TRIBOTECHNICAL CHARACTERISTICS OF TUGSTEN DICHALCOGENIDES REINFORCED POLYHETEROARYLENE PM-DADPHE MATRIX COMPOSITE COATINGS UNDER SLIDING FRICTION IN LIQUID LUBRICANTS
In general, a promising material for matrices are thermoplastic polymers, including polyimides (poligeteroarilena), which must satisfy two conditions: polyimide prepolymers must be soluble to ensure even distribution of the filler in the volume of the generated matrix; end binder should have the ability to flow or melt at temperatures exceeding the softening point of the polymer. The most effective way of obtaining the desired thermoplastic properties for polyimides is to make them on the basis of macromolecules having a linear structure containing hinged junctions in the chain. This paper presents a polyimide PM-DADFE that is destructive almost without softening. The possibility of forming the compositions and the respective polyimide coatings is determined by processing properties of prepolymer PM-DADFE from the solution. The goal of this work is to study and evaluate the tribological properties of composite coatings with a matrix from polyimide PM-DADFE and the fillers of chalcogenides nanoparticles of tungsten WSe2 and WS2 in various concentrations by friction in the environment of lubricating oil. Based on the analysis of literature, as a polymer binder, there was chosen a linear polyimide PM- DADFE with hinged junctions. As a result of the present research, there were obtained experimental data confirming the effectiveness of the underlying poligeteroarilena cover "PM-DADFE" without fillers: in tougher test conditions frictional torque for the coating is less than that of the substrate by 83%, crater wear width for the base coating is less by 30% than that of the substrate. Developed coatings with nanoparticles of tungsten disulphide belong to the anti-frictional.Thus, their use is possible in lightly loaded friction units.