Water cooling copper crucible directional freezing method for superhigh-temperature Nb-Si alloy

The invention relates to a water cooling copper crucible directional freezing method for a superhigh-temperature Nb-Si alloy, relates to a metal directional freezing method, in particular to a directional freezing method for the superhigh-temperature Nb-Si alloy, and aims at solving the problems of the existing directional freezing method that the metal is easy to be contaminated, the directional freezing efficiency is low, the structure form is not easy to adjust and the comprehensive mechanical property of the alloy is poor. The directional freezing method comprises the following main steps that 1. the interior of a furnace is provided with a loading rod and backing material, a water cooling copper crucible is arranged outside of the loading rod and the backing material, and an induction coil is arranged outside of the water cooling copper crucible; 2. the furnace is vaccumized firstly and then argon is introduced; 3. after the loading rod and the backing material are sent into the induction range of the induction coil, and single-phase alternating current is introduced to the induction coil so as to move the loading rod and the backing material downwards; and 4. when the material transmitting rod is moved downward and reaches the preset length, the material transmitting rod stops moving downward and the power applied to the induction coil is stopped. The method is applicable to preparing the superhigh-temperature Nb-Si alloy.