Abstract
The article deals with the problem of improving the wear resistance and corrosion resistance of machine parts, which is essential for the equipment operation at high speeds and loads. The main purpose of the research was to study ceramic composite materials, which are highly resistant to the intensive wear and adverse environment. It has been established that these requirements are met by ceramic composites based on silicon carbide and aluminum oxide, which have high levels of physical and mechanical properties while being inexpensive and common materials. The selected component of the composite wear-resistant coating for detonation-sprayed coatings was the SiC-Al 2 O 3 ceramic structure, previously tested as a compact ceramic material with a high level of tribotechnical characteristics. It is definite that the strengthening carbide phase of an active interaction with single-component melts takes place with silicide formation under hot pressing. During the charge agglomeration to apply the coating, the SiC-Al 2 O 3 ceramic phase becomes ground as being more friable, but the artificially introduced metal component is plastically deformed without changing the size. The study has revealed a positive effect on the process of applying and the structure of composite detonation-sprayed coatings of the system (SiC-Al 2 O 3 )-Fe produced by an external constant magnetic field, which improves the coating porosity 1.5 times and enhances the coating adhesion 5 times. Moreover, a constant magnetic field in the process of applying the coating significantly decreases the coating porosity. The research results can be applied by experts in the fields of tribology, materials specialists, and experts in the field of operating and maintaining technical systems.
Highlights
The problem of improving the durability and corrosion resistance of machine parts is topical for the equipment functioning at high speeds and loads
Ceramic composite materials of high wear resistance are very promising in such working conditions
The first factor is a significant chemical activity of silicon carbide in metal melts with an instant silicide and free carbon formations: they are released in the form of flaky graphite inclusions, it adversely affects the integrity of the coating
Summary
The problem of improving the durability and corrosion resistance of machine parts is topical for the equipment functioning at high speeds and loads. Ceramic composite materials of high wear resistance are very promising in such working conditions. These materials are resistant to effects of aggressive environments. Such requirements are met by ceramic composites based on silicon carbide and aluminum oxide, which have high physical and mechanical properties and are inexpensive and nonscarce materials. An important advantage of using composite coatings is obvious due to a great complexity of modern machine parts and a large range of materials for their production: the use of expensive composite ceramics locally in the form of a surface coating is significantly economical, and it allows a flexible use of surface and bulk properties of the parts
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