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- W3170259054 abstract "• The surface of CaF 2 nanoparticles was coated with a layer of SiO 2 by heterogeneous nucleation method. • The influence of various process parameters on the morphology of coated particles was determined. • The formation process of SiO 2 -coated CaF 2 nanoparticles and the surface coating modification mechanism were analyzed. The microstructure of materials is the basic factor affecting their properties. In order to reduce the influence of adding solid lubricant on the performance of ceramic cutting tools, a new preparation method was adopted to prepare CaF 2 @SiO 2 solid lubricant. Firstly, uniformly dispersed CaF 2 nanoparticles were obtained by precipitation and azeotropic distillation, and then SiO 2 was coated on the surface of CaF 2 by using the hydrolytic condensation effect and heterogeneous nucleation effect of TEOS, so as to prepare CaF 2 @SiO 2 solid lubricant with core-shell structure. The effects of process parameters on the microstructure and surface morphology of coated nanoparticles were analyzed. The results show that TEOS titration speed, pH value, temperature and azeotropic distillation have great influence on the quality of nano-silica powder. The optimum preparation parameters are: pH 8.5, TEOS dropping rate 0.4 mL/min, reaction temperature 40 °C and azeotropic distillation. The formation process and surface coating modification mechanism of CaF 2 @SiO 2 nanoparticles were analyzed. Owing to heterogeneous nucleation theory, SiO 2 can be adsorbed on the surface of CaF 2 stably, and the interaction between SiO 2 and CaF 2 can form a stable adsorption interface. And the driving force of nucleation changes with the process parameters. By changing different process parameters, the controllable preparation of coating can be realized, and the optimal thickness of coating is about 10 nanometers." @default.
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- W3170259054 date "2021-11-01" @default.
- W3170259054 modified "2023-09-25" @default.
- W3170259054 title "A new preparation method of CaF2@SiO2 nano solid lubricant and analysis of its coating mechanism" @default.
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- W3170259054 doi "https://doi.org/10.1016/j.jallcom.2021.160795" @default.
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