Sliding wear properties of high purity copper in cryogenic environment
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In an effort to understand the influence of cryogenic environment on the friction and wear properties of metallic materials, we performed a series of experiments on high purity work hardened copper (Cu) samples in liquid nitrogen (LN2) environment against steel (bearing grade; SAE 52100) at varying loads and sliding speeds. The load was varied between 10 and 20 N and sliding speed was varied between 0.89 and 1.34 m/s. In our experiments, a reduction in the steady state coefficient of friction (μF) was noted with increasing load (10, 15, 20 N) at the highest sliding speed of 1.34 m/s. High wear rate of the order of 10−4 mm3/Nm was recorded, which was found to be independent of the load/sliding speed. On the basis of the experimental data and the characteristics of the worn surfaces it is confirmed that significant damage accumulation and plowing-induced material removal contribute to the wear losses. It is noteworthy that oxidative wear or mechanically mixed layer (no transfer from steel counter-body) did not occur to any significant extent under the chosen sliding conditions. The characteristics of the wear damage as a result of cryogenic sliding have been discussed with reference to the prevailing stress conditions and contact temperature.
KeywordsWear Rate Wear Surface Wear Track Wear Volume Copper Sample
The authors would like to thank Mr. Ankit Mishra for his assistance with tribological experiments.
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