Method for producing a thermoelectric object for a thermoelectric conversion device

摘要

A method for producing a thermoelectric object for a thermoelectric conversion device is provided. A starting material which contains elements in the ratio of a half-Heusler alloy is melted and then cast form an ingot. The ingot is heat-treated for 12 to 24 hours at a temperature of 1000° C. to 1200° C. The homogenised ingot is crushed and ground to provide a powder. The powder is cold-pressed and sintered for 0.5 to 24 hours at a temperature of 1000° C. to 1500° C.

主权项

1. A method for producing a thermoelectric object for a thermoelectric conversion device, comprising:
providing a starting material which comprises elements in the ratio of a half-Heusler alloy described by the formula αβχ, wherein a is one or more of the elements of the group consisting of Ti, Zr and Hf, β is Co or Ni and χ is Sn or Sb or both, the composition being described by ZraHfbTicNiSn1-dSbd or ZraHfbTic, CoSb1-eSne, wherein 0≦a≦0.8, 0≦b≦0.8, 0≦c≦0.8, 0≦d≦0.1 and 0≦e≦0.3 and the sum (a+b+c)=1, melting the starting material, followed by casting an ingot, heat treating the ingot for 12 to 24 hours at a temperature of 1000° C. to 1200° C. in order to produce a homogenised ingot, crushing the homogenised ingot, grinding the crushed ingot, whereby a powder is produced, cold pressing the powder, whereby a green body is produced, sintering the green body 0.5 to 24 hours at a temperature of 1000° C. to 1500° C., and producing a thermoelectric object.