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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  • 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

Method used

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

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Example Embodiment

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

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

[0053] Among them, ammonium metavanadate is NH 4 VO 3 In terms of titanium dioxide, TiO 2 In total, 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 such that the amount of TiC and VC produced by the reaction is 0.8 to 0.85 times 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 Need to add 2.8~3 moles of C; 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 1.5-2.5...

Example Embodiment

[0101] Example 1 Production of high-purity vanadium-titanium carbide by the method of the present invention

[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 briquetting. Put the briquette into a 50 ml alumina ceramic crucible, fill the remaining space in the porcelain crucible with 9.0 g of high-purity carbon powder, and cover the top of the briquette with 9 mm 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. Then put the loaded crucible into the muffle furnace for a carbonization (schematic diagram as shown in Fig. Figure 5 shown), kept at 650°C for 3h, and then kept at 922°C for 122min. After the heat preservation, the samples were taken out after being cooled to...

Example Embodiment

[0103] Example 2 Production of high-purity vanadium-titanium carbide by the method of the present invention

[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 briquetting. Put the briquette into a 500ml alumina 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. Then put the loaded crucible into the muffle furnace for a carbonization (schematic diagram as shown in Fig. Figure 5 shown), kept at 650°C for 3h, and then kept at 922°C for 122min. After the heat preservation, the samples were taken out after being cooled...

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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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