Abstract
The operation reliability and service life of various heat engineering equipment: turbines, steam generators, heat exchangers, valves and control valves, pumps, etc. largely depends on the degree of wear of the working surfaces of highly loaded machine elements, particularly working blades of steam turbines and compressors of gas turbine engines (GTE) and gas turbine units (GTU).
Highlights
We have developed vacuum-plasma methods of multistage surface pre-treatment, which, as the research results indicate, when combined with optimization of the multilayer structure allow to obtain high-quality firmly bonded coatings
As can be seen from the table 1, the best design of the multilayer protective coating in terms of quality, with regard to adhesion, is the construction provided in para
In ion-plasma cleaning using a high-density gas plasma, generated by gas plasma generator, there is no problem of metal particles deposition on the surface, and the potentials can be changed smoothly for parts starting from zero value
Summary
As can be seen from the table 1, the best design of the multilayer protective coating in terms of quality, with regard to adhesion, is the construction provided in para. In ion-plasma cleaning using a high-density gas plasma, generated by gas plasma generator, there is no problem of metal particles deposition on the surface, and the potentials can be changed smoothly for parts starting from zero value. The mode of arc sources operation was experimentally chosen so that at continuous mode of the arc combustion the temperature of the products would rise from 573–623K to 800–823K while reaching the accelerating potential of 800 V within 8–10 min This made it possible to avoid the intensive creation of micro arcs, which can be caused by increased gas emission due to additional heating of the product surface and equipment during treatment, insufficient degree of pre-cleaning of the equipment and products before the chamber vacuum treatment, etc.
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