Abstract
The process of chemical vapor deposition of Mo and Mo-С coatings was studied by means of thermal decomposition of molybdenum hexacarbonyl. The kinetics of the coating growth in the range of 480 °C–540 °C and the pressure in the reaction volume from 9 Pa to 16 Pa were explored. The dependences of coating growth rate, the magnitudes of their microhardness on the parameters of their obtaining, as well as the changes in the morphology of the coating surface, roughness, and structure, were established. The tribological properties of the obtained coatings coupled with bronze Br.Su3H3S20F0.2 were explored at the friction machine 2070 SMT-1 according to the cube–roller scheme in a load interval of 0.2–1.4 kN. The lubrication during determining the friction coefficients was carried out by immersion of the movable counter body into a bath with fuel TC-1, GOST 10227-86. It was necessary to conduct such research because there is insufficient information when it comes to the specific equipment and peculiarities of the object onto which a coating is applied. When developing the process of coating application on specific components, techniques, and means to ensure the uniformity of parts heating and precursor feeding to their surface were tested. As a result of the conducted studies, we obtained the regions of parameters of obtaining coatings with different structure, rate, hardness, as well as the patterns of changes in these characteristics at the change of the basic parameters of the process of obtaining such coatings. Depending on application conditions, coatings may have hardness from ~11,000 MPa to 18,000 MPa at a growth rate from 50 μm/h to 170 μm/h. The mean values of the friction coefficient of coatings with different microstructure and microhardness were 0.101 at the load of 0.2 kN and 0.077 at the load of 1.4 kN. Based on the conducted research, it was possible to develop the process of applying the metal and metal-carbide molybdenum-based CVD coatings in regards to the components of the assembly and engine construction, which can serve as the basis for the development of industrial technologies
Highlights
The development of technology and its high-tech directions, such as aviation, put forward increasing requirements for products and coatings materials, which often cannot be realized within the application of any single method and demand the combined use of various methods
The first four positions implement the group of plasma vacuum physical methods of surface treatment and coating application (PVD-methods), which are widely used in machine building and other industries
The aim of this study is to develop the chemical vapor deposition process of obtaining molybdenum and molybdenum-carbide coatings for the parts of aviation assembly and engine construction of a complex shape
Summary
The development of technology and its high-tech directions, such as aviation, put forward increasing requirements for products and coatings materials, which often cannot be realized within the application of any single method and demand the combined use of various methods. The first four positions implement the group of plasma vacuum physical methods of surface treatment and coating application (PVD-methods), which are widely used in machine building and other industries Based on these methods, more than 30 modern plasma vacuum technologies were developed and put into mass production at the JSV “FED”. In paper [5], it is noted that the limited use of the chemical vapor deposition methods in engineering is mainly associated with the lack of affordable specialized equipment for the implementation of these methods The existence of such equipment at the JSC “FED” makes it possible to work in the direction of the creation of new technologies of chemical vapor coating application with regard to components of the assembly and engine construction.
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