Two mineral oil greases and five synthetic base greases were subjected to steady laminar shearing motion in the range 0–40,000 sec−1 at the temperature of 19 ‡C, 58 ‡C and 90 ‡C. Three silicone base oils were also submitted to the same experimental programme.
A new geometry, namely the ring and plate was used in the programme and it appeared to function satisfactorily.
Conclusions are drawn on the relative mechanical and temperature stability of the mineral and synthetic base greases. All the materials except one (Aero Shell Grease 15) were reduced by theRee, Eyring formula. The Aero Shell Grease 15 exhibited a maximum in the shear stress — shear rate curves for all three temperatures.
KeywordsPolymer Silicone Shear Stress Shear Rate Grease
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