Currently,Bio-lubricants are still regarded as niche products.Within the global lubricant market,however,the area of environmentally acceptable fluids represents one of the fast growing markets with an estimated annua...Currently,Bio-lubricants are still regarded as niche products.Within the global lubricant market,however,the area of environmentally acceptable fluids represents one of the fast growing markets with an estimated annual growth of more than 6% per year.This growth is supported by various market drivers such as legal regulations,public subsidies and the implementation of national or international labeling schemes.With the implementation of the European Ecolabel for lubricants in 2005,a common standard specifying ecological and performance requirements for Bio-lubricants was defined.Applying for the EU Ecolabel requires a comprehensive assessment,not only of the final formulation,but also of the additives used.Additives are required to meet specifications for oxidation and thermal stability,as well as to impart metal protection(of both steel and yellow metals),thus improving corrosion protection and wear performance of the formulation.Therefore,it is challenging in terms of formulation technology to develop the right formulation that meets the technical specifications as well as the stringent requirements of the EU-Ecolabel.The paper describes how,by using ester base fluids and additives currently available in the market,lubricants can be developed to meet the technical and eco-toxicological requirements of the EU-Ecolabel,approaching the performance levels of lubricants formulated with traditional base fluids.展开更多
The cooperative effect of laser surface texturing(LST) and double glow plasma surface alloying on tribological performance of lubricated sliding contacts was investigated.A Nd:YAG laser was used to generate microdimpl...The cooperative effect of laser surface texturing(LST) and double glow plasma surface alloying on tribological performance of lubricated sliding contacts was investigated.A Nd:YAG laser was used to generate microdimples on steel surfaces. Dimples with the diameter of 150μm and the depth of 30-35μm distributed circumferentially on the disc surface.The alloying element Cr was sputtered to the laser texturing steel surface by double glow plasma technique.A deep diffusion layer with a thickness of 30μm and a high hardness of HV900 was formed in this alloy.Tribological experiments of three types of samples(smooth,texturing and texturing+alloying) were conducted with a ring-on-disc tribometer to simulate the face seal.It is found that,in comparison with smooth steel surfaces,the laser texturing samples significantly reduce the friction coefficient.Moreover,the lower wear rate of the sample treated with the two surface techniques is observed.展开更多
文摘Currently,Bio-lubricants are still regarded as niche products.Within the global lubricant market,however,the area of environmentally acceptable fluids represents one of the fast growing markets with an estimated annual growth of more than 6% per year.This growth is supported by various market drivers such as legal regulations,public subsidies and the implementation of national or international labeling schemes.With the implementation of the European Ecolabel for lubricants in 2005,a common standard specifying ecological and performance requirements for Bio-lubricants was defined.Applying for the EU Ecolabel requires a comprehensive assessment,not only of the final formulation,but also of the additives used.Additives are required to meet specifications for oxidation and thermal stability,as well as to impart metal protection(of both steel and yellow metals),thus improving corrosion protection and wear performance of the formulation.Therefore,it is challenging in terms of formulation technology to develop the right formulation that meets the technical specifications as well as the stringent requirements of the EU-Ecolabel.The paper describes how,by using ester base fluids and additives currently available in the market,lubricants can be developed to meet the technical and eco-toxicological requirements of the EU-Ecolabel,approaching the performance levels of lubricants formulated with traditional base fluids.
基金Project(2007046) supported by High Technology Research Project of Jiangsu Province,China
文摘The cooperative effect of laser surface texturing(LST) and double glow plasma surface alloying on tribological performance of lubricated sliding contacts was investigated.A Nd:YAG laser was used to generate microdimples on steel surfaces. Dimples with the diameter of 150μm and the depth of 30-35μm distributed circumferentially on the disc surface.The alloying element Cr was sputtered to the laser texturing steel surface by double glow plasma technique.A deep diffusion layer with a thickness of 30μm and a high hardness of HV900 was formed in this alloy.Tribological experiments of three types of samples(smooth,texturing and texturing+alloying) were conducted with a ring-on-disc tribometer to simulate the face seal.It is found that,in comparison with smooth steel surfaces,the laser texturing samples significantly reduce the friction coefficient.Moreover,the lower wear rate of the sample treated with the two surface techniques is observed.
