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Optimized cold spraying method for saving helium

A cold spray, helium technology, applied in spray device, liquid spray device, pressure inorganic powder coating and other directions, can solve problems such as constraints, and achieve the effect of reducing experimental cost and saving He dosage

Inactive Publication Date: 2011-08-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the price of high pressure He of the same specification is about N 2 6 times the price of He, so the use of He as the working gas is greatly restricted

Method used

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  • Optimized cold spraying method for saving helium

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Such as figure 1 As shown, the application device of this embodiment includes: a high-pressure gas storage tank 1, a control valve 2, a high-frequency heating device 3, a powder tank 4, a supersonic Laval zoom spray gun 5, a thermometer 6 and a pressure gauge 7, wherein: two parallel Helium and nitrogen are respectively stored in the high-pressure gas storage tank 1, the input and output ends of the high-frequency heating device 3 and the powder tank 4 are respectively connected with the high-pressure gas storage tank 1 and the supersonic Laval zoom spray gun 5, the thermometer 6 and the pressure gauge 7 Set on the supersonic Laval zoom spray gun 5, the controllable valve 2 is set in the pipeline and can be opened and closed according to the process requirements.

[0020] The matrix material selected in this example is Al6061 alloy in T6 state, the powder particles are pure Al with an average diameter of 58 μm, and the preheating gas is high-pressure N 2 ; The working ...

Embodiment 2

[0023] The matrix material selected in this embodiment is cast AZ91D magnesium alloy, and the powder particles are Al7075 alloy with an average diameter of 23.3 μm and a shape close to spherical. Both the preheating gas and the working gas are nitrogen, and the pressure and temperature of the working gas are respectively set to 1500Kpa and 280°C. Before the coating is deposited, the surface of the substrate needs to be sandblasted to improve the surface roughness, and then the surface is cleaned with acetone and dried. Take an appropriate amount of Al7075 powder and place it in the powder tank, close the V 2 , V 3 and V 4 valve, opens and regulates V 1 Valves and high-frequency gas heating device, so that the pressure gauge P 1 The reading is controlled at around 1500Kpa. When the reading of the thermometer T rises to 280°C, open and adjust V 3 valve so that P 2 The reading is 1580Kpa, at this time, open the valve V 4 , the moving speed of the spray gun is 2mm / s, and th...

Embodiment 3

[0025] The powder material used in this example is the same as that in Example 1. The base material used is a SUS303 stainless steel base. Before the coating is deposited, the surface of the base needs to be sandblasted to improve the surface roughness, and then the surface is cleaned with acetone and dried. Using the same spraying process parameters as in Example 1, a pure aluminum coating can be prepared on a stainless steel substrate. The resulting coating thickness is about 900 μm and the porosity is less than 1%.

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Abstract

The invention relates to an optimized cold spraying method for saving helium, and belongs to the technical field of the preparation of coatings. In the method, an integral spraying system is preheated by low-cost gas in the process of depositing a coating by cold spraying; when the pressure and temperature of low-cost gas at an inlet of a spray gun are close to those of preset working gas, the spraying is performed by switching to the working gas and filling powder granules; and the coating is deposited on the premise that the spraying process parameters of the powder granules are not changed, and a cold spraying process is optimized by the using amount of the working gas in the preheating process of a spraying saving system. In the optimized cold spraying method, a structure in the prior art is simplified, so the method is convenient to popularize and apply in large range.

Description

technical field [0001] The invention relates to a method in the field of coating preparation, in particular to an optimized cold spraying method that saves helium. Background technique [0002] Cold spraying is a new type of coating technology based on the rational use of aerodynamic principles. It uses heating facilities to preheat the compressed gas. The compressed gas passes through the scaling Laval spray gun to generate supersonic airflow. After the powder particles are accelerated by the gas, they hit the substrate at high speed, and deposit a coating on the surface of the substrate through violent plastic deformation. In the actual cold spraying process, the typical working gas is nitrogen (N 2 ), helium (He) and air, and their mixed gases in a certain proportion. The preheating temperature of the working gas is generally lower than 600 ° C, the pressure is 1-3.5 MPa, and the typical size of the sprayed particles is 5-50 μm. After being accelerated by the spray gun,...

Claims

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Application Information

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IPC IPC(8): C23C24/04B05B7/16
Inventor 卜恒勇卢晨陈彬李晓玲
Owner SHANGHAI JIAO TONG UNIV
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