Preparation method and process of vanadium carbide powder
Release time:
2022-10-24 10:23
Source:
Because vanadium carbide has the general characteristics of transition metal carbide such as high hardness, melting point and high temperature strength, as well as good electrical conductivity and thermal conductivity, it is widely used in iron and steel metallurgy, cemented carbide, electronic products, catalysts and high temperature coating materials. Then, let's learn about the preparation method and process of vanadium carbide powder!
Vanadium carbide can improve the wear resistance, corrosion resistance, toughness, strength, ductility and heat fatigue resistance of steel, prevent the growth of cemented carbide grains during sintering, and improve the mechanical properties of cemented carbide and cermet. At the same time, it can be used as a wear-resistant material for different cutting and wear-resistant tools. Due to its high activity, selectivity, stability and the ability to resist "catalyst poisoning" in hydrocarbon reactions, vanadium carbide can also be used as a separate application in the field of cemented carbide and cermet. With the increasing use of cemented carbide in high-tech weapons and equipment, science and technology and nuclear energy, vanadium carbide has also been widely used as a new type of catalyst, and the preparation and market demand of ultrafine vanadium carbide powder are becoming more and more urgent.
Dissolve powder ammonium vanadate, carbonaceous reducing agent and catalyst in deionized water or distilled water according to a certain ratio, volatilize, concentrate and decompose the solution prepared according to a certain ratio to obtain precursor powder, react for a certain time in the temperature range of 700-1300 to obtain vanadium carbide powder with good dispersion and particle size less than 50nm, and heat and dry to obtain precursor powder containing vanadium and carbon, under certain temperature and atmosphere conditions, vanadium carbide powder with average particle size less than 100nm and uniform particle size distribution is obtained by carbonization in a high-temperature reaction furnace. Under certain conditions, the nano-vanadium carbide powder with uniform chemical composition, uniform shape and size and high stability is obtained by heat preservation reaction in a tube furnace. It has the characteristics of simple process, low cost and easy industrialization. After mixing and grinding the carbon source and ammonium metavanadate according to a certain proportion, it has the advantages of simple process and short reaction cycle.
The preparation process of vanadium carbide is mainly carbothermal reduction, gas phase reduction method, precursor method, etc. Among them, the preparation process of nano vanadium carbide powder is mainly prepared by precursor method. The precursor law has problems in quality control of headlamp products, such as long process flow, particle size of precursor powder, difficult control of sintering temperature and sintering time, large proportion of non-stoichiometric components, and powder particle size distribution range, different vanadium sources and carbon sources are mixed and dissolved in liquid carriers, heated and dried, etc. However, high purity and fine particle size vanadium carbide powder cannot be obtained by carbon thermal reduction and gas phase reduction.
The production method of vanadium carbide powder includes the following processes:
a. Chlorination of vanadium carbide-containing powder: using vanadium-containing powder as vanadium source, boiling chlorination is carried out to obtain the primary product of vanadium chloride;
B, vanadium carbide primary product refining: collect the distillate from 160~180 distillation to obtain high-purity vanadium chloride intermediate product; Distillate the vanadium chloride primary product in 110~140 and 160~180 respectively.
c. high-temperature carbonization of vanadium carbide: in contact with the reaction carrier, carbonization reaction occurs to obtain high-purity ultrafine metal vanadium powder, and the intermediate product of vanadium chloride is heated and gasified and mixed with high-purity ch4 and h2 mixed gas.
The above introduction is the preparation method and process of vanadium carbide powder. If you need to know more, please feel free to contact us!
Vanadium carbide
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