Plugatarev A. Increasing of parts wear resistance of fuel injection equipment of diesel engine

The dissertation shows that using of nanopowders in chromium electrolytes is a promising direction during working area formation with given service properties and technological capability enhancement. A new process of uniform crystallization of nanoagents during chrome plating, providing high hardness and increased wear resistance, was proposed. The modern methods of the analysis of the structure, mechanical and service properties of film coatings are widely used when conducting research. For these purposes X-ray diffraction, metallographic, electron microprobe analysis, emission microscopy, microhardness and wear resistance evaluation were used. New methods of diagnosis of parts wear and hardened coating condition during their operation were developed and used. Based on theoretical and experimental studies, kinetics and mechanism of the wear of parts film coating of the fuel supply system were examined, which are amorphous compound, consisting of W-Co-C, and the nanodiamond film forming in triboprocess is the basic strengthening phase. During the wear it fractures, crumbles away, then reforms, and process goes around the cycle. It was determined that it is possible to replace the film coating W-Co-C by using chrome plating process, modified by nanoagents with uniform distribution of inclusions in restored layer. Input parameters of nanoagents during chrome plating, which ensure grain refining, hardness increasing up to the level of film coating W-Co-C, gas evolution reduction in the restoration process were proposed. Based on theoretical and experimental research results, coating composition is determined. There were developed new aggregate technology and renovation equipment that comprise of evaluation of parts wear-out condition, coating rests stripping method, surface preparation for application of strengthening layer (carrying out of activation) with providing of adhesion strength, as well as process variables and quality control recommendations. Theoretical and experimental studies were used at the "Dieselservice" company (Kharkiv) to make a stand for control of worn-out parts condition and equipment for chrome plating with nanodiamonds, enabling to strip rests of worn-out coatings and apply new ones. The parts wear resistance, restored by developed method, increases 1,5-2 times. Keywords: film coating, nanoagents, chrome plating, properties, wear resistance, new restoration method, equipment.