Abstract
The paper discusses the peculiarities of a structure and a coating composition after reflow. It was established that the structure of coatings from nickel alloy is a solid solution based on nickel, the eutectic of γ-Ni+Ni3B composition and dispersed reinforcing particles. The content of alloying elements in the initial powder material determines the type of the coating structure and the formation of hypoeutectic or hypereutectic structures. The influence of formation conditions on the structure and physical-mechanical properties of the coatings is considered in this paper.
Highlights
At present the plants both in Russia and abroad use alloys for the production of wear- and corrosionresistant coatings by surfacing or spraying with subsequent melting
In the initial condition, the powder materials of nickel alloys have a structure consisting of disperse grains of the solid solution based on nickel, a fine branched eutectic of the solid solution based on nickel Ni3B, fine primary carbides of chromium and boron, and borides of nickel and chromium [2,3,4,5,6,7]
The results show that an increase in the content of alloying elements in the alloy increases the content of the eutectic and hardening phases and the hardness of the gamma solid solution based on nickel as well as the hardness of the entire coating (Figure 1, Table 1)
Summary
At present the plants both in Russia and abroad use alloys for the production of wear- and corrosionresistant coatings by surfacing or spraying with subsequent melting. Investigations were carried out into the effect of the main parameters of the process of melting materials produced from nickel alloys of the Ni- Cr-B-Si system (heating temperature and holding time) on the formation of the structure of coatings.
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