Carbon nanotubes/silicon nitride nanocomposites for gasoline lubricated high pressure pumps
Carbon nanotubes/silicon nitride nanocomposites for gasoline lubricated high pressure pumps
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DOI：
10.1016/j.compositesb.2014.04.017
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发表时间：
2014-08
影响因子：
13.1
通讯作者：
C. Pfister;J. Schneider;P. Miranzo;M. Osendi;M. Belmonte
中科院分区：
文献类型：
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作者：
C. Pfister;J. Schneider;P. Miranzo;M. Osendi;M. Belmonte
高压汽油直喷系统能够大大降低燃油消耗和有害气体排放，但目前的金属部件应该被具有增强摩擦学性能的新型先进材料所取代。在这项工作中，多壁碳纳米管(MWCNTs)/氮化硅（Si3N4）纳米复合材料在高压3活塞原型汽油泵中进行了测试，使用凸轮/推杆自配系统和纳米复合材料凸轮/钢AISI 52100推杆配置。si3n4滑动系统也作为参考材料进行了测试。MWCNTs纳米复合凸轮与钢推杆的组合在高转速和高输送压力下表现出出色的性能，其机械效率超过0.95，循环变化小，扭矩振荡比其他测试材料组合低75%。MWCNTs有利于形成包裹碎片的表面韧窝，并促进与钢推进器的摩擦化学反应，提高机械效率。
High pressure gasoline direct injection systems are able to considerably reduce both the fuel consumption and the harmful emissions, but the current metallic components should be replaced by new advanced materials with enhanced tribological properties. In this work, multi-walled carbon nanotubes (MWCNTs)/silicon nitride (Si3N4) nanocomposites have been tested in a high-pressure 3-piston prototype pump for gasoline using both a cam/pusher self-mated system, and a nanocomposite cam/steel AISI 52100 pusher configuration. Si3N4sliding systems were also tested as reference material. MWCNTs nanocomposite cams in combination with steel pushers present an outstanding performance at high rotation speeds and delivery pressures, showing mechanical efficiencies beyond 0.95, low cyclic variations, and torque oscillations 75% lower than the other tested material combinations. MWCNTs favour the formation of surface dimples where debris are entrapped, and promote tribochemical reactions with the steel pushers, enhancing the mechanical efficiency.