The Effect of Composition and Temperature on the Rheological Properties of Greases Based on Calcium Soaps


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Abstract


The knowledge of the rheological properties of the greases based on calcium soaps is important because these properties ensure proper oiling of moving metallic parts of machines at high charges and in a large temperature range. In the present study, four greases has been prepared with different concentration of calcium soap: 5%, 10%, 15% and 20% respectively, in paraffin oil. For viscosity determination of greases, the RHEOTHEST 2 rheoviscometer with coaxial cylinders and HAAKE VT 550 rheoviscometer with cone and plate were used. After the determination of  flow curve τ = f(ỳ), it was found that the greases had a non-newtonian behavior with respect to BINGHAM model, that meaning that the flow curve  characterizing them had a linear form with a flowing threshold. Also, it was studied the variation of viscosity with temperature for grease with 20% calcium soap. It was found that increasing the temperature, the viscosity decreases having decreasing flow thresholds
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Keywords


Greases; Calcium Soaps; Rheological Properties; Rheoviscometer

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References


G.C. Suciu, Hydrocarbons processing engineering (Editura Tehnica, Bucuresti, 1993).

N. Anandan, C.R. Jagga, R.K. Pandey, Tribological behaviour of additive free calcium stearate greases, Tribology on-line 2(2007) 34-39.
http://dx.doi.org/10.2474/trol.2.34

V. Štěpina, V. Veselý, Lubricants and special fluids (Tribology series 23, Elsevier, 1992).
http://dx.doi.org/10.1016/s0167-8922(08)70347-x

A.V. Rădulescu, I. Rădulescu, Rheological models for lithium and calcium greases , Mechanika , no.3 (2007) 67-70.

J.M. Franco, M.A. Delgado, C. Valencia, M.C. Sanchez, C. Gallegos, Mixing rheometry for studying the manufacture of lubricantig greases, Chemical Engineering Science 60(2005) 2409-2418.
http://dx.doi.org/10.1016/j.ces.2004.10.042

S.K. Yeong, P.F.Luckham, Th.F.Tadros, Steady flow and viscoelastic properties of lubricanting grease containing varios thickener concentration, Journal of Colloid and Interface Science 274(2004) 285-293.
http://dx.doi.org/10.1016/j.jcis.2004.02.054

K.P. Gertzos, P.G. Nikolakopoulos, C.A. Papadopoulos, CFD analysis of journal bearing hydrodynamic lubrication by Bingham lubricant, Tribology International 41 (2008) 1190-1204
http://dx.doi.org/10.1016/j.triboint.2008.03.002

G.W. Stachowiak , A.W. Batchelor, Engineering Tribology (Butterworth-Heinemann).
http://dx.doi.org/10.1016/s0167-8922(08)70573-x

Nicoleta Teodorescu, Applied rheology (Editura MATRIX ROM, Bucureşti, 2003).

Perry’s Chemical Engineers’ Handbook, 8h edition (McGraw-Hill Companies, 2008, section 6).

S. Soare, Hydrodinamic processes (Editura Tehnică, Bucureşti, 1979).

A. R. Lansdown, Lubrication and lubricant selection (Professional Engineering Publishing, 2004).

R.P. Chhabra, J.F. Richardson, Non –Newtonian flow in the process industries (Butterworth - Heinemann, 1999).
http://dx.doi.org/10.1016/b978-075063770-1/50006-3


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