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Advanced Monocrystals Growth in Microgravity

Michael Shoikhedbrod


Under terrestrial conditions, gravitational forces prevent the production of materials that are
homogeneous in distribution of components and phases. Strong thermo gravitational unsteady
convection leads to instability of crystal growth parameters and limits the possibility of production of
the crystals with a high degree of homogeneity and structures with ideal parity. The first results of
crystal growth under microgravity conditions showed the fundamental possibility of production more
perfect crystals due to the absence of gravitational convection. However, under conditions of
microgravity in melts new opportunities for convective processes of a non-gravitational type -
Marangoni convection, as well as (in the presence of residual gravity) small thermo gravitational
processes appear with a decrease in the level of gravity, which leads to the problem of ideally
homogeneous crystals production. Another problem is the presence, in contrast to terrestrial
conditions, of gas inclusions in melts and crystalline solutions, which also leads to the impossibility of
ideally homogeneous crystals production. The article presents new developed method for advanced
monocrystals growth in microgravity with help of a solution of this problem through the use of
controlled vibration in vibroturbulization process mode for degassing of melts and crystalline
solutions, mixing of their components during the advanced monocrystals growth in the space flight.

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