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A kind of nano-VC whisker and preparation method thereof

A whisker and nanotechnology, applied in the field of nano-VC whiskers and its preparation, can solve the problems of industrial mass production limitations, whisker yield improvement, unfavorable industrial production, etc., and achieve shortened atomic migration distance and long diameter Large ratio, beneficial to the effect of industrial production

Active Publication Date: 2020-04-28
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The CVD method can obtain whiskers with high purity and good shape, but the purity of the reaction raw materials is very high, and the price of the raw materials is relatively expensive, which correspondingly increases the production cost and the production of whiskers prepared by this method is not high, so industrialization Mass production is limited
The whiskers prepared by the sol-gel method have good morphology, good dispersion, relatively uniform, and relatively low cost, but the synthesis steps are many and the synthesis cycle is relatively long, which is not conducive to industrial production
The advantage of the carbothermal reduction method using oxides as raw materials is that the process is relatively simple, the raw materials can be selected from a variety of options, and the cost is low. It is the main preparation process for industrial production, but the disadvantage is that it reacts at high temperature and the whisker yield needs to be improved.

Method used

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  • A kind of nano-VC whisker and preparation method thereof
  • A kind of nano-VC whisker and preparation method thereof
  • A kind of nano-VC whisker and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The preparation method of the nano VC whisker of the present embodiment comprises:

[0038] (1) Sodium metavanadate, xylose, potassium fluoride and sodium fluoride are dissolved in deionized water to obtain a precursor solution; wherein, the sodium metavanadate and xylose are according to carbon: the molar ratio of vanadium atoms is The ratio of 3:1 is added, the addition of the potassium fluoride is 100wt% of the theoretical production amount of vanadium carbide, and the addition of the ferric chloride is 25wt% of the theoretical production amount of VC;

[0039] (2) Place the precursor solution in an air blast drying oven, dry it at 75°C, grind it, pass it through a 300-mesh sieve, and take the undersize as the precursor mixture;

[0040] (3) Calcining the precursor mixture in an inert atmosphere at a temperature of 350° C. for 2 hours to obtain a pre-calcined product, which is cooled for later use;

[0041] (4) Precalcining the precalcined product in an inert atmosp...

Embodiment 2

[0044] The preparation method of the nano VC whisker of the present embodiment comprises:

[0045] (1) Ammonium metavanadate, glucose, sodium fluoride, nickel chloride and cobalt chloride (catalyst mass ratio 1:1) are dissolved in deionized water to obtain a precursor solution; wherein, the ammonium metavanadate Glucose is added according to the ratio of carbon: vanadium atom molar ratio is 5: 1, the addition amount of described sodium fluoride is 200wt% of the theoretical production amount of vanadium carbide, the total addition amount of described nickel chloride and cobalt chloride is VC theory 70wt% of the generated amount;

[0046] (2) Place the precursor solution in a blast drying oven, dry it at 85°C, grind it, pass it through a 350-mesh sieve, and take the undersize as the precursor mixture;

[0047] (3) Calcining the precursor mixture in an inert atmosphere at a temperature of 600° C. for 1 h to obtain a pre-calcined product, which is cooled and used for later use; ...

Embodiment 3

[0051] The preparation method of the nano VC whisker of the present embodiment comprises:

[0052] (1) Ammonium metavanadate, xylose, sodium fluoride and nickel chloride are dissolved in deionized water to obtain a precursor solution; wherein, the ammonium metavanadate and xylose are according to carbon: the molar ratio of vanadium atoms is The ratio of 4:1 is added, the addition of the sodium fluoride is 150wt% of the theoretical production amount of vanadium carbide, and the addition of the nickel chloride is 50wt% of the theoretical production amount of VC;

[0053] (2) Place the precursor solution in a blast drying oven, dry it at 80° C., grind it, pass it through a 300-mesh sieve, and take the undersize as the precursor mixture;

[0054] (3) Calcining the precursor mixture in an inert atmosphere at a temperature of 400° C. for 1.5 hours to obtain a pre-calcined product, which is cooled for later use;

[0055] (4) Precalcining the precalcined product in an inert atmospher...

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Abstract

The invention discloses nano VC (Vanadium Carbide) crystal whiskers and a preparation method thereof and belongs to the technical field of preparation of crystal whiskers. The preparation method comprises the following steps: dissolving soluble raw materials into a proper amount of de-ionized water to obtain a precursor solution; then drying and grinding to obtain a mixture; then carrying out pre-calcination on the precursor mixture in reaction equipment; after carrying out the calcination, carrying out final carbon thermal reduction to obtain a crystal whisker product; finally, purifying thecrystal whisker product to obtain the nano VC crystal whiskers. The method disclosed by the invention has a simple technology; raw materials including a carbon reducing agent and fused salt have an abundant source and a low price, and different component raw materials do not need to be mechanically mixed; the preparation method is convenient to operate and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of whisker preparation, in particular to a nano-VC whisker and a preparation method thereof. Background technique [0002] Vanadium carbide (VC) is a material commonly used in metallurgy and chemical industries, with a face-centered cubic NaCl crystal structure and a lattice constant of a=0.4165nm. VC has high hardness, high melting point and excellent high temperature strength. It is usually added to steel to improve the comprehensive properties of steel such as wear resistance, corrosion resistance, toughness, strength, ductility, hardness and thermal fatigue resistance, and to make steel It has good weldability, and can play the role of eliminating the extension of inclusions. VC can be used as an inhibitor of ultra-fine cemented carbide grains. Adding a small amount of VC can significantly improve the hardness and fracture toughness of the matrix alloy, and prevent the growth of WC grains in the cemente...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/62C30B29/36C30B7/14
CPCC30B7/14C30B29/36C30B29/62
Inventor 金永中蒋小朗房勇林修洲杨瑞嵩周锐
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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