 25g of carbon black and mix and ball mill for 2 hours. The ball-milled material is put into a carbonization furnace and kept at 2000°C for 4 hours under a hydrogen protective atmosphere, and then ball milled for 1 hour for screening. . Take tungsten carbide powder with a particle size of 15-90 μm for strong acid, strong alkali and sensitization and activation treatment. Then put the prepared cobalt sulfate solution, spheroidized tungsten carbide pow...

Embodiment 2

[0047] Sieve the pure tungsten powder, and take 500g of tungsten powder in the range of 15-100μm for cleaning and drying. Atmospheric plasma spheroidization is carried out on the above tungsten powder, the working gas is Ar gas, and the powder feeding gas is N 2 Gas, spheroidizing voltage 70V, current 500A, powder feeding speed 50g / min, spray distance 50mm, main air flow 1600. Molten tungsten pellets are sprayed directly into water for cooling. After collection, take spherical tungsten powder with a particle size of 15-90 μm and 25g of carbon black and mix and ball mill for 3 hours. The ball-milled material is put into a carbonization furnace and kept at 2000°C for 5 hours under a hydrogen protective atmosphere, and then ball milled for 1 hour for screening. . Take tungsten carbide powder with a particle size of 15-90 μm for strong acid, strong alkali and sensitization and activation treatment. Then put the prepared cobalt sulfate solution, spheroidized tungsten carbide pow...

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Abstract

The present invention discloses one kind of hot sprayed WC / Co powder and its coating and their preparation. The hot sprayed WC / Co powder consists of Co 5-25 wt%, C 5-6 wt%, and W for the rest, and is in spherical granular structure of size below 150 micron. The powder is prepared through the following steps: 1. sieving, washing and stoving W powder; 2. spheroidizing W powder; 3. carbonizing spheroidized W powder; and 4. coating with Co to form the WC / Co powder. The hot sprayed WC / Co coating is prepared through spraying the WC / Co powder with ultrasonic flame. The WC / Co powder is compact, high in flowability and homogeneous in components; and the hot sprayed WC / Co coating is compact and homogeneous, and has close combination with the base, micro hardness up to 894HV0.2 and wide application.

Description

technical field [0001] The present invention relates to one. In particular, it relates to a thermal spraying WC / Co powder and coating preparation with high coating density, high hardness and bonding strength, good wear resistance, corrosion resistance and fatigue resistance. Background technique [0002] The inventor of modern cemented carbide first proposed the production of cemented carbide by powder metallurgy in 1923. The process proposed in his patent is still used in the production process of WC-Co cemented carbide today. In 1926, the German Krupp (Krupp) company first carried out the industrial production of cemented carbide. At present, there are about 45 countries in the world that can produce cemented carbide, among which the main producing countries are China, Russia, the United States, Sweden, Japan, Germany, the United Kingdom and France. [0003] The basic characteristics of cemented carbide are: [0004] 1. It has high hardness and wear resistance, and it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06B22F9/00B22F1/02C23C4/129C23C4/134
Inventor 于月光任先京周传让张健
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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