Abstract: Using nano-CaF₂ as a solid lubricant,three kind of nano-modified Al₂O₃/TiB₂/CaF₂ self-lubricating ceramic tools with different contents of CaF₂,ATF1,ATF5,ATF10,were prepared,and used in the 45 steel and 40Cr cutting tests.The influences on the relations between cutting temperatures and cutting powers,rake face friction factors,and cutting properties of different tools of CaF₂ contents and cutting temperature were studied,the morphology of tools’ flank wear and rake wear were observed by SEM,proving nano-modified self-lubricating ceramic tools have self-lubricating properties,and explaining the mechanism of tools’ self-lubricating.The results showed that the CaF₂ content and cutting temperature both have impacts on the self-lubricating properties of self-lubricating tool.In 45 steel cutting experiment,the cutting temperature was high,tools’ CaF₂ contents were inversely proportional to their total amount of material removalis,tools’ self-lubricating was not obvious.In 40Cr cutting tests,the cutting temperature was low,compared with that of ATF1,the friction factors of the rake face of the ATF5 and ATF10 cutting tools with higher CaF₂ contents were significantly decreased,ATF10 tool whose CaF₂ content of the highest had the highest total amount of material removal,showing an obvious self-lubricating property and best cutting property.

Key words: nano-CaF₂, self-lubricating ceramic tool, cutting test, self-lubricating property