Mechanical properties and microstructure of Al2O3/Ti(C,N)/CaF2@Al2O3 self-lubricating ceramic tool.

Abstract Due to the poor mechanical properties of solid lubricants, direct addition to the ceramic matrix will reduce the mechanical properties of the material. In this study, Al(OH) 3 was coated on the surface of nano CaF 2 by non-uniform nucleation method and added to Al 2 O 3 /Ti(C,N) ceramic matrix. Al 2 O 3 /Ti(C,N)/CaF 2 @Al 2 O 3 was prepared by vacuum hot pressing sintering. Compared with the material directly added with nano-solid lubricant, the mechanical properties of ceramic tools added with coated nano-solid lubricant have been significantly improved. Among them, when the content of coated nano-solid lubricant is 10 vol%, the ceramic material has better comprehensive mechanical properties. SEM observation shows that the cross-sectional particle distribution of nano-coated powder ceramic material is relatively uniform and has good compactness. The fracture mode of ceramic materials is a mixed fracture mode of intergranular fracture and transgranular fracture. Highlights • Al 2 O 3 was coated on the surface of nano CaF 2 by non-uniform nucleation method. • The mechanical properties of ceramic tools coated with nano-solid lubricants were significantly improved. • The microstructure of ceramic materials with coated nano-powders was studied. [ABSTRACT FROM AUTHOR]