Study on structure and performance of PCBN super-hard tool materials for car gear parts
PCBN(polycrystalline cubic boron nitride)superhard tool materials were synthesised under high tem-perature and high pressure conditions using CBN/Ti/Al as raw materials.The effects of the synthesis pressure on the flexural strength,wear resistance and interfacial morphology of the PCBN composites were investigated.The results show that the flexural strength and wear resistance of the PCBN composites increases as the synthesis pres-sure is increased.The bonding interface between the cemented carbide matrix and CBN is analysed by scanning electron microscopy.The test results show that increasing the synthesis pressure can improve the interfacial bond strength of the PCBN material,reduce the occurrence of delamination and cracks,and improve the yield of the syn-thesised product.Also,within the pressure range at 5.5-7 GPa,PCBN has better flatness,less CBN thickness differ-ence and higher product utilisation in cutting.The performance of the synthesised tool material at 7 GPa is relative-ly close to that of Sumitomo BN700 in machining gear parts,with good market prospects.
high pressurepolycrystalline cubic boron nitrideinterfacial bondingcuttingcar gear part
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