We use cookies to give you the best experience and to help improve our website
Find out what cookies we use and how to disable them
Standards Development
This test method covers the determination of a scuffing temperature of lubricants at prescribed conditions and the retention of friction over temperature step increases in a roller-on-disk (flat) geometry when subjected to high-frequency, linear oscillation motion. This test method is executed under constant load, oscillating frequency and stroke in a SRV-type test machine. The evolution of coefficient of friction of lubricating oils as function of temperature is recorded and assessed. In tribometric tests, scuffing is so far initiated by a.) constant load step increases or b.) constant Hertzian contact stress step increases, as in FZG. This proposed test method determines the upper temperature for operating a lubricant and can also be used to determine the ability of a non-EP lubricant to protect against scuffing with increasing temperature.
In order to meet stricter energy-saving and environmental emission regulations, the downsizing on internal combustion engines, lightweight design approaches in order to save resources, as well as the increase in operating temperature of aviation turbine gas engines, coupled with the development of industrial equipment towards high speed and high loads, the operating temperature of lubricants gradually increase and in consequences the oil film temperatures in the tribo-contacts decreases. At higher operating temperatures, lubricating oils form thinner oil films and the tribofilms protecting against scuffing (adhesive failure) may loose their protective capabilities under such as high temperature, high speed, and high loads, resulting in premature failure of equipment. Therefore, it is necessary to develop a test method in order to determine the upper operating temperature limit of lubricants. This test method can be used to determine the scuffing temperature and the variation of friction coefficient with temperature of lubricants used in frictional contact. With increasing temperature, the evolution of coefficient of friction can change from a low friction to higher friction regime without scuffing and vice versa. It can be used as a screening test for lubricants such as engine oils used under high temperature conditions of up to 300°C . This method is a new development in the field of tribology performance evaluation, providing corresponding testing methods for the variation of lubricants friction coefficient with temperature and the determination of scuffing temperature. It is of great significance for evaluating the influence of temperature on tribological performance of lubricants
Required form fields are indicated by an asterisk (*) character.
You are now following this standard. Weekly digest emails will be sent to update you on the following activities:
You can manage your follow preferences from your Account. Please check your mailbox junk folder if you don't receive the weekly email.
You have successfully unsubscribed from weekly updates for this standard.
Comment by: