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Preparation method of transition metal carbide material

A transition metal and carbide technology, applied in the field of preparation of transition metal carbide powder, coating, fiber and nanotubes, can solve the problems of high preparation cost, high conversion temperature, difficult purification, etc., and achieve controllable form and raw materials The effect of low cost and low synthesis temperature

Inactive Publication Date: 2006-03-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purity of the synthetic product is low and it is difficult to purify
[0016] To sum up, in the process of preparing carbide materials, there are some problems such as high preparation cost, difficult purification, high conversion temperature, limited yield or even quality improvement, or the need for high-purity, fine metal powder as raw material, or the shape of carbide is difficult to control and other defects

Method used

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preparation example Construction

[0023] The invention relates to a preparation method of a transition metal carbide material. The process is to place the carbon material in the crucible, and cover the alkali metal or alkaline earth metal chloride, fluoride, nitrate, sulfate or transition metal fluorate material as an auxiliary agent without mixing or mixing with the transition metal material. On the carbon material in the crucible, under the condition of argon atmosphere or isolated air, heat the crucible at a heating rate of 0.1-30°C / min to 600°C-1300°C, keep it warm for 0.1-200 hours, and then cool it to room temperature; After the salt crucible is boiled in water, the insoluble transition metal carbide or the transition metal carbide supported on the carbon material is taken out, washed with water and dried. In essence, the present invention uses different molten salts as auxiliary media to prepare related transition metal carbide (VC, ZrC, NbC, MoC, HfC, TaC, WC) powders, coatings, fibers and new techniqu...

Embodiment 1

[0026] The preparation of embodiment 1 TaC coating

[0027] (1) Cover the carbon block in the crucible after the auxiliary agent is mixed with transition metal material tantalum powder, the carbon block, auxiliary agent, and tantalum powder are respectively 1-20wt%, 50-85wt%, 1-35wt%; Sodium chloride and potassium fluorotantalate are 50-60wt% and 40-50wt% of their consumption respectively;

[0028] (2) Heating to 1100-1300°C at a heating rate of 0.5-5°C / min under an argon atmosphere, maintaining the temperature for 0.1-0.5 hours, and then cooling down to room temperature;

[0029] (3) Boil the molten salt crucible in water, dissolve and remove the metal salt therein, and take out the insoluble carbon block coated with tantalum carbide. Further desalination is carried out by washing with water, and after drying, a tantalum carbide coating with a thickness of 1-10 μm is formed on the surface of the carbon block.

Embodiment 2

[0030] The preparation of embodiment 2 ZrC fiber

[0031] (1) Cover the carbon fiber in the crucible after the auxiliary agent is mixed with transition metal material zirconium powder, the carbon fiber, auxiliary agent, and zirconium powder are respectively 10-25wt%, 40-75wt%, 5-35wt%; Agent sodium chloride, sodium sulfate are respectively 80~90wt%, 10~20wt% of its consumption;

[0032] (2) Heating to 700-900°C at a heating rate of 10-15°C / min under an argon atmosphere, maintaining the temperature for 180-200 hours, and then cooling down to room temperature;

[0033] (3) Boil the molten salt crucible in water, dissolve and remove the metal salt therein, and take out the insoluble carbon fiber coated with zirconium carbide. It is further desalted by water washing and dried.

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Abstract

A process for preparing the carbide of transition metal includes such steps as putting carbon in crucible, covering it by assistant and transition metal, heating to 600-1300 deg.C at 0.1-30 deg.C / min under protection of Ar gas or in vacuum, holding the temp for 0.1-200 hr, cooling, boiling the crucible in water, taking the carbide, water washing and drying.

Description

1. Technical field [0001] The invention belongs to a preparation method of a transition metal carbide material. In particular, it relates to a method for preparing transition metal carbide powder, coating, fiber and nanotube by using molten salt as an auxiliary agent. 2. Background technology [0002] Transition metal carbides are a class of mesenchymal compounds produced by embedding carbon atoms into transition metal lattices, which have the properties of covalent solids, ionic crystals, and transition metals. In general, transition metal carbide materials of Group IV-VI (except Cr) have high melting points (VC, 2830°C; ZrC, 3530°C; NbC, 3500°C; MoC, 2692°C; HfC, 3887°C; TaC, 3800°C ; WC, above 1600 ℃), high hardness (Mohs: 8 ~ 9), high wear resistance, high corrosion resistance, strong thermal shock resistance, good chemical stability, and strong thermal stability at high temperatures. Therefore, it can be used as a reinforcement for abrasives, cutting tools and metal m...

Claims

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Application Information

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IPC IPC(8): C01B31/30C01B31/34C01B32/949
Inventor 李轩科董志军袁观明
Owner WUHAN UNIV OF SCI & TECH
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