SELECTION OF COUPLING AGENTS ON ULTRAFINE Fe_3Al POWDERS AND REACTION MECHANISM
Coupling agent plays an important role in increasing the dispersivity and compatibility between ultrafine Fe 3Al powder and polymer matrix.The single molecular layer saturated adsorption of two coupling agents:stearic acid and A 172 on Fe 3Al powder surface was determined by TG analysis(stearic acid 1 24%,A 172 1 8%).The reaction mechanism between powder surface and coupling agent was studied with IR spectra.With SEM photography the effects of two coupling agents on the dispersivity of Fe 3Al powder into polymer matrix were compared at this adsorption amount.Coupling agent A 172 is the better choice because it can make ultrafine Fe 3Al powder effectively disperse in polymer matrix.