Study of Electric Spark Coatings Properties Obtained by Electrodes from Titanium Electroerosive Particles

Purpose of reseach. Modern car is a very complex system which has about 15... 20 thousand parts. More than 7 thousand lose their initial characteristics during operational process. As practice shows, more than 4000 car parts lose their operability much earlier than the expiration of vehicle life as a whole. These factors lead to significant repair costs, as well as profit losses caused by long delays in part of the rolling stock. Efficiency and qualitative improvement growth of various areas of public production pose new and more complex tasks to increase the efficiency and reliability of parts. These tasks can be solved both by creating special innovative materials and by developing and introducing into production the latest methods of car parts strengthening and applying protective coatings. Electric spark alloying of metal surfaces is one of these methods. Electric spark alloying is widespread in most industries, including automotive manufacturing, mechanical engineering and metalworking. Electric spark alloying method provides high degree of adhesion, high efficiency and low energy consumption. Electrodes with nano particles are of greatest interest. The most promising method is electroerosive dispersion used in the production of nano materials. The purpose of the work is to study coatings' properties obtained by electric spark alloying using powder electrodes made from electroerosive particles obtained in distilled water from titanium alloy wastes of grade ВТ6.

Methods. ВТ6 grade chips were used to prepare titanium powder by electroerosive dispersion. Consolidation of the particles received by electroerosive dispersion of BT6 titanic alloy waste is done by spark plasma agglomeration method with the use of spark plasma agglomeration system of SPS 25-10. UR-121 installation was used to cover electrospark coverings. Experimental pictures on QUANTA 600 FEG raster (scanning) electronic microscope were made to study coverings' form and morphology. X-ray spectrum analysis was performed by EDAX 's energy dispersion X-ray analyzer built into QUANTA 600 FEG raster electron microscope. Surface roughness of samples was examined on SURTRONIC 25 profilometer.

Results. It was experimentally stated that titanium, oxygen, aluminium and tungsten are the main elements in the sintered sample of titanium particles obtained in distilled water. It was stated as a result of properties investigation of powder electrodes from electroerosive particles and coatings obtained by electrospark alloying. Other elements are present in minor amounts. Roughness of electric spark coated samples is Rz 13.2 um (Ra 2.14 um). These particles obtained in water distilled from ВТ6 titanium alloy waste can be used for electrodes suitable for automotive parts recovering by electric spark alloying.

Conclusion. Obtained results can be used in creation of resource-saving processes of metal alloys and composite materials. 

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