Vanadium carbide powder

Other name: Vanadium carbide (VC); methane – vanadium (1:1); methylidynevanadium; Vanadium monocarbide
CAS no. : 12070-10-9; 11130-21-5
EINECS no. : 235-235-5
Molecular formula: CHV.
Molecular weight: 63.9601
Density: 5.77g / cm3
Melting point: 2810 ° C
Boiling point: 3900 ℃

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The basic characteristics of vanadium carbide powder:
Vanadium carbide, a metallurgical and chemical industry commonly used materials, the formula for the VC, for the face-centered cubic NaCl crystal structure, the lattice constant a = 0.4165 nm. The main components are C and V, in addition to a small amount of Mo, Ni, Fe and so on. In accordance with the chemical composition of vanadium carbide requirements, the carbonization rate should reach 99%, allowing a small amount of impurities exist.
Due to its special properties, vanadium carbide has been widely used in metallurgy, electronics, catalysts and other fields. Vanadium carbide can be used in structural steel, tool steel, pipe steel, steel, general engineering and cast iron. The existing research shows that the addition of vanadium carbide to steel can improve the comprehensive mechanical properties such as wear resistance, corrosion resistance, toughness, strength, ductility and hardness as well as thermal fatigue resistance, and make the steel weldable Performance, but also play an active role in eliminating inclusions.
Vanadium carbide can be used as grain carbide ultra-fine carbide inhibitor, adding a trace amount of VC can significantly improve the hardness and fracture toughness of the matrix alloy to prevent the growth of WC grains in cemented carbide; addition of vanadium carbide carbide carbide can also make life Increase by 20%.
Vanadium carbide in high temperature coatings, as well as carbon source of synthetic diamond and other industries have also been widely used.

Vanadium carbide is a non-stoichiometric compound, with face-centered cubic structure, as an important alloy additive, has been widely used in steel and hard alloy. The specific application of vanadium carbide is as follows:
2.1 vanadium carbide as a grain growth inhibitor, in the preparation of ultrafine cemented carbide has been widely used. The mechanism of action is as follows: the grains grow mainly in the process of dissolution and precipitation of WC, the WC dissolves in the liquid phase and precipitates on the larger WC crystal, and the inhibitor changes the WC-Co interface free energy, thus restricting Dissolution - precipitation process, reducing the dissolution - precipitation rate, the process of grain growth slows down.
According to statistics, adding VC can make carbide life expectancy increased by 20%, but its mechanism of action is unclear. Because ultra-fine VC has high activity and atom migration speed, it is more conducive to particle diffusion and dissolves more easily in the cobalt phase, thus effectively preventing the dissolution-precipitation of tungsten carbide. Therefore, ultrafine VC is of great significance to the development of ultrafine cemented carbide.
2.2 vanadium carbide for WC-Ni cemented carbide, in which a small amount of vanadium carbide can effectively reduce the Curie point of the alloy, the alloy at room temperature from ferromagnetic to paramagnetic. Adding VC can make the saturation magnetization, remanence, coercivity, energy product, magnetic permeability and Curie temperature of WC-10% Ni cemented carbide decrease to produce non-magnetic alloy. Its mechanism is as follows: the solid solution of VC in the binder phase increases the atomic distance a of the Ni lattice so that the ratio of a to the radius r of the unfilled electron layer of Ni increases, Change to non-magnetic.
2.3 Solid solutions of vanadium carbide and other metal carbides used as a matrix or additive in the production of tungsten-free cemented carbides. If appropriate amount of added vanadium carbide can TiB2-Fe-Mo cemented carbide wear resistance, high temperature strength and high temperature oxidation resistance is improved.
2.4 Vanadium carbide can be used as an effective catalyst, because of its high activity, selectivity, stability and resistance to "poisoning" catalyst in the hydrocarbon reaction capacity, as a new type of catalyst has been widely used. Such as NH3 synthesis.
2.5 High vanadium high-speed steel with excellent wear resistance and safety of the main reasons is that by increasing the content of vanadium which forms a high-hardness vanadium carbide. High-vanadium high-speed steel, a new type of steel, is used in the new direction of wear-resistant materials. Its life is 3 times higher than that of high-chromium cast iron and 10 times that of high-manganese steel.
2.6 vanadium carbide with good morphology (to the substrate less fragmentation) and high hardness (vanadium carbide hardness can reach HV2600), can make high-vanadium iron carbon alloy showed excellent wear resistance.
2.7 abroad recently developed a thin layer of vanadium carbide, metallurgically bonded to the tool surface of the new method, with this tool processing parts efficiency can be increased several times, or even dozens of times. This method is the tool steel tool placed in the borate bath containing carbide elements, the vanadium can diffuse into the tool steel substrate, and with the carbon compound. Commonly used substrate materials for Cr5MoLV and Cr12MoV alloy tool steel. The hardness of this coating is high 3200 ~ 3800HV, and not easy to peel off, the coating thickness (0.014 ~ 0.0125mm) of 20% penetration into the tool surface, thus enabling tool life greatly increased.

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