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Cold air powered spraying method and device

A technology of cold air power spraying and nozzle, applied in spraying device, liquid spraying device, etc., can solve the problem of powder particle acceleration, and achieve the effect of overcoming blockage, conducive to powder feeding, and continuous cross-section

Active Publication Date: 2008-07-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the end of the powder feeding pipe is a dead angle of the working gas velocity field, and its velocity is much lower than the average velocity of the working gas at this part, so the powder particles sent at this part cannot be effectively accelerated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Nitrogen is used as the working gas, the particle diameter of the copper powder to be sprayed is 10 μm to 30 μm, and the substrate is an aluminum plate. The working gas pressure at the nozzle inlet is 2.5MPa and the temperature is 250°C. Nozzles in the form of image 3 As shown, the lengths of the divergent section and the straight section of the outer body 8 are 60mm and 20mm respectively, and the corresponding inner flow channel is straight (cylindrical) with a diameter of Ф7.4mm. The effective length of the nozzle throat is 5mm. The diameter of the guide terminal 9 inside the nozzle corresponding to the cross-sectional circle of the throat is Ф6.7mm, and the annular cross-sectional area of ​​the flow channel at the throat is 7.75mm 2 , the ratio of the cross-sectional area of ​​the outer body 8 cylinder to the cross-sectional area of ​​the diversion terminal 9 corresponding to the throat is 1.22. The diversion terminals 9-1 and 9-2 are respectively made of copper ...

Embodiment 2

[0074] Nitrogen is used as the working gas, the particle diameter of the copper powder to be sprayed is 20 μm to 50 μm, and the substrate is an aluminum plate. The working gas pressure at the nozzle inlet is 2.5MPa and the temperature is 380°C. Nozzles in the form of image 3 As shown, the lengths of the divergent section and the straight section of the outer body 8 are 65 mm and 20 mm respectively, and the corresponding inner flow channel is straight (cylindrical) with a diameter of Ф8.1 mm. The effective length of the nozzle throat is 10mm. The diameter of the guide terminal 9 inside the nozzle corresponding to the throat cross-section circle is Ф7.6mm, and the annular cross-sectional area of ​​the flow channel at the throat is 6.17mm 2 , the ratio of the cross-sectional area of ​​the outer body 8 cylinder to the cross-sectional area of ​​the diversion terminal 9 corresponding to the throat is 1.14. Both the diversion terminals 9-1 and 9-2 are made of copper, and the diam...

Embodiment 3

[0076] Nitrogen is used as the working gas, the particle diameter of the copper powder to be sprayed is 80 μm to 120 μm, and the substrate is an aluminum plate. The working gas pressure at the nozzle inlet is 3.0MPa and the temperature is 600°C. Nozzles in the form of image 3 As shown, the lengths of the divergent section and the straight section of the outer body 8 are 100mm and 40mm respectively, and the corresponding inner flow channel is straight (cylindrical) with a diameter of Ф8.7mm. The effective length of the nozzle throat is 10mm. The diameter of the guide terminal 9 inside the nozzle corresponding to the throat cross-sectional circle is Ф8.3mm, and the annular cross-sectional area of ​​the flow channel at the throat is 5.34mm 2 , the ratio of the cross-sectional area of ​​the outer body 8 cylinder to the cross-sectional area of ​​the diversion terminal 9 corresponding to the throat is 1.10. The diversion terminals 9-1 and 9-2 are made of stainless steel and copp...

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Abstract

The present invention relates to cold gas powered spraying method and device for spraying metal powder to the surface of sample or workpiece to form coating. The present invention features that work gas is first heated, then fed to the converging section in the upstream of the nozzle flow passage, and expanded and speeded in the divergent section of the nozzle, while the metal powder to be sprayed is fed directly to the converging section in the upstream of the nozzle through the powder feeding channel and two powder exhausting holes in some angle with the axis of the nozzle. The present invention has no contamination and jamming of the nozzle caused by the sprayed powder and easy manufacture of the nozzle.

Description

(1) Technical field [0001] The invention relates to a method and a device for preparing a coating, in particular to a method and a device for preparing a coating by spraying a metal powder material on the surface of a sample or a workpiece by using a cold air power spraying method. (2) Background technology [0002] Conventional means of preparing coatings is by employing various thermal spraying methods including: flame spraying, arc spraying, plasma spraying, high velocity oxy-fuel spraying (HVOF). At the end of the last century, a new type of coating preparation method based on aerodynamic principles - cold air dynamic spraying (referred to as cold spraying or dynamic spraying) emerged. In cold air power spraying, the powder particles to be sprayed are driven and accelerated to high velocities by some kind of "cold" air injection device without melting. The powder particles with high kinetic energy hit the surface of the sample or workpiece to be sprayed to form a firm a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05B7/14B05B7/02
Inventor 宋洪伟张俊宝史弼
Owner BAOSHAN IRON & STEEL CO LTD
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