Reciprocating tests, wear test

Not only can molecular design improve the miscibility with other oils, it can also confer ILs with special functions, such as antioxidation and the ability to adapt to a broader temperature range. We synthesized three imidazolium-based ILs containing sterically hindered phenol groups with antioxidant functions and evaluated the tribological behaviors of these ILs as additives for PEG appfication in steeFsteel contacts on an Optimol SRV-IV oscillating reciprocating friction and wear tester, as well as on MRS-IJ four-ball testers [100]. The rotary bomb oxidation test (RBOT) test, thermal analysis, and Cu strip test results revealed that synthesized ILs possessed excellent antioxidation capability. 

Each test specimen was subjected to a constant load and a fixed cycle of reciprocating motion. Long term wear tests were performed with the total sliding distance in each case extending to several hundred km. The material removed by wear was monitored by periodic measurements of the weight of the UHMWPE wear pins on a Mettler microbalance with a sensitivity of 1 g Density measurements enabled volume loss (V) against sliding distance (X) relationships to be established at each load (P) and wear factors (k) were then determined from the relationship. 

Figure 7. Reciprocating wear tests of a plastic tedl on a flat plastic counterface. Wear on both members is recorded Couple D was a PTFE/silicone-filled polycarbonate ball and an acetal/PTFE counterface. The worst couple (H) was the same rider as D with a polyphenylene sulfide counterface.

Reciprocating wear tests have shown that conversion coatings and oxidized surfaces provided some improvement in wear characteristics, but when conversion coated samples were also oxidized, a marked improvement was noted. The conversion coating increases the oxidation rate of titanivim at about 425 °C (800 °F) and may increase oxidation rates at temperatures up to 595 °C (1100 °F). The original coating is retained above the titanium oxide layer. 

Abrasive wear, 3-boa plate in a slurry bath, bk>ck-on> rotating ring in a slurry bath, ball mill, or tumbling wear test... 

Wear tests were carried out using a pin-on-reciprocating-plate apparatus instrument in which... 

S Sheasby, T A Caughlin, A G Blahey and K F Laycock, A reciprocating wear test for evaluating boundary lubrication . Tribology International, 23, No 5, pp 301-307, 1990... 

A pin on flat apparatus (Fig. 2) was used to measure wear rate under concentrated contact and reciprocating motion. The square plate is made of alumina, zirconia or alumina/zirconia nanocomposite ceramics. The pin of medical grade alumina had an end face with 10 mm spherical radius. The lower plate oscillates while the vertical load is applied to the pin by dead weights. Friction force is measured with strain gauges attached to the double leaf springs. Applied load is 30 N, oscillation frequency is 2 c/s, stroke is 10 mm and mean sliding velocity is hence 40 mm/s. Wear test was performed in 30 vol.% bovine serum solution kept at 37 °C. Wear volume of the pin was calculated from the area of the wear surface while the wear volume of the disc was calculated by the weight loss. 

During reciprocating wear tests balls were also subjected to wear, as shown in Figure 8 and Figure 9... 

Following conclusions can be drawn according to the results of reciprocating wear tests conducted on ZrN and Zr(2l% HON coatings under dry sliding conditions by utilising AFOi and steel balls. 

To investigate the anti-wear properties of the ring zone samples, the contact performance of the cold start samples is being evaluated using High Frequency Reciprocating Rig (HFRR) techniques. The very small samples required for each test are ideal for the small sample volumes available. Initial results from the HFRR test show reduced anti-wear performance for the initial cold start samples. The initial results are in accord with the results from the loss of other additives from the initial run period samples. The further results for the HFRR wear tests will be reported later elsewhere. 

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