SYNTHESIS AND EVALUATION OF C-ETHER FORMULATIONS FOR USE AS HIGH TEMPERATURE LUBRICANTS AND HYDRAULIC FLUIDS

摘要

Blends of disiloxanes or low molecular weight C-ethers with C-ethers produce fluids with pour points of -40℃ or lower. These new low pour point mixtures have evaporation losses and oxidative stability comparable to reference C-ether oils.nAn unformulated C-ether lubricated an 80-mm ball bearing only about one hour at 316℃ before catastrophic cage wear occurred. Additives increased the time to failure to 50 or more hours. The best additive, perfluoroglutaric acid, allowed the bearing to run 100 hours without the cage wear failure.nA Vickers PV3-044 hydraulic pump ran for three hours at 260℃ using a formulated C-ether lubricant before failure of wear parts occurred.