Cubic-phase Ca2Si thermoelectric material and preparation method thereof

The invention discloses a cubic-phase Ca2Si thermoelectric material and a preparation method thereof. The method comprises the following steps that 1, Ca powder and Si power are mixed to be uniform in an Ar protective atmosphere, and a mixture is obtained; 2, the mixture, a grinding ball, a stainless steel ball grinding tank and electronic scales are put into a glove box inflated with an atmosphere of Ar, after accurate weighing is conducted in the glove box, the mixture is put into the ball grinding tank, the ball grinding tank is well sealed, oxygen is prevented from entering the ball grinding tank, and then the ball grinding tank is taken out of the glove box; 3, the well-prepared ball grinding tank in the second step is put into a ball grinder, ball grinding is conducted at a certain rotating speed, and the powder reacts completely; 4, the well reacted powder in the third step is taken out and put into a stainless steel mold with a required specification, vacuum-sintering tabletting is conducted by means