FRICTION REDUCING MECHANISMS OF Al2O3/TiC/CaF2 SELF-LUBRICATING CERAMIC TOOLS IN MACHINING PROCESSES

Abstract

Abstract: CaF2 solid lubricants are added to Al2O3/TiC ceramic tool matrix to improve its tribological behaviors. Al2O3/TiC/CaF2 self-lubricating ceramic tools are produced successfully. Dry cutting tests are carried out on 45 steel with this kind of ceramic tool. Results show that the friction coefficient between the tool-chip interface of Al2O3/TiC/CaF2 self-lubric- ating ceramic tool is greatly decreased compared with that of common Al2O3/TiC ceramic tool. A self-lubricating film, which can be acted to reduce the friction coefficient and adhesion, is formed between the tool-chip interface during machining processes for Al2O3/TiC/CaF2 self-lubricating ceramic tool. Microstructure analysis of the wear surface show the self-lubri- cating film on the tool rake face experiences a four stage cycle, ie. Forming, fracture, falling off and re-forming, Therefore, this kind of ceramic tool has self-lubricating behaviours during its full lifetime.

Key words: Machining, Self-lubrication Friction and wear, Tool material

CLC Number:

TQ174

DENG Jianxin;CAO Tongkun;AI Xing. FRICTION REDUCING MECHANISMS OF Al2O3/TiC/CaF2 SELF-LUBRICATING CERAMIC TOOLS IN MACHINING PROCESSES[J]. , 2006, 42(7): 109-113.

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FRICTION REDUCING MECHANISMS OF Al2O3/TiC/CaF2 SELF-LUBRICATING CERAMIC TOOLS IN MACHINING PROCESSES

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