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| 1 | New strategy for reducing the EHL friction in steel contacts using additive-formed oleophobic boundary films显示文摘In this study we present a mechanism for the elastohydrodynamic(EHD)friction reduction in steel/steel contacts,which occurs due to the formation of oleophobic surface boundary layers from common boundary-lubrication additives.Several simple organic additives(amine,alcohol,amide,and fatty acid)with different molecular structures were employed as the model additives.It was found that the stronger chemisorption at 100℃,rather than the physisorption at 25℃,is more effective in friction reduction,which reaches 22%.What is more,EHD friction reduction was obtained in steel/steel contacts without use of the diamond-like carbon(DLC)coatings with their wetting or thermal effect,which was previously suggested as possible EHD friction reduction mechanism;yet about the same friction reduction of about 20%was obtained here—but with much simpler and less expensive technology,namely with the adsorbed oleophobic surface layers.A small variation in the additive’s molecular structure results in significant changes to the friction,indicating good potential in future EHD lubrication technology,where these additives could be designed and well optimised for notable reduction of the friction losses in the EHD regime. | Mitjan KALIN Maja KUS | 2021 | Friction2021，9，6： | 6 |
| 2 | Influence of roughness on wear transition in glass-infiltrated alumina显示文摘 | Mitjan Kalin Said Jahanmir | 2003 | Wear2003，255，： | 1 |
| 3 | 界面滑移对阶梯滑块轴承润滑行为的影响显示文摘目的研究入/出口阶梯面界面滑移对阶梯轴承油膜厚度和摩擦因数的影响。方法通过建立考虑入/出口阶梯面不同程度的界面滑移的一维阶梯滑块模型,求解不同入/出口滑移比例下的油膜厚度和摩擦因数。在阶梯滑块工作面制备含氟类金刚石涂层(F-DLC),在平行间隙条件下研究了有无含氟类金刚石涂层对油膜润滑性能的影响,并与理论计算结果进行比较。结果当滑移只发生在入口阶梯面时,随着滑移程度的增大,油膜厚度增大,摩擦因数减小;当滑移只发生在出口阶梯面时,随着滑移程度的增大,油膜厚度减小,摩擦因数减小。当润滑油在入口和出口阶梯面均发生滑移时,会产生油膜厚度及摩擦因数同时减小或油膜厚度增大而摩擦因数减小2种结果。试验结果表明,F-DLC涂层阶梯滑块的膜厚最大且摩擦因数最小,没有涂层的结论与之相反。产生这一特殊现象是由于润滑油在阶梯滑块入口区和出口区的滑移程度不同。由于激光加工形成了微凸体结构以及F-DLC涂层的协同作用,入口区的滑移程度比出口区的大,从而膜厚增大;同时滑移的存在使其摩擦因数降低。结论在入/出口的界面滑移对阶梯滑块轴承的影响下,会产生2种结果,得到了可以同时满足油膜承载力增大且摩擦因数减小的入/出口滑移比例关系。通过试验验证了在阶梯滑块表面发生一定滑移的条件下,会在理论计算的油膜厚度增大的同时出现摩擦因数减小的情况。 | 荆兆刚 郭峰 金微 MITJAN Kalin MARKO Polajnar 王永强 刘成龙 | 2023 | 表面技术2023，52，12： | 1 |
| 4 | Influence of Flash Temperatures on the Tribological Behaviour in Low-speed Sliding a Review显示文摘 | Mitjan Kalin | 2004 | Materials Science and Engineering2004，374，： | 1 |
| 5 | Influence of flash temperatures on the tribological behaviour in low-speed sliding: a review显示文摘 | Mitjan Kalin | 2004 | Materials Science & Engineering A2004，，1： | 1 |
| 6 | Differences in nano-topography and tribochemistry of ZDDP tribofilms from variations in contact configuration with steel and DLC surfaces显示文摘In this work,we evaluated the effect of the counter-body material(the same or dissimilar)and contact configuration(moving or stationary body),at similar contact tribological conditions,on the tribochemical and nanotopography characteristics of adsorbed surface films.Zinc dialkyldithiophosphate(ZDDP),the best performing anti-wear additive,was used in self-mated steel/steel and DLC/DLC contacts,which were compared with mixed steel/DLC and DLC/steel contacts in 1-h and 6-h sliding tests.The macroscale(tribometer)and nanoscale(atomic force microscopy)friction,thickness,topography,and chemical(attenuated total reflection-Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy)properties of the tribofilms were studied.The results revealed unexpectedly large differences in all the studied tribofilm parameters;this is because all the tribofilms are completely different;this includes the chemical composition,which is known to have a crucial effect on the nano-and macro-scale tribological properties.These results clearly demonstrate that the surface material,additives,and common contact operating parameters,that is,pressure,velocity,and temperature,crucially affect the ZDDP tribofilm as well as the position of the moving or stationary surface within the contact,and the material of the moving/stationary bodies. | Lucija COGA Somayeh AKBARI Janez KOVA Mitjan KALIN | 2022 | Friction2022，10，2： | 0 |
| 7 | Base lubricants for green stamping:The effects of their structure and viscosity on tribological performance显示文摘The requirements for green and sustainable manufacturing mean that stamping lubricants must be continuously re-evaluated and re-designed.In this investigation,the tribological performance of four base oils with different chemical structures(paraffinic and naphthenic)and viscosities(2 and 20 cSt),as well as water,was evaluated for the stamping of steel sheets and compared with a non-lubricated contact.Most lubricants reduce the coefficient of friction and maintain a similar wear coefficient for steel sheets as in dry contacts.Low-viscosity(LV)naphthenic oil performs very like both high-viscosity(HV)oils.A surprising exception is the LV paraffinic oil,with several-times-higher friction and wear compared to dry contact.This is due to the excellent wetting-spreading and very low cohesion forces that enable oil to escape from extremely thin-film contacts because the viscosity is so low,leading to lubricant starvation.In contrast,HV oils provide a sufficiently thick lubricating film,while strong cohesive forces help in the film’s strength,lessening wear,and reducing friction.In thin-film lubrication with LV oils,such as when stamping,it is thus extremely important that the lubricant’s wetting behaviour and viscosity are sufficient to provide enough film in the contact and prevent starvation,thus ensuring lower friction,less wear,and a longer lifetime of the contact. | Marko POLAJNAR LucijaČOGA Mitjan KALIN | 2023 | Friction2023，11，9： | 0 |
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