Abstract:
In combination with the national strategic deployment of the 14th Five-Year Plan, based on the enterprise resource background and the downstream market demand, this paper proposes to prepare spherical titanium carbide (TiC) nanopowder through the short process of molten salt method. The process does not use flammable and explosive reducing agent, and has high safety factor. The process produces products with high quality, controllable output, short production cycle and environmental protection, which has certain industrial popularization. The selection and proportion of titanium source and carbon source, the proportion of molten salt, the calcination temperature of nanoparticles, and the effect of holding time on the morphology and quality of nanoparticles were studied. The phase composition and microstructure of the particles were characterized by XRD and SEM. The results show that when the molar ratio of NaCl-KCl mixed salt is 1∶1, the reactants in the ratio of Ti/C molar ratio of 1∶1, and TiC begins to form when the temperature is kept at 700 ℃ for 2 h. With the increase of temperature, the purity of the target product in the product gradually increases. The temperature of holding at 900 ℃ for 2 h can obtain the pure target product, without the formation of other by-products. The morphology is spherical, and the particle size is about 80 nm. If the holding time is changed, when the holding time is 5 h, the pure target product can be obtained at 850 ℃, but the particle size will be moderately increased to 100 nm. From the perspective of reducing raw material costs, when the titanium source ratio is Ti∶TiO2=9∶1, impurity free titanium carbide nanoparticles can be obtained at 900 ℃, with spherical morphology and particle size ranging from 50 to 65 nm.
