FRICTION AND WEAR MEASUREMENTS USING A MODIFIED MTM TRIBOMETER
Publication Date: 2002-Aug-07
The IP.com Prior Art Database
Of the many tribometers that PCS Instruments designs and manufactures, the Mini-Traction Machine (MTM) measurement system is one of the most popular. The instrument was designed to make traction measurements with an optional pin-on-disk friction and wear attachment. According to the manufacturer, use of the optional friction and wear attachment would allow differentiation of the friction and wear performance of various lubricants. By our determination, we have found that this attachment offered by PCS Instruments does not perform as expected. Therefore, over the past year, we successfully made a modification to the MTM that allows us to obtain friction and wear data. The modification involved the use of a ball-on-disk tribocouple in the pin-on-disk mode of the MTM. The data obtained differentiates friction and wear between various lubricants. Results show that alkyl zinc dithiophosphate (ZnDTP) gives better wear performance than alkaryl ZnDTP, which gives better wear performance than base oil. We can differentiate the performance of the alkyl ZnDTP from the base oil at the 95% confidence level. The results of this work corroborate earlier results obtained with the Godfrey tribometer using ZnDTPs in the presence of carbon black. Thus we believe that the modified MTM measurement system described in this publication provides a reliable method for determining friction and wear data of various supplemental wear inhibitors.