Al₂O₃/TiC/SiCウイスカ系工具におけるSiとFeとの反応

抄録

The Al₂O₃/TiC/SiC whisker tools are fabricated with a view to improve mechanical properties, such as bending strength, hardness and fracture toughness of Al₂O₃/TiC composites. But, it has been said that the wear of the SiC whisker content ceramic tool results from the reaction between Si in tools and Fe in work materials in the case of steel cutting. This paper presents the reaction between Si and Fe, and the cutting performance of the Al₂O₃/TiC/SiC whisker tool. Then the reaction between crushed Al₂O₃/TiC/SiC whisker tool and carbonyl iron powder is analyzed by DTA and EPMA. The result of the DTA analysis is that the exothermic peak appears at 1160°C as the diffusion of Si into Fe. And the results are obtained by the cutting test with wear resisting copper cast alloy, the wear of Al₂O₃/TiC/SiC whisker tool decreases with the increasing SiC whisker contents. On the other hand, it is found that in cutting of S45C and FCD500-7, the tool wear of Al₂O₃/TiC/SiC whisker tool increases with the increasing SiC whisker contents. And the wear mechanism of Al₂O₃/TiC/SiC whisker tool has been discussed.