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Porous coated member and manufacturing method thereof using cold spray

A porous coating and coating technology, which is applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve the thermal influence of masterbatch, cannot ensure durability, and it is difficult to artificially control coating porosity and Pore ​​distribution etc.

Inactive Publication Date: 2007-02-21
SKC SOLMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have limitations in application, or thermally affect or thermally deform the masterbatch
In addition, it is actually difficult to artificially control the porosity and pore distribution of the coating using the above method
[0005] Also, in corrosive environments such as wastewater or seawater, the thermally conductive metal coatings applied to the tubes of conventional heat exchangers can corrode or form moss on the surface, preventing them from performing their function
Therefore, there is a problem that durability cannot be ensured

Method used

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  • Porous coated member and manufacturing method thereof using cold spray
  • Porous coated member and manufacturing method thereof using cold spray
  • Porous coated member and manufacturing method thereof using cold spray

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A mixture powder (i.e., 0.5Al-0.5AlMg) (eutectic temperature about 400°C) comprising Al powder and AlMg powder in a weight ratio of 50:50 (eutectic temperature about 400°C) was fed into the spraying nozzle at 7 atmospheres to coat on an aluminum substrate.

[0071] The resulting coating was heat treated at about 620°C for 1 hour. The heat-treated substrate was cut and polished, and the cross-section was observed using an optical microscope. Figure 4 A photograph of the cut face of the resulting substrate is depicted.

[0072] according to Figure 4 , it can be seen that the coating is well bonded to the Al substrate. The interface between the Al substrate and the coating is evident due to the encapsulated pores (black parts) in the coating. Porosity was not observed upon coating, but was formed after heat treatment.

Embodiment 2

[0074] A coating was produced under the same conditions as in Example 1 except that the weight of AlMg in the mixture powder was increased so that the metal powder had a composition of 0.3Al-0.7AlMg. The coating is heat-treated, and the cross-section is observed with an optical microscope, the results are as follows Figure 5 shown.

[0075] and Figure 4 Compared with Figure 5 It can be seen that the size of the pores increases, and the increase in porosity can be confirmed even with the naked eye.

Embodiment 3

[0077] The coating layer is formed in such a manner that Al powder / AlMg powder / Al powder / AlMg powder / Al powder are sequentially laminated. The rest of the coating conditions are the same as in Example 1. Subsequently, the resulting coating was heat-treated at 620° C. for 1 hour.

[0078] Figure 6 is an optical micrograph showing a cross-section of a heat-treated substrate. As shown in the figure, pores are hardly observed in the Al layer, but pores are frequently observed in the AlMg layer.

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Abstract

Disclosed is a coated member on which a porous metal coating layer is formed and a method of producing the same. The method comprises providing the mother material, feeding powder having a metal composition, which includes at least two different metals selected from the group consisting of Al, Mg, Zn, and Sn and which is expressed by xA-(1-x)B (0<x<1, where x is a weight ratio of A and B), onto the mother material, supplying high pressure gas to the powder, applying the metal powder using on the mother material by spraying the metal powder using the high pressure gas through an supersonic nozzle, and heat-treating the coated mother material to form the porous coating layer. In the method, it is possible to freely control the pore size and porosity of the coated member. Accordingly, it is available to various members for thermal and mechanical applications.

Description

technical field [0001] The present invention mainly relates to a coated part on which a porous coating is formed and a method for manufacturing the porous coated part, and more particularly, the present invention relates to a method of forming a porous coating on the surface of a master batch using a low-temperature spraying method and wherein Coated parts with controlled pore distribution and pore size of the coating. Background technique [0002] Porous coatings formed on the surface of a part can improve the thermal and mechanical properties of the part. [0003] For example, if a porous coating including open pores communicating with each other is formed on the surface of the heat exchanger, the heat exchanger has an increased area in contact with ambient air, thereby ensuring effective heat exchange performance. At the same time, it is sometimes required that the friction member has lower strength and hardness depending on the relationship of the friction member to sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/00C23C24/04C23C26/00C23C28/02
CPCC23C4/18C23C24/04C23C28/023C23C28/021C23C28/028C23C26/00C23C4/12A62B7/02A62B7/10F21V33/0068
Inventor 高景现李夏勇
Owner SKC SOLMICS
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