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Method for preparing fine-grained tungsten and molybdenum coatings by atmospheric plasma spraying method

A technology of plasma and spraying method, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problems of substrate bonding, high porosity of coating, and no reports of tungsten and molybdenum coatings, etc., to achieve Good thermal shock resistance and good mechanical properties

Inactive Publication Date: 2010-09-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the sprayed tungsten and molybdenum powder raw materials used in the preparation of tungsten and molybdenum coatings all use powders with a particle size of more than tens of microns, and the prepared tungsten and molybdenum coatings still have some shortcomings: such as high porosity of the coating, and Combination of substrates, thermal shock performance, etc.
[0006] Ultrafine (nano) surface technology has not been reported to be applied to the preparation of tungsten and molybdenum coatings, and the application of plasma-oriented materials in fusion reactors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Tungsten coating prepared with 16μm tungsten powder as spraying raw material.

[0015] The Φ40mm×8mm oxygen-free copper disc is used as the substrate for spraying, which is pre-treated by sandblasting, and then cleaned with alcohol or acetone to obtain a clean and rough surface. After drying the tungsten powder with a particle size of 16μm at 100°C for 30 minutes, it is sprayed onto the oxygen-free copper substrate by atmospheric plasma spraying technology. The power of the atmospheric plasma spraying equipment is 35KW, and the powder feeding method adopts internal powder feeding. The arc voltage used in the spraying process is 70V, the arc current is 500A, argon is used as the main gas for spraying, hydrogen is used as the auxiliary gas, the flow rate of argon gas is 45L / min, the flow rate of hydrogen gas is 6L / min; the powder feeding rate is 25g / min, The spraying distance is about 120 mm, and the coating thickness is 1 mm. The measured porosity of the obtained coating...

Embodiment 2

[0017] Tungsten coating prepared by spraying 28μm tungsten powder.

[0018] The Φ40mm×8mm oxygen-free copper disc is used as the substrate for spraying, which is pre-treated by sandblasting, and then cleaned with alcohol or acetone to obtain a clean and rough surface. After drying the tungsten powder with a particle size of 28 μm at 100°C for 30 minutes, it is sprayed onto the oxygen-free copper substrate by atmospheric plasma spraying technology. The power of the atmospheric plasma spraying equipment is 35KW, and the powder feeding method adopts internal powder feeding. The arc voltage used in the spraying process is 70V, the arc current is 500A, argon is used as the main gas for spraying, hydrogen is used as the auxiliary gas, the flow rate of argon gas is 45L / min, the flow rate of hydrogen gas is 6L / min; the powder feeding rate is 25g / min, The spraying distance is about 100mm, the coating thickness is 1.5mm, the measured porosity of the obtained coating sample is 7.5%, and ...

Embodiment 3

[0020] Tungsten coating prepared by spraying 0.2μm tungsten powder.

[0021] The Φ40mm×8mm oxygen-free copper disc is used as the substrate for spraying, which is pre-treated by sandblasting, and then cleaned with alcohol or acetone to obtain a clean and rough surface. The tungsten powder with a particle size of 0.2 μm is pre-fired, crushed and granulated, dried at 100°C for 30 minutes, and then sprayed onto the oxygen-free copper substrate by atmospheric plasma spraying technology. The power of the atmospheric plasma spraying equipment is 32.5KW, and the The powder method adopts internal powder feeding. The arc voltage used in the spraying process is 65V, the arc current is 500A, argon is used as the main gas for spraying, hydrogen is used as the auxiliary gas, the flow rate of argon gas is 45L / min, the flow rate of hydrogen gas is 7L / min; the powder feeding rate is 25g / min, The spraying distance is about 120mm, the coating thickness is 0.5mm, the measured porosity of the ob...

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Abstract

The invention discloses a method for preparing fine-grained tungsten and molybdenum coatings by an atmospheric plasma spraying method. The fine-grained tungsten and molybdenum coatings are prepared by performing granulation treatment on ultrafine tungsten powder and molybdenum powder, arranging a protective gas curtain during a spraying process, and adopting atmospheric plasma spraying technology. The process comprises the following steps of: drying the tungsten powder and molybdenum powder with the grain size of 30nm to 30mu m or carbonyl tungsten powder with the average grain size of 15 to 30mu m for later use, wherein a spraying substrate adopts an oxygen-free copper, copper alloy or stainless steel plate; and performing spraying by using atmospheric plasma spraying equipment, wherein the equipment has a power of between 27kW and 40kW, and argon serves as primary spraying gas and hydrogen serves as secondary spraying gas. The method has the advantages that: the fine-grained tungsten and molybdenum coatings prepared by the method of the invention have lower porosity and better mechanical property and thermal-shock resistance, and are suitable for a wear-resistant surface protective layer of a mechanical component, a high-temperature resistant plasma scouring component, such as a first wall material in a nuclear fusion device and the like.

Description

technical field [0001] The invention belongs to the technical field of high-melting-point metals and plasma spraying coatings, and in particular provides a method for preparing fine-grained tungsten and molybdenum coatings by using an atmospheric plasma spraying method. Background technique [0002] The invention relates to atmospheric plasma spraying of tungsten and molybdenum coatings. It has the advantages of high melting point, high strength, high hardness and high wear resistance. In addition, it has a small thermal expansion coefficient, good corrosion resistance and oxidation resistance, and good electrical and thermal conductivity. It has been widely used in industry. For example, it is used as a wear-resistant protective layer on the surface of automobile parts in the automobile industry, and as an armor material facing plasma in nuclear fusion devices. [0003] At present, the commonly used methods for preparing tungsten and molybdenum coatings mainly include che...

Claims

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Application Information

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IPC IPC(8): C23C4/08C23C4/12C23C4/134
Inventor 周张健宋书香郭双全姚伟志葛昌纯
Owner UNIV OF SCI & TECH BEIJING
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