Abstract
Friction properties and microstructural changes of SUS440C implanted with ions of IVa group (Ti, Zr, Hf), Va group (V, Ta), VIa group (Cr, W), VIIIa group (Fe), IIIa group (Y) and Ib group (Ag) in the periodic table were investigated. Specimens implanted with Ti, Zr, Hf, V, Ta and Y showed a decrease in the friction coefficient during reciprocating sliding tests at a load of 0.245 N. At higher weight loads, the specimens implanted with Ti, Zr, Hf and Y showed low friction. In the specimens implanted with Ti, Zr, Hf, V and Ta ions (IVa and Va groups), C invasion in the surface layer was detected and amorphous phase formation was observed. In the Y implanted specimen, yttrium oxide film was formed on the surface. Low friction observed in the specimens implanted with the ions of IVa and Va groups was due to the existence of an amorphous phase. In the Y implanted specimen, yttrium oxide film which is considered to act as a lubricant film promoted the low friction.
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