| 摘要 |
<p>In an aspect of the present invention, a synchronizer ring, made of Fe-based sintered alloy, having an internal circumferential surface 101, is provided, the internal circumferential surface 101 being adapted to detachably engage in synchronized sliding with a rotating counterpart member thereof. At least the internal circumferential surface 101 is applied with aqueous vapor treatment to form iron oxide film thereon. In another aspect of the present invention, the iron oxide film has surface roughness not less than 20 mu mRz but not more than 55 mu mRz. In a further aspect of the present invention, the iron oxide film has a surface roughness not less than 25 mu mRz but not more than 35 mu mRz. In another aspect of the present invention, the iron oxide film has a thickness not less than 0.05 mu m but not more than 5 mu m. In a further aspect of the present invention, the major component of the iron oxide film is Fe3O4. In a still further aspect of the present invention, at least the internal circumferential surface is applied with blasting treatment in addition to, and in combination with, the aqueous vapor treatment to form iron oxide film thereon.</p> |
