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Preparation method of vanadium titanium carbide

A technology of vanadium carbide titanium and carbon powder is applied in the field of metal ceramics, which can solve the problems of high raw material cost, poor crystallinity and high energy consumption, and achieve the effects of simple process, reduced production cost and low energy consumption

Active Publication Date: 2014-11-05
临泉县非凡装饰工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there is also the problem of high energy consumption due to the consumption of a large amount of energy for melting molten steel and casting in the later stage.
Therefore, the method described in document 2 still has the disadvantages of high raw material cost and high energy consumption
[0009] Document 3 is: using ammonium metavanadate powder, metal titanium powder and carbon powder as raw materials to prepare vanadium-titanium carbide, but the obtained vanadium-titanium carbide has poor crystallinity and free carbon

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  • Preparation method of vanadium titanium carbide
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  • Preparation method of vanadium titanium carbide

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preparation example Construction

[0051] The preparation method of vanadium-titanium carbide of the present invention can specifically be divided into three kinds, method one, comprises the steps:

[0052] a. Ingredients: mix ammonium metavanadate, titanium dioxide, and carbon powder to obtain a mixture;

[0053] Among them, ammonium metavanadate is represented by NH 4 VO 3 In terms of titanium dioxide as TiO 2 In terms, the molar ratio is NH 4 VO 3 :TiO 2 =1:9~9:1, the carbon powder is based on the C content, and the carbon content is 0.8~0.85 times of the theoretical value, that is, 1 mole of TiO 2 Need to add 2.4-2.55 moles of C, 1 mole of NH 4 VO 3 2.8-3 moles of C need to be added; the reaction formula is:

[0054] TiO 2 +3C=TiC+2CO;

[0055] 2NH 4 VO 3 =V 2 o 5 +2NH 3 +H 2 O;

[0056] V 2 o 5 +7C=2VC+5CO;

[0057] b. Press molding: the mixture is pressed and formed to obtain a briquette, and the density of the briquette is 1.5-2.5g·cm -3 ;

[0058] c. Primary carbonization: put the ...

Embodiment 1

[0101] Embodiment 1 Adopt the method of the present invention to produce high-purity vanadium titanium carbide

[0102] Take ammonium metavanadate (NH 4 VO 3 =99.5%, particle size≤120μm) 11.25g, titanium dioxide (TiO 2 ≥99%, particle size ≤50μm) 7.5g, graphite powder (C≥99.85%, particle size≤30μm) 6.25g, mixed and pressed to a density of 2.18g cm -3 of briquetting. Put the briquette into a 50ml aluminum oxide porcelain crucible, fill the remaining space in the porcelain crucible with 9.0g of high-purity carbon powder, and cover the top of the briquette with 9mm of carbon black. Then put the porcelain crucible into a large silicon carbide crucible with a diameter of 160 mm and a depth of 120 mm, and cover it with coal powder. Put the loaded crucible into the muffle furnace for a carbonization (schematic diagram as shown in Fig. Figure 5 shown), at 650°C for 3h, then at 922°C for 122min. After the heat preservation is over, the sample is taken out with the furnace cooling...

Embodiment 2

[0103] Embodiment 2 Adopt the method of the present invention to produce high-purity vanadium titanium carbide

[0104] Take ammonium metavanadate (NH 4 VO 3 =99.5%, particle size≤120μm) 45.68g, titanium dioxide (TiO 2 ≥99%, particle size ≤50μm) 30.52g, graphite powder (C≥99.85%, particle size≤30μm) 23.8g, mixed and pressed to a density of 2.15g cm -3 of briquetting. Put the briquette into a 500ml aluminum oxide porcelain crucible, fill the remaining space in the porcelain crucible with 100g of high-purity carbon powder, and cover the top of the briquette with 10mm of carbon black. Then put the porcelain crucible into a large silicon carbide crucible with a diameter of 160 mm and a depth of 120 mm, and cover it with coal powder. Put the loaded crucible into the muffle furnace for a carbonization (schematic diagram as shown in Fig. Figure 5 shown), at 650°C for 3h, then at 922°C for 122min. After the heat preservation is over, cool the sample to room temperature with the...

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Abstract

The invention relates to a preparation method of vanadium titanium carbide, belongs to the field of metal ceramic, and aims to solve the technical problem by providing the preparation method of vanadium titanium carbide. The preparation method of vanadium titanium carbide comprises the following steps: a, preparing materials: mixing evenly ammonium metavanadate, titanium dioxide and carbon powder to obtain a mixed material; b, pressing for forming: pressing for forming the mixed material to obtain a pressure block with density of 1.5-2.5 g / cm<3>; c, a first carbonation: conducting carbonization on the pressing block, and removing ammonium and crystallized water of in the mixed material, insulating and cooling; d, secondary carbonation: brushing off carbon powder on the surface of the pressing block, grinding, sieving, conducting ball milling treatment and pressing for forming to obtain pressing block with density of 1.5-2.5 g / cm<3>; and then insulating in a vacuum atmosphere at 1500-1800 DEG C for 1-3 h, and cooling to obtain the vanadium titanium carbide. The vanadium titanium carbide prepared by the preparation method has good crystallinity, and the preparation method is simple and low in energy consumption.

Description

technical field [0001] The invention relates to a method for preparing vanadium-titanium carbide, which belongs to the field of cermets. Background technique [0002] Vanadium-titanium carbide ((Ti, V)C) is a new type of cemented carbide that has emerged in recent years. It is a continuous solid solution formed by TiC and VC. Due to its low density, this new type of cemented carbide is expected to replace traditional WC-based cemented carbide in wear-resistant parts, cutting tools, abrasive tools, etc., which is conducive to saving my country's precious tungsten and cobalt resources. [0003] At present, the methods for preparing (Ti, V)C include stirring casting method and metal titanium carbide method. [0004] Such as document 1: the disclosed stirring casting method of the patent application whose publication number is CN103273042A is: take titanium powder, vanadium iron powder, graphite, reduced iron powder as raw material, through grinding, vacuum drying, add polyethy...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622
Inventor 陈敏许子路方民宪张雪峰金佳舟陈诚
Owner 临泉县非凡装饰工程有限公司
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