M1-xAx/Ni1-yBy/Snz-1Cz-BASED HALF-HEUSLER TYPE THERMOELECTRIC MATERIAL FOR HIGH TEMPERATURE AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an M_1-xA_x/Ni_1-yB_y/Sn_z-1C_z-based half-Heusler type thermoelectric material for high temperature that has a performance suitable for general uses, and its manufacturing method.;SOLUTION: The M_1-xA_x/Ni_1-yB_y/Sn_z-1C_z-based half-Heusler type thermoelectric material for high temperature is a thermoelectric material wherein a part of an M_1-x site and Ni_1-y is replaced with A_x and B_y elements with a large difference in atomic weight and a part of an Sn_z-1 is replaced with another element C_z in the same manner, and their composition ratio is optimized so that the electrical characteristics of the thermoelectric material can be improved. In the manufacturing method thereof, a material having a specified composition ratio is solid-solution alloyed by arc-melting for example, and then the obtained ingot is crushed and refined. Then, the crushed and refined alloy powder is sintered into a thermoelectric material with an optional diameter by hot pressing for example, and it is subjected to heat treatment to uniformly distribute the contained elements.;COPYRIGHT: (C)2005,JPO&NCIPI