Application of fluoride refractories to obtain functional alloys containing chemically active components Ti, Zr, Hf, Nb, V

Refractory crucibles, cups and other products made of material based on alkaline earth metals fluorides, which are used for casting, isothermal melting, high-temperature homogenization of chemically aggressive alloys containing a large amount of Ti, Zr, Hf, V, Nb, have been developed and manufactured. However, due to the large difference in coefficients of thermal linear expansion (KTLE) of fluorides and metals, mechanical compression of the crystallizing alloy in the crucible occurs.Such a difference in KTLE leads to cracking and destruction of crucibles. Crucibles that can be disassembled into several parts have been developed. This makes it possible to use such crucibles a large number of times for high-temperature homogenization and melting of chemically active alloys containing Ti, Zr, V, Nb.The developed refractory and special cups made from it also provide new opportunities for scientific research: studying the capillary characteristics (surface tension) of metal melts with a high content of reactive metals, which was previously practically impossible, as well as determining thermodynamic properties (enthalpy of mixing and formation of alloys, activity of components) for these alloys. Keywords: functional metal materials, refractory materials, fluorides of alkaline earth metals, collapsible crucibles, chemically aggressive metals.