Purpose. To increase the durability and reliability of working elements of equipment operating under impact and abrasive wear.
Specifications. Wear- and impact-resistant coatings are formed by electric arc surfacing with powder strip at a direct current of 150-180 A of reverse polarity, manually or automatically in a horizontal position. The power sources for the process are serial welding rectifiers of the VDU-506 type. The maximum thickness of coatings for multilayer surfacing is 10–15 mm. Mechanical processing of deposited layers is carried out exclusively with abrasive tools. The hardness of the coatings is 62–65 HRC, and their relative wear resistance during abrasive and impact-abrasive wear compared to serial T590 electrodes is 1.5 and 1.8, respectively.
Application area. The developed technology can be proposed to increase the durability of equipment parts and tools used in the energy (thermal and recovery energy), oil and gas, mining and metallurgical, processing (processing of plastic and other waste), transport (road repair vehicles) and be used both in the stage of strengthening new parts and the stage of repair work.
Advantages. The technology proposed based on the research results is characterized by flexibility and versatility compared to serial technologies, since it can significantly increase both abrasive and impact-abrasive wear resistance, while existing technologies for surfacing with high-chromium, high-tungsten materials and analogues of high-alloy steels can significantly increase only one of the characteristics.
Technical and economic effect. The use of the proposed technology makes it possible to increase the durability of a number of wear parts operating in an abrasive environment under the influence of cyclic or sign loads; in particular, the durability of press screws for the production of building ceramics after surfacing increases by 1.9–2.0 times compared to welded electrodes. , punches for the production of fuel briquettes from wood biomass and cutter knives – by ~2.5 times, compared with welded T590 electrodes, large-sized cast parts of grinding units (rotors and armor) from high-manganese steels – by 1.5 – 2.0 , road milling cutters – 1.8 – 2.0 times. In each individual case, the technical and economic effect is achieved both by increasing the time between repairs and by the possibility of carrying out multiple restorations.
Description. The technology involves wear-resistant surfacing of the surfaces of steel parts using powder strips containing reaction mixtures of refractory metal powders (Mo, Ti, Nb, V) with boron carbide. The technology is based on the production of a matrix-reinforced structure of the deposited surface layer, where the role of the reinforcing phase is played for the first time by complex Fe-Mo borides.