| 摘要 |
PURPOSE:To obtain a lightweight cam shaft having excellent strength and wear resistance by joining a ceramic layer to the outer peripheral face of a cam part formed of an Al alloy material having a specific compsn. formed by uniformly dispersing Al2O3 and Al-Fe intermetallic compd. CONSTITUTION:The cam part 1 and shaft part 2 are integrally formed by using the Al alloy material which consists of 4-10wt.% Fe, 2-12% Zn, <=3% Ti, <=3% rare earth metal and the balance substantially Al and is uniformly dispersed with the fine fragments of the Al2O3 and <=2mum Al-Fe intermetallic compd. in the Al base. The ceramic layer 3 is then jointed to the outer peripheral face of the above-mentioned cam part 1. Since the above-mentioned Al-Fe intermetallic compd. is projected to said outer peripheral face, the secure joining is obtd. and the desired wear resistance is effectively assured. The composite Al alloy-ceramic cam shaft which has the excellent strength and wear resistance in combination and is light in weight is thereby obtd. |
