Severina S. Development of Nickel-Based Alloys for Prosthodontics for the Enhancement of Organism Tolerance and Methods of Heat Treatment

The dissertation is devoted the development of national nickel-based alloys for prosthodontics. The distinctive feature of the elaborated alloys is the new complex composition of alloying elements in comparison with the best samples of foreign ones for prosthodontics. On the ground of analysis the binary phase diagrams of nickel-chromium, iron, titanium, aluminum, silicon, tungsten, niobium and molybdenum, the effect coefficients of these s alloying elements on the solidus and liquidus temperatures of alloys based on nickel are determined. The problem of minimizing the crystallization of developed alloys is solved by the variation method of the concentration intervals of alloying elements. Constructed casting dental alloys satisfy the conditions for thin-walled casts of complex shape molded structures for dentures. It was shown that, the homogeneous structure on the surface of dental alloys by scanning laser remelting method can improve the corrosion resistance and surface hardness of dental castings by reducing macroheterogeneity.