The MFT5000 is a versatile multi-functional
mechanical property tester capable of simulating a
vast number of tribology and wear tests on the
same platform. This application note shows how the
MFT5000 is used to run a very common tribology
and wear test – pin/ball on disc. This test method
covers a laboratory procedure for determining the
wear and friction of materials, liquid and lubricants
etc. during sliding using a pin on disk or ball on disk setup.
The tribometer causes stationary pin/ball to press against the rotating disk at a known force and speed. During the test coefficent of friction (COF), friction force, wear and several other parameters are measured and reported. The setup for dry conditions is shown in Figure. This set up is ideal for characterizing tribological properties of alloys, ceramics, polymers, bulk materials, coatings, solid lubricants etc. with respect to a counter material in non-lubricated conditions. Figure shows the set up
in lubricated conditions with the samples submerged in lubricant.
Figure shows the ball wear mark after the test.
Figure shows the comparison of coefficient of
friction w.r.t. time for four specimens under
same load and rotation speed against a Cr6 ball
of 10mm diameter at 200C. The coating on
sample 1 breaks the fastest while sample 2
shows low friction throughout the test. At the
MFT platform it is possible to do such tests at
room or at high temperatures.
Rtec multi-function tribometer comes with an optional inline 3D Profilometer. The profilometer automatically measures the surface topography of the wear track at pre-set intervals defined by the user e.g. after a certain number of cycles, duration of time or at the on-set of an event such as increase in friction. The XY stage is equipped with advanced encoders to automatically move the sample between the test and image area. The ability to quantifiably characterize the change in surface topography and wear track with time and combining it with friction data makes the analyses extremely powerful.