Stressless zone-melting method with self-reflected heating equipment

When binary or ternary bismuth telluride alloy is in the process of condensation and crystallization, a radial temperature gradient yields a multicircular internal stress distribution, which is the main reason for initiating the breakage of the ingot and cutting column element. Setting up the radial isothermal layer and a reasonable axial temperature gradient is beneficial for the homogenous growth of bismuth telluride alloy and preventing destructive stress formation during the ingot zone-melting process. By combining the IR reflection tube and special narrow melting zone heating furnace together, we build up an auxiliary temperature field for the ingot micro organizational homogenous formation. This combination contributes to the improvement of the material intensity and thermoelectricity.