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Seabra, Jorge
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Topics
Publications (14/14 displayed)
- 2023Direct Energy Deposition Parametric Simulation Investigation in Gear Repair Applicationscitations
- 2020Tribological Investigation on the Friction and Wear Behaviors of Biogenic Lubricating Greases in Steel–Steel Contactcitations
- 2016TRIBOLOGICAL TESTING OF THERMALLY AGED GREASES
- 2015FORMULATION, RHEOLOGY AND THERMAL AGING OF POLYMER GREASES
- 2012Low-loss austempered ductile iron gears: Experimental evaluation comparing materials and lubricantscitations
- 2011Low torque loss gears: austempered ductile iron versus carburized steelcitations
- 2011Theoretical and experimental investigations about flank breakage in bevel gearscitations
- 2008Austempered ductile iron (ADI) gears: Power loss, pitting and micropittingcitations
- 2006Friction coefficient in FZG gears lubricated with industrial gear oils: Biodegradable ester vs. mineral oilcitations
- 2005Artificial indentations for the study of contact fatigue of austempered ductile iron (ADI) discscitations
- 2004Contact fatigue behaviour of artificially indented austempered ductile iron discs
- 2002ADI behaviour under twin-disc contact fatigue tests
- 2002Austempered ductile iron with tempered martensite
- 2000Experimental observations of contact fatigue crack mechanisms for austempered ductile iron (ADI) discscitations
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document
FORMULATION, RHEOLOGY AND THERMAL AGING OF POLYMER GREASES
Abstract
The aim of this work is to show the correlation between polymer greases' rheology and its formulation. The tested polypropylene (PP) thickened greases were evaluated regarding their thickener content and its effect on the rheological properties. An artificial aging procedure was performed by heating fresh grease samples in an oven, to study the thermal degradation. The aging evaluation was performed through rheological measurements, FT-IR spectra, oil loss, bleed-oil viscosity changes and bleed rate. The rheology measurements were performed on a rotational rheometer, emphasising on the storage and loss moduli values at the Linear Visco-Elastic (LVE) region.