Method for preparing titanium carbide nanometer particles and composite materials thereof by direct current arc method

Abstract

A method for preparing titanium carbide nanometer particles and composite materials thereof by a direct current arc method belongs to the field of nanometer material preparation technology and application. The method is characterized by including steps of using automatically controlled direct-current arc plasma equipment; utilizing a bulk metal titanium raw material as an anode and a graphite bar as a cathode; leading in mixed gases including carbonic reaction gas, inert gas and active gas which are in certain proportion; and obtaining the titanium carbide nanometer particles and the composite materials thereof after evaporating the bulk metal raw material. The method has the advantages that a preparation process is simple, the kind of nanometer powder materials can be produced on a large scale, size distribution is uniform, purity is high, and accordingly the method can be applied to the fields of electrochemical electrodes and wear-resistant coating materials.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation. It is a process for preparing titanium carbide nanoparticles and its composite materials by using DC arc plasma evaporation method. Background technique [0002] Titanium carbide ceramic powder has many excellent properties, such as high melting point, high hardness, wear resistance, corrosion and oxidation resistance, high electrical conductivity and thermal conductivity, etc. It is mainly used in tool materials, aerospace materials, electrode materials, etc. [0003] The main preparation methods of titanium carbide are: carbothermal reduction method, that is, carbon black or carbon-containing organic matter and TiO 2 The powder is reacted at a high temperature exceeding 1500 ° C. The reaction time is long, and the particle size distribution of the obtained product is wide, which requires further processing. This method was used in the initial industrial production; the d...

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Problems solved by technology

[0003] The main preparation methods of titanium carbide are: carbothermal reduction method, that is, carbon black or carbon-containing organic matter and TiO 2 The powder is reacted at a high temperature exceeding 1500 ° C. The reaction time is long, and the particle size distribution of the obtained product is wide, which requires further processing. This method was used in the initial industrial production; the direct carbonization method, that is, the use of titanium powder and graphite powder Direct reaction, including high-temperature self-propagating method and mechanical ball milling method, the reaction process of these two methods is difficult to control, the reaction is very fast and the product yield is very limited; chemical vapor deposition method, generally using TiCl 4 as starting material, but the yield of this reaction is very low and the quality will be limited

The above method is a common method for industrial production of titanium carbide powder materials, but there are shortcomings of impure products or uneven particle size distribution.

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