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Method for directly preparing porous metal product by molten salt electrolysis

A technology of porous metal and molten salt electrolysis, which is applied in the field of direct preparation of porous metal products by molten salt electrolysis, which can solve the problems of low strength and easy damage, and achieve the effect of strength improvement

Inactive Publication Date: 2012-06-20
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the powder metallurgy method is used to prepare high-porosity and thin-walled products, due to the limitation of sintering temperature, its strength is low and it is easy to be damaged.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Step 1, using TiO with a particle size of 200 μm 2 powder as raw material, TiO 2 After the powder is mixed evenly with the pore-forming agent calcium carbonate, it is pressed under the condition of 150MPa to form a cylindrical body with a thickness of Φ95mm×810mm and a wall thickness of 5mm, and then the green body is sintered at a temperature of 950°C for 4 hours to obtain Blank; The mass content of described calcium carbonate is TiO 2 20% of the total mass of powder and calcium carbonate;

[0016] Step 2, using the blank described in step 1 as the cathode, graphite as the anode, CaCl 2 It is an electrolyte, and under the protection of argon, the electrolysis temperature is 900°C, and the electrolysis voltage is 3.0V-3.2V, and the molten salt electrolysis is performed for 20h to obtain porous metal titanium with a porosity of 36%.

[0017] The porous metal titanium prepared in this example can be made into a titanium filter with a maximum pore diameter of 150 μm aft...

Embodiment 2

[0019] This embodiment is the same as embodiment 1, wherein the difference is that the metal oxide powder used is Fe 2 o 3 Powder, Al 2 o 3 powder, CoO powder, NiO powder, V 2 o 5 Powder, Nb 2 o 5 Powder, Ta 2 o 5 Powder, CrO 2 Powder, ZrO 2 Powder, MoO 3 Powder, WO 3 Powder, MnO 2 powder, CuO powder or ZnO powder, or TiO 2 Powder, Fe 2 o 3 Powder, Al 2 o 3 powder, CoO powder, NiO powder, V 2 o 5 Powder, Nb 2 o 5 Powder, Ta 2 o 5 Powder, CrO 2 Powder, ZrO 2 Powder, MoO 3 Powder, WO 3 Powder, MnO 2 powder, CuO powder and ZnO powder at least two.

Embodiment 3

[0021] Step 1. Use TiO with a particle size of 50 μm 2 powder as raw material, TiO 2 After the powder is uniformly mixed with the pore-forming agent calcium carbonate, it is pressed into a rod-shaped green body of Φ50mm×180mm under the condition of a pressure of 250MPa, and then the green body is sintered at a temperature of 950°C for 10 hours to obtain a blank; the calcium carbonate The mass content is TiO 2 12% of the total mass of powder and calcium carbonate;

[0022] Step 2, using the blank described in step 1 as the cathode, graphite as the anode, CaCl 2 It is an electrolyte, under the protection of argon, the electrolysis temperature is 900°C, and the electrolysis voltage is 3.0V-3.2V, and the molten salt is electrolyzed for 30h to obtain porous metal titanium with a porosity of 20%.

[0023] The porous metal titanium prepared in this example can be processed into a titanium filter with a maximum pore diameter of 30 μm after finishing, and its crushing strength is ≥ ...

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Abstract

The invention discloses a method for directly preparing a porous metal product by molten salt electrolysis. The method comprises the following step of: performing molten salt electrolysis for 4 to 30 hours in the presence of argon shielding gas under such conditions that a metal blank is used as cathode, graphite as anode and CaCl2 is used as electrolyte, to obtain a porous metal product with a porosity of 15 to 78%. The temperature of electrolysis is 850 DEG C to 1200 DEG C, the voltage of electrolysis is 2.8 V to 3.8 V, and the metal blank is prepared from metal oxide powders as raw materials by the conventional method in which a pore-forming agent is added prior to pressing and sintering. The porous metal product is prepared by molten salt electrolysis of the metal blank. Since the deoxidation process is an exothermic process, the temperature is increased to produce a sintering effect during cathode reduction, as a result, the strength of the product is increased. Besides, the sintering effect as local sintering effect has a small impact on deformation of the product.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous metal products, and in particular relates to a method for directly preparing porous metal products by molten salt electrolysis. Background technique [0002] Metal porous materials are composed of rigid skeleton and internal pores, which not only have the characteristics of metals, but also have a series of special functions caused by the existence of pores. A new engineering material with excellent physical properties and good mechanical properties. Such as low density, high rigidity, large specific surface area, good energy absorption and vibration reduction performance, good noise reduction effect, high electromagnetic shielding performance, and play an extremely important role in the fields of environmental protection and aerospace. Such as ultra-light structural parts, divergent panels, noise and deicing devices, and sweat cooling devices in the aerospace sector; various electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/04
Inventor 杜继红李晴宇李争显马秀芬宁晓辉
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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