Loading...
Please wait, while we are loading the content...
Similar Documents
Tribological Behavior of Reduced Graphene $Oxide–Al_{2}O_{3}$ Nanofluid: Interaction among Testing Force, Rotational Speed and Nanoparticle Concentration
| Content Provider | MDPI |
|---|---|
| Author | Wang, Chenglong Sun, Jianlin Kong, Linghui He, Jiaqi |
| Copyright Year | 2022 |
| Description | The tribological properties of nanofluids are influenced by multiple factors, and the interrelationships among the factors are deserving of further attention. In this paper, response surface methodology (RSM) was used to study the tribological behavior of reduced graphene $oxide–Al_{2}O_{3}$ $(rGO-Al_{2}O_{3}$) nanofluid. The interaction effects of testing force, rotational speed and nanoparticle concentration on the friction coefficient (μ), wear rate $(W_{r}$) and surface roughness $(R_{a}$) of steel disks were investigated via the analysis of variance. It was confirmed that all the three input variables were significant for μ and $W_{r}$ values, while testing force, nanoparticle concentration and its interaction with testing force and rotational speed were identified as significant parameters for $R_{a}$ value. According to regression quadratic models, the optimized response values were 0.088, 2.35 × $10^{−7}$ $mm^{3}·N^{−1}·m^{−1}$ and 0.832 μm for μ, $W_{r}$ and $R_{a}$, which were in good agreement with the actual validation experiment values. The tribological results show that 0.20% was the optimum mass concentration which exhibited excellent lubrication performance. Compared to the base fluid, μ, $W_{r}$ and $R_{a}$ values had a reduction of approximately 45.6%, 90.3% and 56.0%. Tribochemical reactions occurred during the friction process, and a tribofilm with a thickness of approximately 20 nm was generated on the worn surface, consisting of nanoparticle fragments (rGO and $Al_{2}O_{3}$) and metal oxides $(Fe_{2}O_{3}$ and FeO) with self-lubrication properties. |
| Starting Page | 5177 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma15155177 |
| Journal | Materials |
| Issue Number | 15 |
| Volume Number | 15 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-07-26 |
| Access Restriction | Open |
| Subject Keyword | Materials Coatings and Films Reduced Graphene Oxide Tribology Nanofluid Lubrication Mechanism Response Surface Methodology |
| Content Type | Text |
| Resource Type | Article |
