Laser-assisted cold spray coating method and nozzle apparatus

A laser-assisted, nozzle device technology, applied in the direction of spraying devices, liquid spraying devices, devices for coating liquid on the surface, etc., can solve the problems of large gas consumption, achieve uniform preheating, avoid clogging, and eliminate gas heating devices Effect

Active Publication Date: 2014-07-16
ZHEJIANG UNIV OF TECH +1
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  • Abstract
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  • Claims
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Problems solved by technology

However, when the laser spot is irradiated sideways, only the substrate is preheated. For some hard particles, the carrier gas still needs to b...

Method used

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  • Laser-assisted cold spray coating method and nozzle apparatus
  • Laser-assisted cold spray coating method and nozzle apparatus

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Embodiment 1

[0021] like figure 2 The shown laser-assisted cold spraying nozzle device includes a nozzle 4, one side of the nozzle throat 14 is a nozzle constriction section 15, the other side of the nozzle 4 throat 14 is a nozzle expansion section 12, and the nozzle 4 is in the nozzle constriction section One side of 15 is provided with a high-pressure gas inlet 16 and a light-transmitting window 3 for the laser beam 2 to enter. The light-transmitting window 3 is set away from the nozzle axis 17. The nozzle 4 is provided with a reflector A5 on the nozzle contraction section 15. One side of section 12 is provided with powder inlet 6, reflector B7, reflector C11 and reflector D13, and the laser beam 2 entering from light-transmitting window 3 passes through reflector A5, reflector D13, reflector B7 and After being reflected by the mirror C11, it shoots out from the nozzle expansion section 12, and the powder inlet 6 is located between the mirror D13 and the mirror B7. The high-pressure ga...

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Abstract

The present invention discloses a laser-assisted cold spray coating method and a nozzle apparatus. According to the nozzle apparatus, one side of the nozzle throat portion is a nozzle constriction section, the other side of the nozzle throat portion is a nozzle expansion section, the nozzle side on the nozzle constriction section is provided with a high pressure gas inlet and a light transmittance window for entering of a laser beam, the light transmittance window deviates from the axis line of the nozzle, the nozzle on the nozzle constriction section is provided with a reflecting mirror A, the nozzle side on the nozzle expansion section is provided with a powder inlet, a reflecting mirror B, a reflecting mirror C and a reflecting mirror D, a laser beam entering from the light transmittance window sequentially passes through the reflecting mirror A, the reflecting mirror D, the reflecting mirror B and the reflecting mirror C in the nozzle and then is emitted from the nozzle expansion section, and the powder inlet is positioned between the reflecting mirror D and the reflecting mirror B; and according to the technical scheme, the laser is incident onto the reflecting mirror in the nozzle in a certain angle forming with the nozzle axis line, and the light beam is subjected to multiple reflections through the reflecting mirrors on the inner wall of the nozzle and finally irradiates on the substrate, such that the gas, the powder and the substrate inside the nozzle can be uniformly pre-heated.

Description

technical field [0001] The invention relates to a laser-assisted cold spraying method and a nozzle device, in particular to a supersonic nozzle device for laser cold spraying. Background technique [0002] Cold spraying, also known as cold gas dynamic spraying (Cold Gas Dynamic Spray, CGDS), was proposed by former Soviet scientists in the middle and late 1980s. It is a spraying technology based on the principle of aerodynamics. The principle is to use high pressure The gas (nitrogen, helium, air, or mixed gas, etc.) carries the powder particles into the high-speed airflow, and the supersonic gas-solid two-phase flow is generated through the zoom tube (Laval tube), and the powder particles are accelerated by the supersonic nozzle in a solid state. It collides with the substrate at a very high speed, and deposits on the surface of the substrate to form a coating by generating strong plastic deformation. Unlike thermal spray, which relies on thermal or chemical energy, cold sp...

Claims

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Application Information

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IPC IPC(8): B05C19/04B05C19/06B05B17/06B05B7/16
Inventor 姚建华弗拉基米尔·科瓦连柯张建锋陈智君
Owner ZHEJIANG UNIV OF TECH
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