Thermoelectric materials synthesized by self-propagating high temperature synthesis process and methods thereof

Patent metadata

Field	Value
Publication number	US-11433456-B2
Application number	US-201916667180-A
Country	US
Kind code	B2
Filing date	Oct 29, 2019
Priority date	Mar 19, 2013
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

The disclosure relates to thermoelectric materials prepared by self-propagating high temperature synthesis (SHS) process combining with Plasma activated sintering and methods for preparing thereof. More specifically, the present disclosure relates to the new criterion for combustion synthesis and the method for preparing the thermoelectric materials which meet the new criterion.

First claim

We claim:

1. A synthesis method for preparing Half-Heusler thermoelectric materials, comprising
(1) preparing appropriate amounts of single elemental powders A, B and X in a 1:1:1 stoichiometric ratio, mixing the powders in an agate mortar and then cold-pressing into a pellet,
(2) sealing the pellet in a silica tube under a pressure of 10 −3 Pa,
(3) initiating a synthesis by point-heating a small part of the pellet,
(4) cooling down the pellet to room temperature in air or quenching the pellet in salt water,
(5) crushing the pellet into fine powder, and
(6) sintering the fine powder by plasma activated sintering (PAS).

2. The synthesis method according to claim 1 , wherein A is an element selected from elements in IIIB, IVB, and VB columns of the periodic table; B is an element selected from elements in VIIIB column of the periodic table; X is an element selected from elements in IIIA, IVA, VA columns of the periodic table; and the sintering is performed with a temperature above 850° C. and a pressure from about 30 MPa to about 50 MPa.

3. The synthesis method according to claim 1 , wherein element A is selected from one of the following: Ti, Zr, Hf, Sc, Y, La, V, Nb, and Ta; element B is selected from one of the following: Fe, Co, Ni, Ru, Rh, Pd, and Pt; and X is selected from one of the following: Sn, Sb, and Bi.

Assignees

• Univ Wuhan Tech

Inventors

• Tang Xinfeng
• Su Xianli
• Zhang Qiang
• Cheng Xin
• Yang Dongwang
• Zheng Gang
• Fu Fan
• Liang Tao
• Zhang Qingjie

Classifications

• C22C9/00

  Alloys based on copper · CPC title

• B22F3/23 Primary

  involving a self-propagating high-temperature synthesis or reaction sintering step {(making cermets by reaction sintering C22C1/051)} · CPC title

• C22C11/00

  Alloys based on lead · CPC title

• C22C23/00

  Alloys based on magnesium · CPC title

• C22C29/12

  based on oxides · CPC title