X-RAY TOMOGRAPHY OF DEPOSITION QUALITY AND RESEARCH OF THE EFFICIENCY OF DEPOSED REGENERATION COATINGS FOR FIRE MACHINERY AND FIRE EQUIPMENT

Abstract

Today, units of the State Service of Ukraine for Emergency Situations, in the implementation of the state's function of protecting the population, territories and environment from emergencies, work in extremely difficult conditions. To a
large number of fires and emergencies, emergencies caused by russia's armed aggression were added, including collapses of civil, industrial and critical infrastructure buildings, accidents at enterprises of various industries, missile and air strikes, etc. During the round-the-clock work of rescuing victims, extinguishing fires, and eliminating accidents and emergencies, not only rescuers, but also the equipment they work with, work at the limit of their capabilities, and often beyond the limit. The intensity of work leads to wear and tear of parts of firefighting, emergency rescue and engineering machinery and equipment. Also, fire-rescue units of Ukraine often use firefighting equipment, emergency-rescue and engineering
equipment of foreign production, which were provided to Ukraine as part of the aid and support of the world community.
Replacing worn-out parts of machinery and equipment that are currently operating in Ukraine (especially provided by partner countries) is an extremely difficult, long-term and, in some cases, even impossible task. There are methods of
restoring, regenerating and increasing the wear resistance of elements and units of firefighting equipment and equipment with the help of eutectic coatings. Therefore, the development and research of eutectic coatings for the restoration of worn parts of the fire, emergency rescue and engineering machinery and equipment, as well as the regeneration of individual nodes and working bodies, will increase the service life, wear resistance and durability of these types of machinery and equipment, is an urgent task today. The purpose of the work is to study the quality of application of the regenerative eutectic coating of the Fe-Mn-C-B-Si system alloyed with Cr selected based on the results of wear resistance studies on
the working body of emergency and rescue scissors and to determine its effectiveness in the direct operation of the equipment as intended.
The quality of deposition of the regenerative eutectic coating of the Fe-Mn-C-B-Si system doped with Cr, which is characterised by the best wear resistance among the previously studied samples, was investigated. The coating is
characterized by good welding properties. According to the results of computer X-ray tomography, a cavity (bubble) in the coating on the knife with dimensions of 1.155 mm was found. As further studies in operation have shown, this bubble
does not affect the operational characteristics of the knives.
Determining the effectiveness of the regeneration coating from the eutectic alloy of the Fe-Mn-C-B-Si system alloyed with Cr in the direct work as intended consisted in cutting the reinforcing bars of the A-500 brand with a diameter
of 8 mm with knives with applied regeneration coating and knives of serial production and comparing the level of their wear. According to the results of the study, it was established that knives with an applied regeneration coating have a 1.75
times greater service life compared to mass-produced knives. That is, it can be stated that the researched eutectic regeneration coating of the Fe-Mn-C-B-Si system alloyed with Cr is effective for restoring the blades of emergency and
rescue scissors. The use of this regenerative coating on fire equipment and emergency rescue tools requires further research and possible adjustment of the composition of the coating.