Research Article
Experimental Evaluation of Oxide Nanoparticles as Friction and Wear Improvement Additives in Motor Oil
Table 1
Surface parameters of the samples used in this work.
| | Liner | PVD CrN Ring |
| Surface arithmetic roughness (m) | 0.468 | 0.288 | Surface RMS roughness (m) | 0.677 | 0.402 | Skewness | −2.132 | −0.762 | Kurtosis | 8.606 | 6.270 | Maximum peak height (m) | 2.247 | 5.290 | Maximum valley depth (m) | −4.565 | −3.223 | Maximum height (m) | 6.812 | 8.513 |
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