高シリコン含有アルミニウム合金の摩擦摩耗特性に及ぼす各種潤滑油添加剤の影響

抄録

High silicon content aluminum alloys are used in machine parts which need weight saving and wear resistance. The application of aluminum alloys in automotive engines is being undertaken. On the other hand, zinc dialkyldithiophosphate (ZnDTP) has been the most widely used lubricant additives in the engine, but it is known that ZnDTP can easily cause sludge and catalyst poisoning. Therefore the development of alternative additives has proceeded. In this study, friction and wear properties of the high silicon content aluminum alloys and CrN (chromium nitride) are investigated by using a block-on-ring type sliding tester in lubricating oils with ZnDTP or sulfur containing anti-wear agents. As a result, the friction coefficient in the case of ZnDTP was higher than that of non-additive. And the friction coefficient in the case of sulfur containing anti-wear agents were lower than that of non-additive. Both ZnDTP and sulfur containing anti-wear agents improved wear resistance. Tribofilms formed by the additive in the wear track affected the friction and wear properties.