Nano-particles Fe, Cu and nano-diamond particles were dispersed into synthetic worm oil without oiliness ad-ditive and extreme-pressure additive. The tribological behaviors were investigated by MM-200 wear test equipment, and the worn surface was observed by XL30-1 scanning electronic microscope (SEM). The bench test was made to study the fric- tion performance of nano-diamond powder. The results show that the modified nano-diamond particles can improve the tri-bological behaviors of synthetic worm oil. The engine oil with 0.01% modified nano-diamond particles has a great improve-ment in output, emission, seal and friction reducing properties. The average engine power increases by 4. 2% at whole rota-tional speed range. The idle emission of HC decreases from 8. 75×10-4 to 3.50×10-4,dropped by 60%. The idle emis-sion of NOX decreases from 1.66×10-4 to 1.32×10-4,reduced by 20. 5%. Cylinder pressure increases from 0.441 to 0. 568 Mpa,increased by 28. 9% ,the idle speed increasing rate is 19. 6%.%将纳米铁微粒、纳米铜微粒及纳米金刚石微粒分别分散到不含油性剂和极压抗磨添加剂的半成品合成润滑油中,采用MM-200型磨损实验机和XL30-1扫描电镜等设备研究了纳米微粒的抗磨减摩性,采用发动机台架试验研究了纳米金刚石的摩擦性能.结果表明,纳米金刚石微粒可明显改善润滑油的抗磨减摩性能;纳米金刚石润滑油的油膜有着非常好的抗黏滑能力和承载能力,对摩擦副有自修复作用.在普通发动机润滑油中加入质量分数0.01%的纳米金刚石微粒后,其润滑性能有很大的改善,在相同转速下功率平均提高4.2%;怠速时的HC排放量从8.75×10-4降低到3.50 ×10-4,降低60%,Nox排放量从1.66×10-4降低到1.32×10-4,降低20.5%;油缸的压力从0.441 Mpa增加到0.568MPa,相对增加28.9%;怠速也提高了19.6%.
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