High Speed Civil Transport (HSCT) Hydraulic Fluid Development

U.S. Air Force Perfluoropolyalkylether Experiences

“…In the 1990s, NASA and General Electric Company worked to develop a 300-passenger, Mach 2.4 cruise speed aircraft (Gschwender, et al (11)). AFRL recommended several chemical classes capable of operating at 315 • C but because the plan was for engines nozzle actuation with hydraulic fluid, NASA and the engine company mandated a nonflammable hydraulic fluid.…”

Effect of chemical structure on film‐forming properties of seed oils

“…The fi lm thickness and related elastohydrodynamic lubrication (ehl) properties of a number of categories of lubricating oils of varying chemical structures have been investigated by several groups [13][14][15][16][17][18][19][20][21][22][23][24]. In almost all of these investigations, the properties of oils of a specifi c category were compared relative to that of a commonly used oil category, mainly polyalphaolefi ns (PAO).…”

“…The categories of oils investigated include mineral oils (MOs) [13,14], paraffi nic oils (POs) [15][16][17][18], dicyclo hexane [19], PAO [13,14,[17][18][19][20][21][22], multialkylated pentane (Pennzane) [17,18], carboxylic esters (EST) [13,19,23], polyphenyl ethers (PPE) [20], vegetable oils [15,16], glycerol [15], ionic liquids (ILs) [22], chlorotrifl uoro ethylenes (CTFE) [20,21], perfl uorinated polyalkyl ethers (PFPAE) [17,18,20,24], alkyl/aryl methyl siloxanes (MS) [20], trifl uoro propylmethyl siloxanes (FS) [20] and silahydrocarbons (SiR 4 ) [17,18].…”

“…Gschwender et al [24] investigated the fi lm thickness, pvc, tvc and other properties of six commercial PFPAE oils (Fomblin and Demnum). These oils have the general structure of either -[C2F4O]x-[CF2O]y-or -[C3F6O]z-, but the exact structures of the investigated oils were not provided.…”