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Preparation method of metal powder and alloy powder

A technology of alloy powder and metal, applied in the field of preparation of metal and its alloy powder, can solve the problems of particle enlargement, metal or alloy sintering, and difficulty in obtaining metal or alloy powder, etc.

Inactive Publication Date: 2017-06-30
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high working temperature of the electrolysis process, the metal or alloy continuously generated during the electrolysis process is severely sintered and the particles increase, resulting in the product becoming a dense metal block, and it is difficult to obtain metal or alloy powder.

Method used

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  • Preparation method of metal powder and alloy powder
  • Preparation method of metal powder and alloy powder
  • Preparation method of metal powder and alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Commercially available 0.1~0.2μm Ta 2 o 5 Take 2g of the powder, press it into a test piece with a diameter of 20mm and a thickness of 3mm under 8MPa, and sinter it in the air at 600°C for 3 hours, and the obtained Ta 2 o 5 Audition. After the test piece is tightly wrapped with molybdenum mesh, then a thin molybdenum wire is wound on the molybdenum wire as the cathode, a graphite rod is used as the anode, and MgCl with a melting molar ratio of 2:1 2 A mixture of NaCl and excess magnesium oxide is used as the electrolyte. In an argon atmosphere, the temperature is 600°C, the voltage is 1.4V, and the electrolysis is performed for 5 hours. After the electrolysis is completed, the cathode is raised from the molten salt liquid level and cooled to room temperature in the electrolytic cell. Finally, the product was taken out, washed with 0.1N dilute hydrochloric acid, and vacuum-dried at 60° C. to obtain metal Ta powder. figure 1 For the XRD pattern; figure 2 for TEM pho...

Embodiment 2

[0022] Commercially available 0.1~0.2μm TiO 2 Take 3g of the powder, wrap it tightly with a foamed nickel sheet, then wrap a stainless steel wire on the stainless steel wire as a cathode, use a graphite rod as an anode, and melt CaCl 2 And add the mixture of excess calcium oxide as the electrolyte. In the argon atmosphere, the temperature is 850 ° C, the voltage is 3.2 V, and the electrolysis is performed for 4 hours. After the electrolysis is completed, the cathode is raised from the molten salt liquid level and cooled to room temperature in the electrolytic cell before taking it out. The product was washed with distilled water and dried in vacuum at 60°C to obtain metal Ti powder.

Embodiment 3

[0024] Take 5g of commercially available NiO powder of 0.1~0.2μm, press it under 5MPa into two test pieces with a diameter of 20mm and a thickness of 5mm, and sinter them in air at 600°C for 2 hours. Wrap the test piece tightly with stainless steel mesh, then wrap stainless steel wire on the stainless steel wire as cathode, use graphite rod as anode, melt LiCl and KCl with a molar ratio of 1:1 and add excess Li 2 The mixture of O is the electrolyte. In an argon atmosphere, the temperature is 600°C, the voltage is 2.8V, and the electrolysis is performed for 3 hours. After the electrolysis is completed, the cathode is raised from the molten salt level and cooled to room temperature in the electrolytic cell. Wash and dry in vacuum at 60°C to obtain metal Ni powder.

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Abstract

The invention provides a preparation method of metal powder and alloy powder. The preparation method comprises the following steps that powder of an oxide or a mixture of several oxides or a pressed piece is composited with a metal current collector to be served as a cathode, graphite is served as an anode, molten alkaline earth metal halide with excessive alkaline earth metal oxides or alkali halide with excessive alkali metal oxides or a mixture of the molten alkaline earth metal halide and the alkali halide is served as an electrolyte, in a protective atmosphere, electrolysis is performed for 1-5 hours with the electrolysis temperature being 400-900 DEG C and the electrolysis voltage being 1.4-3.2 V, a product is taken out after being cooled to the normal temperature, then the product is washed in distilled water, dilute acid or an organic solvent, and the metal powder or alloy powder is obtained after the product is subjected to vacuum drying. According to the preparation method of the metal powder and alloy powder, the particle size is controllable, and thus the metal powder and alloy powder are directly prepared.

Description

technical field [0001] The invention belongs to the preparation method of metal and alloy powder thereof, in particular to the preparation method of refractory metal and alloy powder thereof. Background technique [0002] Metals and alloys play an important role in the national economy and are widely used in chemical industry, metallurgy, shipbuilding, automobile, aerospace industry, national defense technology and other fields. In particular, refractory metals and their alloys, represented by titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, tungsten, and molybdenum, occupy an important position in the national economy, especially in cutting-edge fields. At present, the preparation methods of industrial pure metals mainly include carbothermal reduction method, metal thermal reduction method, electrothermal method and electrolysis method. There are mainly methods for preparing alloys such as high-temperature co-melting and powder metallurgy. The former us...

Claims

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Application Information

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IPC IPC(8): C25C5/04
CPCC25C5/04
Inventor 李伟刘志强曹洪杨郭秋松朱薇高远陶进长张魁芳金明亚
Owner GUANGDONG INST OF RARE METALS
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