WEAR TESTING MEASUREMENT

Wear is a process of removal of material from one or both of
two solid surfaces in solid state contact. As the wear is a surface removal
phenomenon and occurs mostly at outer surfaces, it is more appropriate and
economical to make surface modification of existing alloys than using the
wear resistant alloys.
6.1 EXPERIMENTAL PROCEDURE OF WEAR TEST
Dry sliding wear tests for different number of specimens was
conducted by using a pin-on-disc machine (Model: Wear & Friction
Monitor TR-20) supplied by DUCOM is shown in Figure 6.1.
Figure 6.1 Wear testing machine
The pin was held against the counter face of a rotating disc
(EN31 steel disc) with wear track diameter 60 mm. The pin was loaded
against the disc through a dead weight loading system. The wear test for all
specimens was conducted under the normal loads of 20N, 40N and a
sliding velocity of 2 and 4 m/s.
Wear tests were carried out for a total sliding distance of
approximately 3000 m under similar conditions as discussed above.
The pin samples were 30 mm in length and 12 mm in diameter. The
surfaces of the pin samples were slides using emery paper (80 grit size)
prior to test in order to ensure effective contact of fresh and flat surface
with the steel disc. The samples and wear track were cleaned with acetone
and weighed (up to an accuracy of 0.0001 gm using microbalance) prior to
and after each test. The wear rate was calculated from the height loss
technique and expressed in terms of wear volume loss per unit sliding
distance.
In this experiment, the test was conducted with the following
parameters:
1. Load
2. Speed
3. Distance
In the present experiment the parameters such as speed, time
and load are kept constant throughout for all the experiments.
These parameters are given in Table 6.1.