Cu-Ni-Sn-S合金の機械的特性評価

～熱処理及び表面制御による影響～

抄録

In this research，we are considering the development of new materials to further improve the performance of materials for connecting rod bearings．The material currently under consideration is a Cu-Ni-Sn alloy．This alloy is excellent in wear resistance，corrosion resistance，and hardness by precipitation．However，the wear resistance when sliding under high load is insufficient．Therefore，Cu-Ni-Sn-S alloys with sulfur，which can be expected as a solid lubricant，are drawing attention．The purpose of this study is to investigate the hardness of Cu-Ni-Sn-S alloy during heat treatment and to investigate the effect of sulfur addition on the surface structure and hardness．As a result，a sufficient hardness of 305.2 HV was obtained after 30-hour aging．Also，segregation of Sn，Ni，and P was observed near the sulfide，which is considered to be due to the addition of sulfur．Based on the sizes of Sn，Ni，and P，it is considered that the effect of adding sulfur on hardness is extremely small．