On the rheological behaviour of synthetic fluids thickened by solid additives

✍ Scribed by Vergne, P. ;Prat, P.

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 537 KB
• Volume: 15
• Category: Article
• ISSN: 0265-6582
• DOI: 10.1002/jsl.3000150302

✦ Synopsis

A variety offluid space lubricants, i.e., synthetic oils thickened by solid additives (particles of PTFE and MoS,), has been developed. These lubricants present a solid-like behaviour under yield stress, and a strong non-Newtonian efSect during $ow. Measurement of the yield stresses revealed an unexpectedly strong interaction between a synthetic hydrocarbon oil and one type of PTFE particle. Furthermore, the substitution of 1 vol.% PTFE particles by MoS, particles introduced a significant change in the yield stress values. This effect is also apparent in viscosity measurements. These lubricants display, through their rheological behaviour, good ability to replenish contacts over a wide range of temperatures, as shown by measurements taken at -20°C and -60 "C.