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Preparation method of high-density cold sprayed metal deposition body based on mixed powder

A technology of mixing powder and cold spraying, applied in the field of material engineering, to achieve the effect of poor fluidity, high deposition efficiency, and high flight speed

Active Publication Date: 2018-06-26
XUZHEN NEW ENERGY TECH (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem that conventional atomized metal powder is difficult to simultaneously obtain high-density deposits and high deposition efficiency through cold spray technology, the purpose of the present invention is to provide a method for preparing a high-density cold-spray metal deposit based on mixed powder. The method has the advantages of high deposition efficiency and high density of the deposited body, and is low in cost, suitable for scale-up production

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  • Preparation method of high-density cold sprayed metal deposition body based on mixed powder
  • Preparation method of high-density cold sprayed metal deposition body based on mixed powder
  • Preparation method of high-density cold sprayed metal deposition body based on mixed powder

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Embodiment 1

[0042] Metal pure copper is widely used as an electrical and thermal conductive part due to its high electrical and thermal conductivity. For the Cu system, the roller ball mill will be as follows figure 1 The particle size distribution shown in (a) and (b) are both spherical atomized Cu powder and dendritic electrolytic Cu powder with a particle size distribution of 10-30 μm, which are fully mixed according to the mass ratio of 3:1, 1:1, and 1:3, respectively. , to obtain the desired mixed powder.

[0043] As a comparison, pure atomized Cu powder and pure electrolytic Cu powder were used to prepare coatings under the same spraying parameters. Choose 304 stainless steel with a thickness of 3mm as the substrate, clean and dry the surface of the substrate with acetone before spraying, and then use 40# brown corundum sand to roughen the surface of the substrate by sandblasting under the condition of compressed air pressure of 0.6MPa Treatment, so that the roughness can reach Ra...

Embodiment 2

[0046] Studies have shown that pure Ni coating has excellent resistance to neutral salt solution, acid solution and high temperature molten salt corrosion resistance. Unlike the Ni coating produced by the electroplating process, which produces a large amount of waste liquid containing heavy metals, the cold spraying process will not cause environmental pollution, which is a green material preparation technology. The compactness of the coating is critical to corrosion performance. However, studies have shown that the use of conventional atomized Ni powder can only be achieved when expensive helium is used as the accelerating gas, or the powder is preheated to above 600°C with a special device at a higher particle velocity (>600m / s). A dense Ni coating is obtained.

[0047] see Figure 5 , wherein, (a) the morphology of the electrolytic nickel powder, (b) the section of the electrolytic nickel powder, (c) the morphology of the gas atomized nickel powder, (d) the section of the...

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Abstract

The invention discloses a manufacturing method for a high-density cold spraying metal sedimentary body based on mixed powder and belongs to the technical field of material engineering. The method includes the following steps that firstly, conventional atomized metal powder and ionized metal powder or hydroxyl metal powder are mechanically mixed to manufacture the mixed powder, wherein the conventional atomized metal powder and the ionized metal powder or the hydroxyl metal powder adopt the same metal components; and secondly, the surface of a base body or the surface of a workpiece to be sprayed is pretreated, the mixed powder serves as spraying powder, a coating or a blocky material is deposited through a cold spraying method. By the adoption of the method, the characteristic that the deposition efficiency of the electrolyzed / hydroxyl metal powder is high is maintained, the defects that the electrolyzed / hydroxyl metal powder is pool in fluidity and prone to blocking a spray gun are overcome, pores in the deposited electrolyzed / hydroxyl metal powder are closed through the strong tamping effect generated by impact of conventional atomized powder, and the completely-dense metal sedimentary body is obtained.

Description

technical field [0001] The invention belongs to the technical field of material engineering, and in particular relates to a method for preparing a high-density cold-sprayed metal deposition body based on mixed powder. Background technique [0002] Cold Spraying (CS) is a material technology based on aerodynamics. By feeding micron-sized particles into the high-speed airflow in the spray gun, they are accelerated to hit the substrate at high speed (300-1200m / s) in a completely solid state, and material deposition is achieved by severe plastic deformation at the particle / substrate interface. The lower deposition temperature makes it possible to avoid the oxidation of the particles during the acceleration process to the greatest extent when depositing metal particles and other oxygen-sensitive materials, making it possible to prepare pure and non-oxidized metal and alloy coatings, especially suitable for temperature-sensitive , easy to oxidize, easy phase change material. Und...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/04
CPCC23C24/04
Inventor 雒晓涛李玉娟李长久
Owner XUZHEN NEW ENERGY TECH (SHANGHAI) CO LTD
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