Thermal, spectroscopic and rheological study of mineral base lubricating oils
The thermal degradation process of mineral base lubricating oils was studied in this work by means of thermal, spectroscopic and rheologic analysis. The lubricating oils were degraded at temperatures varying from 150 to 210 deg C, and for degradation times from 1 to 48 h. After the degradation, the...
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| Veröffentlicht in: | Journal of thermal analysis and calorimetry 2007-03, Vol.87 (3), p.639-643 |
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| container_title | Journal of thermal analysis and calorimetry |
| container_volume | 87 |
| creator | SANTOS, J. C. O LIMA, L. N SANTOS, Ieda M. G SOUZA, A. G |
| description | The thermal degradation process of mineral base lubricating oils was studied in this work by means of thermal, spectroscopic and rheologic analysis. The lubricating oils were degraded at temperatures varying from 150 to 210 deg C, and for degradation times from 1 to 48 h. After the degradation, the lubricating oils were characterized by X-ray fluorescence, IR and NMR spectroscopies, rheological properties and thermal analyses (TG/DSC). The spectroscopic analyses determined the oxidation reaction products. TG curves indicate that the thermal stability of lubricating oils is below 161 deg C. TG curves in air present three mass loss stages, whereas in nitrogen there are only two mass loss steps. DSC analyses in air indicate two highly exothermic peaks related to hydrocarbon oxidation and combustion processes, while in nitrogen only two endothermic peaks were observed. The decrease in the degradation temperature led to a decrease of the lubricant viscosity. |
| doi_str_mv | 10.1007/s10973-006-7773-1 |
| format | Article |
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DSC analyses in air indicate two highly exothermic peaks related to hydrocarbon oxidation and combustion processes, while in nitrogen only two endothermic peaks were observed. The decrease in the degradation temperature led to a decrease of the lubricant viscosity.</description><subject>Applied sciences</subject><subject>Chemical industry and chemicals</subject><subject>Composition, physical and chemical properties</subject><subject>Exact sciences and technology</subject><subject>Friction, wear, lubrication</subject><subject>Machine components</subject><subject>Mechanical engineering. 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TG curves indicate that the thermal stability of lubricating oils is below 161 deg C. TG curves in air present three mass loss stages, whereas in nitrogen there are only two mass loss steps. DSC analyses in air indicate two highly exothermic peaks related to hydrocarbon oxidation and combustion processes, while in nitrogen only two endothermic peaks were observed. The decrease in the degradation temperature led to a decrease of the lubricant viscosity.</abstract><cop>Dordrecht</cop><pub>Springer</pub><doi>10.1007/s10973-006-7773-1</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Applied sciences Chemical industry and chemicals Composition, physical and chemical properties Exact sciences and technology Friction, wear, lubrication Machine components Mechanical engineering. Machine design Oils and fats |
| title | Thermal, spectroscopic and rheological study of mineral base lubricating oils |
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