Metal matrix composites have received extensive attention from scientists in the field of materials of various countries due to their unique advantages of high specific strength, high specific modulus, wear resistance and high temperature resistance. At present, the research on metal matrix composite materials is mainly focused on the overall uniform composite, but because the wear only occurs on the surface of the part, the overall composite is not conducive to the recovery and reuse of the material and causes pollution to the environment. On the other hand, many studies have shown that wear-resistant materials need to have both high hardness and high toughness, while the overall composite only improves the hardness, but cannot improve the toughness, while the metal-ceramic composite material maintains the high hardness and high toughness of ceramics. Excellent performance such as wear resistance, and high toughness and high ductility of the metal matrix.
Carbide particles have the advantages of high strength, high hardness, and good wettability with the matrix. As a second phase particle reinforced metal matrix composite material, it has been widely used in aerospace, metallurgy, building materials, electric power, hydropower, mining and other fields. And achieved very good practical application effects. The carbide particles currently reported mainly include tungsten carbide (WC), titanium carbide (TiC), niobium carbide (NbC) and vanadium carbide (VCp), while the same group of elements as vanadium and niobium, tantalum, has not been studied.
Tantalum carbide (TaC) ceramic particles have the advantages of high melting point (3880℃), high hardness (2100HV0.05), good chemical stability, and strong electrical and thermal conductivity. However, due to their cost and other issues, the current reports are limited to nickel-based , Aluminum-based and other substrates. Chao et al. used laser cladding technology to prepare a nickel-based reinforced tantalum carbide surface composite material. The results show that compared with pure nickel, the hardness of this material is significantly improved, and the wear rate is significantly lower than that of hardened steel; Yu et al. The relationship between the in-situ reaction and directional solidification of tantalum carbide and its microstructure with chromium-based, chromium-based, and aluminum-based reinforcement. Change; Wang Wenli and others used laser cladding technology to prepare in-situ TaC particle-reinforced nickel-based composite coating on the surface of A3 steel. The results show that under appropriate process conditions, it generates TaC particle-reinforced nickel-based composite coating. Good, smooth surface, good metallurgical bonding between the coating and the substrate. However, there are few reports on the in-situ formation of TaC on the steel base. Therefore, the method of surface ceramic particles reinforced iron-based composite was used in this experiment. At the same time, TaC particles are selected as the second phase particle reinforcement phase. The microscopic morphology and reaction process of the iron-based surface composites reinforced with TaC particles in situ were analyzed.
