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Method for preparing tungsten coating by using cold air dynamic spraying technology

A cold air power spraying and coating technology is applied in the field of preparing coatings and high melting point metal tungsten coatings. The effect of low content and low residual tensile stress in the coating

Inactive Publication Date: 2012-12-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with physical vapor deposition and chemical vapor deposition technology, plasma spraying has the advantages of simple operation and high deposition efficiency. However, plasma spraying can currently prepare tungsten coatings with low oxygen content mainly by vacuum or low-pressure plasma spraying, while vacuum Or the cost of low-pressure plasma spraying is high, and the size of the sample is limited, and the preheating of the substrate greatly reduces the performance of the copper alloy substrate, especially the dispersion-strengthened copper alloy
However, the tungsten coating prepared by atmospheric plasma spraying has a high oxygen content, which is difficult to meet the requirements.

Method used

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  • Method for preparing tungsten coating by using cold air dynamic spraying technology
  • Method for preparing tungsten coating by using cold air dynamic spraying technology
  • Method for preparing tungsten coating by using cold air dynamic spraying technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The copper alloy used for air-conditioning power spraying is commercially available. The sample size is 20mm×30mm×10mm. The sprayed surface is degreased with acetone, ultrasonically cleaned with anhydrous ethanol, dehydrated and dried, and finally the surface is sandblasted with a sandblasting machine deal with.

[0032] Put the treated sample on the jig for cold air power spraying, and then use cold air power spraying equipment Kinetic 3000 for cold spraying, using nitrogen as the carrier gas and accelerating gas, the process parameters are spraying temperature 730 ° C, pressure 32.2bar, The air flow is 75.0m 3 / h, the spraying distance is 30mm, and the powder feeding amount is 20g / min. The surface morphology of the sprayed samples is as follows figure 2 shown.

Embodiment 2

[0034] The 316L stainless steel used in air-conditioning power spraying is commercially available, and the sample size is 20mm×30mm×10mm. The sprayed surface is degreased with acetone, ultrasonically cleaned with anhydrous ethanol, dehydrated and dried, and finally the surface is sandblasted with a sandblasting machine deal with.

[0035] Put the processed sample on the fixture for cold air power spraying, and then use cold air power spraying equipment Kinetic 3000 for cold spraying, using nitrogen as the carrier gas and accelerating gas, the process parameters are spraying temperature 500 ° C, pressure 20bar, gas The flow rate is 70.0m 3 / h, the spraying distance is 50mm, and the powder feeding rate is 50g / min. The surface morphology of the sprayed samples is as follows image 3 shown.

Embodiment 3

[0037] The copper alloy used for air-conditioning power spraying is commercially available. The sample size is 20mm×30mm×10mm. The sprayed surface is degreased with acetone, ultrasonically cleaned with anhydrous ethanol, dehydrated and dried, and finally the surface is sandblasted with a sandblasting machine deal with.

[0038] Put the treated sample on the fixture of cold air power spraying, and then use cold air power spraying equipment KM-CDS for cold spraying, use helium as the carrier gas and acceleration gas, and the process parameters are spraying temperature of 250°C and pressure of 10bar , the air flow is 75.0m 3 / h, the spraying distance is 10mm, and the powder feeding amount is 10g / min. The surface morphology of the sprayed samples is as follows Figure 4 shown.

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Abstract

The invention provides a method for preparing a tungsten coating by using a cold air dynamic spraying technology, belonging to metal surface engineering. The method specifically comprises: preparing the tungsten coating on a copper alloy or stainless steel substrate from fine tungsten powder used as a raw material by using the cold air dynamic spraying technology. During the preparation of the tungsten coating by cold air dynamic spraying, the particle size of the tungsten powder is controlled at 0.4-10 mu m, nitrogen gas or helium gas can be used as a carrier gas and accelerating gas, and the spraying distance is controlled at 10-50 mm. When nitrogen as is used as the carrier gas and accelerating gas, the temperature of cold air dynamic spraying is controlled at 500-800 DEG C, the air flow pressure is controlled at 20-50bar, and the powder feeding amount is controlled at 10-50 g / min. When helium gas is used as the carrier gas and accelerating gas, the temperature of cold air dynamic spraying is controlled at 200-500 DEG C, the air flow pressure is controlled at 10-30bar, and the powder feeding amount is controlled at 10-20 g / min. The method provided by the invention has the advantages that: the tungsten coating can be prepared on a copper alloy and stainless steel; the prepared tungsten coating is dense, has no oxidation phenomenon existence, intact coating interface bonding and no pores, cracks and other defects; and the tungsten coating with the thickness less than 10 microns can be prepared.

Description

technical field [0001] The invention belongs to the preparation technology of the coating, in particular to the preparation method of the high-melting-point metal tungsten coating, specifically the preparation of the coating on the copper alloy substrate or the stainless steel substrate by adopting the cold air power spraying technology. Background technique [0002] With the construction of the International Thermonuclear Experimental Reactor (ITER) in France, research on plasma facing materials (Plasma Facing Materials: PFM) and plasma facing components (Plasma Facing Components: PFC) is a hot, difficult and cutting-edge research topic in fusion research at present, and is directly related to whether fusion reactors can be realized in the future. After years of research, currently recognized and available plasma-oriented materials mainly include high-Z (atomic number) W and low-Z C and Be. In the next-generation magnetic confinement fusion device based on D+T reaction rep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/04
Inventor 葛昌纯郭双全张小锋
Owner UNIV OF SCI & TECH BEIJING
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