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A high specific surface area transition metal powder and its preparation method

A high specific surface area, transition metal technology, used in metal processing equipment, transportation and packaging, etc., can solve problems such as high cost, complex process, and easy agglomeration of nanoparticles

Active Publication Date: 2021-06-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method usually requires high cost, complicated process or high energy consumption.
Moreover, nanoparticles have the disadvantage of being easy to agglomerate, which has certain restrictions on the application in some occasions that require highly dispersed metals

Method used

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  • A high specific surface area transition metal powder and its preparation method

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Comparison scheme
Effect test

Embodiment 1

[0057] A kind of preparation method of transition metal powder with high specific surface area, its flow chart is shown in figure 1 , including the following steps:

[0058] 1. Mix metal Ta and nickel powder according to the molar ratio of Ta:Ni=1:2, and mix evenly to obtain a mixture of transition metal Ta and nickel.

[0059] 2. According to the proportion, weigh 400g of KCl-NaCl molten salt as the molten salt raw material, put the dried and dehydrated molten salt raw material in an alumina crucible, place it in a sealed reactor, protect it with an inert gas, and raise the temperature to 800°C. Apply a voltage of 2.8V, pre-electrolyze for 3 hours, remove impurities such as metal ions in the molten salt, and obtain a molten salt system after pre-electrolysis.

[0060] 3. Immerse the mixture of transition metal Ta and nickel into the molten salt, keep the temperature at 800° C. for 10 hours, carry out alloying reaction, and obtain the reaction product.

[0061] The reaction ...

Embodiment 2

[0065] A kind of preparation method of high specific surface area transition metal powder, with embodiment 1, difference is:

[0066] In step 1, metal Ta and nickel powder are evenly mixed according to the molar ratio of Ta:Ni=1:8;

[0067] Other embodiments are the same, the specific surface area of ​​the high specific surface area transition metal powder obtained is 6.8m 2 / g.

Embodiment 3

[0069] A kind of preparation method of high specific surface area transition metal powder, with embodiment 1, difference is:

[0070] In step 3, the temperature is raised to 900° C., and the temperature is kept constant for 5 hours to carry out alloying reaction;

[0071] Other implementations are the same.

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Abstract

A high specific surface area transition metal powder and a preparation method thereof belong to the field of metal powder smelting and processing. The method uses transition metal powder as a raw material, metal nickel powder or electrodeposited nickel as an alloying nickel source, and completes the alloying process in a molten salt. The reaction product is removed from the molten salt, cooled, ultrasonically washed and dried to obtain alloy powder. The process of dealloying nickel in the alloy powder is completed by pickling method or electrochemical anodizing method, ultrasonic cleaning and drying with water, and finally the synthesis process of transition metal powder with high specific surface area is realized. The prepared high specific surface area transition metal powder has a specific surface area of ​​0.5-10m 2 / g. This method uses the alloying-dealloying process to adjust the surface and internal structure of the transition metal at the atomic level to achieve the purpose of regulating the specific surface area of ​​the metal powder.

Description

technical field [0001] The invention belongs to the field of metal powder smelting and processing, and in particular relates to a high specific surface area transition metal powder and a preparation method thereof. Background technique [0002] Transition metals such as tantalum, niobium, and titanium have good physical and chemical properties, such as high hardness, high melting point, and strong corrosion resistance, and are widely used in military, alloy, aerospace, and electronics fields. In the application process, the properties of the powder, such as purity, structure, morphology, particle size distribution, specific surface area, etc., are important parameters that determine the properties and performance of the powder material. For example, dense oxide films can be formed on the surface of metal niobium and tantalum powders, and have unidirectional conductivity, so they are important materials for preparing capacitors. This requires it to have high purity, complex ...

Claims

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Application Information

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IPC IPC(8): C25C5/04B22F1/00
CPCC25C5/04B22F1/05
Inventor 宋秋实谢志刚张政谢宏伟宁志强尹华意
Owner NORTHEASTERN UNIV
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