アルミナ―シリカ繊維／Al-Cu合金複合材料の摩耗特性に及ぼす繊維組成の影響

抄録

  Al₂O₃-SiO₂ fiber reinforced Al-Cu alloy composites were fabricated by the LPI process using Al₂O₃-SiO₂ fibers with different SiO₂ content. In FRMMC specimens, no significant degradation of the Al₂O₃-SiO₂ fibers was observed. This indicates that the difference of the SiO₂ content in Al₂O₃-SiO₂ fibers has no significant effect on the degradation of the fibers in FRMMCs fabricated by the LPI process. However, the results of Vickers hardness test on Al₂O₃-SiO₂ fibers in FRMMCs suggests that FRMMCs using Al₂O₃-SiO₂ fibers with high SiO₂ content will have high bonding strength of the interface, indicating that the bonding strength of the interface will be changed depending on the degree of interfacial reaction between the Al₂O₃-SiO₂ fibers and molten Al alloy. FRMMCs showed better wear resistance than matrix alloy. Furthermore, the wear resistance of the FRMMCs was improved with increasing the SiO₂ content in the applied Al₂O₃-SiO₂ fibers. Detailed observation of the wear surface showed that the wear behavior of FRMMCs was changed due to the difference of the bonding strength of the interface between the Al₂O₃-SiO₂ fibers and matrix alloy. These results indicate that the SiO₂ content in the Al₂O₃-SiO₂ fibers will affect not only the bonding strength of the interface but also the wear behavior of FRMMCs.