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Preparation and tribology of aerogel silica and alumina‐silica as lubricant oil additives
Author(s) -
Dong J. X.,
Hu Z. S.,
Chen G. X.
Publication year - 1999
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010110306
Subject(s) - aerogel , materials science , lubricant , tribology , chemical engineering , composite material , dispersant , adsorption , dispersion (optics) , organic chemistry , chemistry , physics , optics , engineering
Aerogel silica and an aerogel mixture of aluminium and silica were prepared using the ethanol supercritical fluid drying technique. Their physical properties were characterised using XRD, transmission electron microscopy, (TEM), and N 2 adsorption. The tribological properties of a 500 SN oil containing the aerogel and a dispersing agent were evaluated using a four‐ball machine and a block‐on‐ring tribotester. Results indicated a greater wear resistance and load‐carrying capacity and a lower friction coefficient than for the basic oil. In the oil, the aerogel worked by its deposition on the rubbing surface. Copper stearate was superior to dodecyl alcohol as a dispersing additive, and ultrasonic treatment helped promote the dispersion of the aerogel in oil. There existed an optimum ratio of aluminium isopropyl alcoholate to tetraethanol silicate. The corresponding aerogel mixture gave a maximum value of P E .