Tantalum Carbide Particles

The density is 14.3g/cm3. Insoluble in water, insoluble in inorganic acid, soluble in mixed acid of hydrofluoric acid and nitric acid, and decomposable. Strong antioxidant ability, easy to be melted and decomposed by potassium pyrosulfate. High conductivity, the resistance of 30Ω at room temperature, showing superconductivity. Used in powder metallurgy, cutting tools, fine ceramics, chemical vapor deposition, cemented wear-resistant alloy tools, tools, molds, wear-resistant, and corrosion-resistant structural parts additives, improve the toughness of alloys. The sintered body of tantalum carbide shows golden yellow and can be used as a watch decoration.

Tantalum carbide particles have the advantages of high strength, high hardness, and good wetting with the matrix, making them widely used in aerospace, metallurgy, building materials, electric power, hydropower, mining, and other fields as second-phase particle-reinforced metal matrix composites, and have achieved good practical application results. The reported carbide particles mainly include tungsten carbide (WC), titanium carbide (TiC), niobium carbide (NbC), and vanadium carbide (VCp), while tantalum, the element of the same family of vanadium metal and niobium, is less studied.

Tantalum carbide (TaC) particles have the advantages of high melting point (3880 °C), high hardness (2100HV0.05), good chemical stability, strong electrical and thermal conductivity, etc., but due to their cost and other issues, the reports are limited to nickel-based, aluminum-based, and other substrates. Chao et al. used laser cladding technology to prepare nickel-based reinforced tantalum carbide surface composites, and the results showed that the hardness of this material was significantly higher than that of pure nickel, and the wear rate was significantly lower than that of hardened steel. Yu et al. studied the relationship between the directional solidification of nickel-based, chromium-based, and aluminum-based reinforced tantalum carbide in situ and its microstructure under high-temperature gradients, and the results showed that with the increase of solidification rate, the solid phase structure changed, and the volume fraction of tantalum carbide also changed with the change of solidification rate. Wang Wenli et al. used laser cladding technology to prepare an in-situ TaC particle-reinforced nickel-based composite coating on the surface of A3 steel, and the results showed that under appropriate process conditions, the TaC particle-reinforced nickel-based composite coating was well formed, the surface was smooth, and the coating and the matrix showed good metallurgical bonding. However, the study of the in situ generations of TaC by steel bases has rarely been reported. Therefore, the method of the surface ceramic particle-enhanced iron-based composite was used in this experiment. At the same time, TaC particles were selected as the second phase particle reinforcement phase. The micromorphology and reaction process of TaC particles reinforced in situ reinforced iron matrix composites were analyzed.

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