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Method for preparing transition metal carbide powder strengthened by electric field and/or ultrasonic field

A transition metal and ultrasonic field technology, applied in the direction of electrolysis process, electrolysis components, etc., can solve the problems of reduction and oxygen removal of low-valent oxides and solid solutions of transition metals, high oxygen content of products, etc., and achieve enhanced carbonization kinetics The effect of high process and product quality and large heat capacity

Active Publication Date: 2020-09-22
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses oxides as raw materials, and the reduction and oxygen removal of transition metal subvalent oxides and solid solutions in the later stage of the reaction are difficult, resulting in high oxygen content in the product.

Method used

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  • Method for preparing transition metal carbide powder strengthened by electric field and/or ultrasonic field
  • Method for preparing transition metal carbide powder strengthened by electric field and/or ultrasonic field
  • Method for preparing transition metal carbide powder strengthened by electric field and/or ultrasonic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] A method for preparing transition metal carbide powder by electric field strengthening, comprising the following steps:

[0087] Step 1. Preparation of high melting point transition metal-carbon sintered sheet

[0088] (1) Mix metal Nb and amorphous carbon powder according to a molar ratio of 1:1, add polyvinyl alcohol ethanol saturated solution accounting for 2wt% of the total mass percentage of metal Nb and amorphous carbon powder, and mix uniformly to obtain a mixture;

[0089] The metal Nb powder has a particle size of 1 μm, and the amorphous carbon powder has a particle size of 0.2 μm.

[0090] (2) Weighing 2 g of the mixture and molding it under 10 MPa pressure to obtain a cylindrical sheet, the diameter of the cylindrical sheet is 15 cm, and the thickness is 2-3 mm;

[0091] (3) Put the cylindrical sheet in a resistance furnace, and sinter it at 1000° C. for 3 hours under an Ar atmosphere to obtain a high melting point transition metal-carbon sintered sheet.

...

Embodiment 2

[0101] A method for preparing transition metal carbide powder by ultrasonic field strengthening, the same as in Example 1, the difference is:

[0102] (1) In step 3, the high melting point transition metal-carbon sintered piece is connected to the stainless steel wire, the high melting point transition metal-carbon sintered piece is immersed in the molten salt system after pre-electrolysis, and the high melting point transition metal-carbon sintered A 20kHZ ultrasonic field was applied to the stainless steel wire of the sheet through an ultrasonic generator, and the carbonization reaction time was 8h. Compared with Comparative Example 1, ultrasonic vibration can accelerate the diffusion of carbon into the interior of niobium, and eliminate the influence of the natural oxide layer formed on the surface on the kinetics of the carbonization process. At the same time, it can refine the carbide product and obtain carbide powder with a particle size of less than 100nm.

[0103] Other...

Embodiment 3

[0106] A method of electro-ultrasonic coupling field strengthening for preparing transition metal carbide powder, the same as in Example 1, the difference lies in:

[0107] (1) While applying the electric field in step 3, use the KMD-K1 ultrasonic generator to apply an ultrasonic field with a frequency of 20kHZ on the stainless steel wire, and the carbonization reaction time is 4h;

[0108] Other implementations are the same.

[0109] The flow chart of the method for preparing NbC by electro-ultrasonic coupled field assisted carbonization is shown in Figure 4 .

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Abstract

A method for preparing transition metal carbide powder by intensifying electric field and / or ultrasonic field, belonging to the field of transition metal ceramic powder smelting. The method is as follows: mix high melting point transition metal powder and carbon powder according to the proportion, then add a binder, mix, press and roast to obtain a sintered sheet; dehydrate the molten salt, perform pre-electrolysis, and immerse the sintered sheet into the dehydrated molten metal. In the salt, electric field and / or ultrasonic field are applied to strengthen the carbonization reaction, and after cleaning and drying, transition metal carbide powder is obtained. This method uses transition metals as raw materials, uses a molten salt medium environment, and uses electric field and / or ultrasonic field strengthening methods to prepare carbide powder, which can effectively solve the problems of incomplete oxygen removal in oxides and low product quality. It can achieve efficient and high-quality preparation of transition metal carbide powder at lower temperatures, and the equipment used is simple to operate.

Description

technical field [0001] The invention belongs to the field of transition metal ceramic powder smelting, and in particular relates to a method for preparing transition metal carbide powder strengthened by an electric field and / or an ultrasonic field. Background technique [0002] Transition metal carbide powder formed by transition metals such as tantalum, niobium, titanium, etc. is a non-oxide ceramic powder, which is used for alloy reinforcement phase, catalyst, optical material, aviation material, etc. due to its good physical and chemical properties. field. Among them, as the reinforcement phase of the alloy, that is, the reinforcement phase of the matrix material, is the most important application of transition metal carbide powder. The preparation methods of transition metal carbide powder include carbothermal reduction method, direct contact carbonization method, high temperature self-propagating synthesis method, flame synthesis method, plasma sintering method, molten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00
Inventor 宋秋实张政谢宏伟宁志强尹华意
Owner NORTHEASTERN UNIV LIAONING
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