Effects of solid lubricant content on the microstructure and properties of NiCr/Cr3C2–BaF2·CaF2 composite coatings

Thermally sprayed Cr₃C₂–NiCr cermet coatings have been widely used for high temperature wear resistance and corrosion resistance applications in various industrial applications such as power generation industry, gas turbines, oil and steel industries,etc. However, the counter materials sliding against Cr₃C₂–NiCr coatings exhibit significantly high wear rates dueto the high sliding coefficient of friction and high hardness of Cr₃C₂–NiCr coatings, which significantly limits the application on rotation devices and other places. In order to reduce the coefficient of friction and improve the tribological properties of this kind of wear-resistant hard coatings, soft noble metals (Au, Ag etc), inorganic fluorides (LiF₂, CaF₂, etc) and some metal oxides (NiO, MoO₃, Cr₂O₃, etc) have been employed as solid lubricants in numerous studies. It has been found that BaF₂/CaF₂ eutectic can significantly improve the tribological properties of wear-resistant hard coatings because of its lower melting point and shear strength as compared to a single fluoride, and it has been extensively used as a solid lubricant at elevated temperatures. Using the chemical-coated method and alloying process,BaF₂·CaF₂ eutectic and Cr₃C₂ powders cladded with NiCr alloy

were prepared. The resulting NiCr/Cr₃C₂ and NiCr/BaF₂·CaF₂ particles were then used as a hard wear-resistant phase and high temperature solid lubricant to prepare NiCr/Cr₃C₂–BaF₂·CaF₂ self-lubrication wear-resistant coatings by plasma spray.

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