首页> 外文OA文献 >Additive Effect for Environmental Lubricants—Decreased Phosphorus Contents in Low Viscosity Base Oils for Antiwear Performance—
【2h】

Additive Effect for Environmental Lubricants—Decreased Phosphorus Contents in Low Viscosity Base Oils for Antiwear Performance—

机译:对环境润滑剂的累加作用-低粘度基础油中的磷含量降低,以提高抗磨性能-

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Low viscosity base oils are one of the candidates for fuel saving lubricants for internal combustion engines. These lubricants reduce viscous friction under hydrodynamic conditions, so reduce total energy loss at tribological contact. However, these oils provide thinner oil films resulting in magnified wear. Therefore, wear protection of rubbing surfaces is very important to apply low viscosity oils in practice. Effects of phosphorus-containing additives on antiwear properties of low viscosity base oils were evaluated under boundary lubrication conditions using a four-ball type wear tester according to ASTM D 4172. For mineral based oils, dialkyl phosphonates considerably reduced wear whereas trialkyl and triaryl phosphonates did not. Compatibility of additive with mineral based oil depends on the refining process of the oil. Wear prevention by phosphorus-containing additive in solvent-extracted mineral oils was sometimes unpredictable. Additive response for hydrogen-refined mineral oils was better than that for solvent-extracted oils. The results showed good accordance with phosphorus contents on the worn surfaces obtained by surface analysis. At least 0.062 mass% (620 ppm) of phosphorus is required to achieve sufficient antiwear properties in hydrogen-refined mineral oils. Synthetic esters have good lubricity in comparison with mineral oils. However, conventional antiwear additives for mineral oils are not always effective for synthetic esters, especially low viscosity esters. Hydroxyalkyl phosphates, with a polar functional group in the molecule, reduced wear effectively even at 0.016 mass% (160 ppm) of phosphorus in low viscosity synthetic esters. The new additives provided boundary films with high phosphorus contents. Kinetics of the boundary film formation were examined by the electric contact resistance method. Formation of the boundary film from the new additives was higher than that from conventional additives. The replenishment process of the boundary film under dynamic conditions is very important for low viscosity lubricants.
机译:低粘度基础油是用于内燃机的省油润滑剂的候选之一。这些润滑剂减少了流体动力条件下的粘滞摩擦,因此减少了摩擦接触时的总能量损失。但是,这些油会形成较薄的油膜,导致磨损加剧。因此,在实践中摩擦表面的磨损保护对于应用低粘度油非常重要。根据ASTM D 4172,使用四球式磨损测试仪在边界润滑条件下评估了含磷添加剂对低粘度基础油抗磨性能的影响。对于矿物基油,二烷基膦酸酯大大降低了磨损,而三烷基和三芳基膦酸酯却降低了磨损。不。添加剂与矿物基油的相容性取决于油的精制过程。溶剂萃取的矿物油中含磷添加剂的磨损预防有时无法预测。氢精制矿物油的加性响应优于溶剂萃取油。结果表明,与通过表面分析获得的磨损表面上的磷含量具有良好的一致性。为了在氢精制的矿物油中获得足够的抗磨性能,需要至少0.062质量%(620 ppm)的磷。与矿物油相比,合成酯具有良好的润滑性。然而,用于矿物油的常规抗磨添加剂并不总是对合成酯特别是低粘度酯有效。分子中具有极性官能团的羟烷基磷酸酯即使在低粘度合成酯中的磷为0.016质量%(160 ppm)时也可以有效地减少磨损。新的添加剂为边界膜提供了高磷含量。通过电接触电阻法检查了边界膜形成的动力学。由新添加剂形成的边界膜比由常规添加剂形成的边界膜高。在动态条件下边界膜的补给过程对于低粘度润滑剂非常重要。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号