Alloy electrode suitable for Cu<2>SnSe<3>-based thermoelectric element and preparation technology of thermoelectric element

Abstract

The invention relates to an alloy electrode matched with a p-type Cu<2>SnSe<3>-based thermoelectric material and a preparation technology of a Cu<2>SnSe<3>-based thermoelectric element. The alloy electrode is a Ti-Ni alloy, and has high electric conductivity and thermal conductivity. The Ti-Ni alloy provided by the invention has a coefficient of thermal expansion, which is very similar to that of the Cu<2>SnSe<3>-based thermoelectric material. According to preparation of the Cu<2>SnSe<3>-based thermoelectric element, the Cu<2>SnSe<3>-based thermoelectric element is formed by directly sintering the Cu<2>SnSe<3>-based thermoelectric material on the Ti-Ni alloy electrode by an (RHPS) technology; and an intermediate transition connection layer is not needed. The sintered electrode interface bonding is very stable; and the Cu<2>SnSe<3> / electrode interface is free of obvious resistance transition. The preparation technology is simple, is very suitable for preparation of the Cu<2>SnSe<3>-based thermoelectric element and can be applied to large-scale production and preparation.

Description

Technical field [0001] The invention belongs to the field of thermoelectric components and their preparation, and particularly relates to 2 SnSe 3 Alloy electrode of base thermoelectric element and suitable for Cu 2 SnSe 3 Preparation process of base thermoelectric element. Background technique [0002] Thermoelectric material is a kind of energy material that can mutually convert heat energy and electric energy. It uses its Seebeck effect to directly convert heat energy into electric energy. Thermoelectric power generation components made of thermoelectric materials do not need mechanical moving parts when working, and they also have a long life. It has the advantages of long, high reliability and no pollution to the environment. It has great potential in the field of aerospace, industrial waste heat recovery and geothermal utilization. In the modern society with increasingly tight energy, the research and development of thermoelectric power generation components has been achieve...

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Problems solved by technology

For example, in the patent document JP11274580, the PbTe thermoelectric material uses Cu electrodes. In the patent document ZL200710037778.X, the skutterudite uses the spark plasma sintering technology (SPS) to prepare the Mo-Cu alloy as the electrode of the skutterudite thermoelectric element, and The thermoelectric element contains an intermediate transition layer Ti layer. The more interfaces, the greater the heat loss and electrical loss, which seriously affects the performance of the thermoelectric element.

[0004] Cu 2 SnSe 3 Based thermoelectric materials have good thermoelectric properties due to their special diamond-like structure, and are considered to be one of the medium-temperature power generation materials with great application prospects. Currently, P-type Cu 2 SnSe 3 The thermoelectric figure of merit (ZT) of the base has reached above 1.0, but the Cu 2 SnSe 3 The preparation technology of the base thermoelectric components is still blank, and the electrode and connection technology of other medium and high temperature thermoelectric materials are not suitable for Cu 2 SnSe 3 Based thermoelectric materials, therefore, the development of a suitable for Cu 2 SnSe 3 Alloy electrodes and connection technology based on thermoelectric materials have broad market prospects

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