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Preparation method for scale-adjustable nano porous metal material

A technology of nanoporous and metal materials, applied in the field of preparation of nanoporous metal materials, can solve the problems of high cost, lack of multi-scale features, complex preparation of template method, etc., and achieve the effect of low cost, reliable strength and simple operation

Active Publication Date: 2015-12-23
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The template method is complicated to prepare, high in cost, and not suitable for mass production; while the dealloying method is mainly used to prepare nanoporous bulk materials, and the products prepared by the two methods do not have multi-scale characteristics
Although ultra-fine powder sintering technology is used to prepare nanoporous materials, although it has been reported, a method for preparing nanoporous metal materials with adjustable dimensions is still the first, and this technology is low in cost and easy to mass produce.

Method used

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  • Preparation method for scale-adjustable nano porous metal material
  • Preparation method for scale-adjustable nano porous metal material
  • Preparation method for scale-adjustable nano porous metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Using pure copper powder with an average particle size of 400nm, uniformly mixed with Na with a particle size of 75 μm to 106 μm 2 CO 3 powder, where Na 2 CO 3 The mass content of powder is 11%. Spread the mixed powder evenly in the graphite mold, press the graphite cover plate, and send them into the sintering furnace for sintering. The heating time is 3h, and the sintering temperature T S The temperature is 650°C, and the holding time is 1h.

[0034] The morphology of the porous body is obtained as image 3 shown. During the sintering process, due to the agglomeration of the powder, agglomerated balls are formed inside the porous body, and the balls contain a large number of nanopores with a pore size between 100nm and 500nm. There are also pores between the balls, and the pore diameter is between 5 and 25 μm. At the same time, due to Na 2 CO 3 Due to the action of the powder, a long moat with a length of about 0.1mm is also produced in the porous ...

Embodiment 2

[0035] Example 2: Pure copper powder with an average particle size of 400 nm is used, and NaCL powder with a particle size of 75 μm˜106 μm is uniformly mixed in, wherein the mass content of NaCL powder is 15%. Spread the mixed powder evenly in the graphite mold, press the graphite cover plate, and send them into the sintering furnace for sintering. The heating time is 3h, and the sintering temperature T S The temperature is 700°C, and the holding time is 1h.

[0036] The morphology of the porous body is obtained as Figure 4 shown. can be seen, with image 3 In contrast, there are no nanopores on the agglomerated spheres, and there are mainly two pore scales of micron and millimeter in the porous body.

Embodiment 3

[0037] Example 3: Pure copper powder with an average particle size of 400 nm is used, and KCL powder with a particle size of 75 μm˜106 μm is evenly mixed in, wherein the mass content of the KCL powder is 5%. Spread the mixed powder evenly in the graphite mold, press the graphite cover plate, and send them into the sintering furnace for sintering. The heating time is 3h, and the sintering temperature T S The temperature is 600℃, and the holding time is 1h. After the heat preservation is over, when the temperature drops to 300°C, open the valve to oxidize.

[0038] The morphology of the porous body is obtained as Figure 5 shown. can be seen, with image 3 In contrast, the porous body obtained in this example not only retains the nano-micro-milliscale pore structure, but also significantly increases the roughness of the metal substrate surface, so that the surface wettability of the porous body can be further adjusted.

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Abstract

The invention discloses a preparation method for a scale-adjustable nano porous metal material and belongs to the field of porous material preparation. A pore-forming material is added to superfine metal powder, compression molding of the superfine metal powder is conducted, and then the superfine metal powder is sintered in a vacuum sintering furnace to obtain the porous material. The interior of the porous material contains multiple pore scales of nano-micron-milli, and the dual-adjustment of the inside pore scale of the porous material and the surface roughness scale of a metallic matrix can be achieved by controlling the parameters such as the grain size of the metal powder, the content and grain size of the pore-forming material, the sintering temperature and the holding time and the follow-up treatment process, so that the porous material has super hydrophilicity, and the efficiency of boiling heat transferring is significantly improved. The preparation method for the scale-adjustable nano porous metal material is low in cost, easy to operate and reliable in technology; the product can be used for a wick of a heat pipe, the evaporating surface of an evaporator and other boiling phase-changing heat transferring devices, so that the preparation method for the scale-adjustable nano porous metal material has good application prospects.

Description

technical field [0001] The invention belongs to the field of porous material preparation, and in particular relates to a preparation method of a scale-adjustable nano-porous metal material. Background technique [0002] In recent years, global energy and environmental problems have become serious, and energy conservation and improvement of energy utilization have become one of the most concerned issues at home and abroad. As an important heat transfer technology in the process of energy conversion and utilization, boiling phase change heat transfer technology is widely used in thermal power, geothermal energy, solar energy, nuclear power, aerospace, and microelectronic cooling. Thermal technology can effectively improve energy utilization and solve the heat dissipation problem of high heat flux density in a small space. [0003] At present, improving the surface structure of phase change heat transfer is one of the main methods to enhance boiling heat transfer. The applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08B22F3/11
Inventor 徐进良杨卧龙纪献兵
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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