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Aluminum-particle-based method for preparing coating by cold spray deposition

A technology of cold spraying and aluminum particles, which is applied in the field of metal material coating, can solve the problems of economic discount, increase the risk of explosion, and increase the difficulty of particle storage, so as to increase utilization efficiency, reduce the risk of spray gun clogging, and reduce the particle size. The effect of deposition costs

Inactive Publication Date: 2011-08-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of particles with a smaller diameter not only increases the difficulty of particle preservation, but also increases the risk of explosion during spraying
In addition, the use of high-pressure gas deposition coating, its economy is also greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] After the Al6061 aluminum alloy substrate with a reasonable size is sandblasted, the surface is cleaned with acetone, and then dried. After this treatment, it is necessary to ensure that the surface of the aluminum alloy is flat, clean and uniform in roughness. The block is then fixed on a computer-controlled table that can move on a flat surface. Adjust the height of the spray gun so that the height from the spray gun outlet to the substrate surface is 15mm. Take an appropriate amount of dry and pollution-free pure aluminum powder into the powder feeder, adjust the valve and the power of the heating equipment, when the pressure of helium at the inlet of the spray gun is 0.98MPa, the temperature is 300°C and the fluctuation is small, turn on the powder Switch the powder feeder and adjust its working pressure to 1.04MPa for particle deposition. During this process, the substrate was moved at a speed of 3 mm / s, and deposited in two passes. After the powder deposition i...

Embodiment 2

[0023] The AZ91 magnesium alloy substrate with reasonable size is cleaned with acetone after sandblasting, and then dried. The substrate is then fixed on the bench. Adjust the height of the spray gun so that the height from the spray gun outlet to the surface of the magnesium alloy substrate is 10 mm. Take an appropriate amount of aluminum powder and put it into the powder feeder. When the pressure of helium at the inlet of the spray gun is 0.98MPa, the temperature is 270°C and the fluctuation is small, turn on the switch of the powder feeder and adjust its working pressure to 1.04MPa. Perform particle deposition. During this process, the substrate was moved at a speed of 1 mm / s and deposited in a single pass. The thickness of the aluminum coating obtained in this example is 934±51 μm; the porosity is 0.41±0.14%; the corrosion resistance of the obtained pure aluminum coating is similar to that of the Al6061 substrate, and can provide better protection for the magnesium alloy...

Embodiment 3

[0025] The SUS303 stainless steel substrate with a reasonable size is cleaned with acetone after sandblasting, and then dried. The substrate is then fixed on the bench. Adjust the height of the spray gun so that the height from the spray gun outlet to the surface of the stainless steel substrate is 12mm. Take an appropriate amount of aluminum powder and put it into the powder feeder. When the pressure of helium at the inlet of the spray gun is 0.98MPa, the temperature is 280°C and the fluctuation is small, turn on the switch of the powder feeder and adjust its working pressure to 1.04 MPa, for particle deposition. During this process, the substrate was moved at a speed of 2mm / s, and three passes were deposited. The thickness of the aluminum coating obtained in this embodiment is 1226 ± 73 μm; the porosity is 0.53 ± 0.19%.

[0026] Compared with the traditional high-pressure cold spraying of small-sized aluminum particles, the process of the present invention can not only ob...

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Abstract

The invention discloses an aluminum-particle-based method for preparing a coating by cold spray deposition in the technical field of metal material coatings. Helium is used as a working gas and a carrier gas, and high-purity aluminum powder is sprayed onto a matrix subjected to iron silicate particle blasting treatment by using a spray gun to realize coating preparation. Various defects in the prior art, particularly in the thermal spraying aluminum coating preparation process are overcome, risks of small-size particles in storage and cold spray processes are overcome, and the cost of aluminum powder particle deposition is effectively reduced.

Description

technical field [0001] The invention relates to a method in the technical field of metal material coating, in particular to a method for preparing a coating based on cold spray deposition of aluminum particles. Background technique [0002] Aluminum is a metal structure material with a low density used in industry. Compared with other engineering materials, aluminum has better corrosion resistance, and its mechanical properties such as hardness, strength, and plasticity can be adjusted in a wide range. In addition, the aluminum preparation process is simple and the recovery rate is high, so it has been widely used in the fields of automobiles, electronics, electrical appliances, aerospace, national defense, transportation and other fields. Among them, the repair of aluminum alloy parts and the preparation of aluminum and aluminum alloy coatings to protect the base metal materials have become research hotspots. [0003] Since the melting point of aluminum is very low, only 6...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04
Inventor 卜恒勇卢晨陈彬李晓玲
Owner SHANGHAI JIAO TONG UNIV
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