METHOD FOR OBTAINING THERMOELECTRIC MATERIAL OF n-TYPE BASED ON MgSiSn TRIPLE SOLID SOLUTIONS Russian patent published in 2014 - IPC B22F3/23 H01L35/20 

FIELD: metallurgy.

SUBSTANCE: invention refers to metal powder industry, in particular to production of thermoelectric materials of n-type conductivity based on Mg₂Si_1-xSn_x triple solid solution. It may be used for production of medium temperature thermoelectric generators of renewable energy operating in temperature range of 300÷600°C. Mixture of powder of base components and dope additives with controlled size of particles and balls of high-energy mill are loaded in container at ratio of balls mass to base components powder mixture equal to (10÷20):1, then loaded containers are cooled to liquid nitrogen temperature, cooled containers are installed on ball mill, and mechanochemical synthesis is conducted with loaded containers rotation speed of 900÷1200 rpm for 8÷10 min. Containers are cooled to liquid nitrogen temperature, ball mill is installed again, and material is treated in high-energy ball mill in the same modes. Obtained powder material is compacted to a workpiece by pressing at room temperature under pressure of 100÷50 MPa for 2÷3 min, then the workpiece is heated in spark plasma sintering plant (speed of 150÷200°C/min to temperature of 680÷780°C under pressure of 50÷80 MPa in vacuum, it is exposed for 10-15 min and cooled to room temperature with cooling speed of 30÷50°C/min.

EFFECT: obtaining composite materials with high and reproducible thermoelectric efficiency at temperature of not less than 750 K.

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