Method for preparing Cu2Se thermoelectric material by low-temperature solid-phase reaction

Abstract

The invention relates to a method for preparing a Cu2Se thermoelectric material. The method for preparing the Cu2Se thermoelectric material by the low-temperature solid-phase reaction is characterized by comprising the following step: 1) weighing Cu powder and Se powder according to the molar ratio of 2:1 and mixing the Cu powder and the Se powder uniformly to obtain mixed powder, wherein the Cu powder and the Se powder serve as raw materials; 2) pressing the mixed powder into a block body by using tablet press, placing the block body into a graphite crucible, vacuumizing, sealing into a quartz glass tube, placing into a muffle furnace, performing solid-phase reaction at the temperature of between 650 and 750 DEG C for 12 to 24 hours, and grinding the obtained product into powder; and 3) performing spark plasma sintering on the powder obtained in the step 2) to obtain a compact block body, namely the Cu2Se thermoelectric material. By the method, the raw materials have low cost; the reaction temperature is low; energy is saved; and the materials are fed according to the stoichiometric ratio of the Cu2Se, so the product composition can be controlled precisely; and the repeatability is high.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to a Cu 2 Preparation method of Se thermoelectric material. Background technique [0002] In the past ten years, with the rapid population expansion and rapid industrial development, energy and environmental problems have gradually become prominent. The energy crisis and environmental crisis marked by the soaring crude oil price, excessive greenhouse gas emissions and the hole in the ozone layer have attracted increasing attention. At present, traditional energy sources such as oil, coal, and natural gas cannot meet the requirements of social and economic development. In this context, finding and developing new energy sources and new energy materials has become a research hotspot for scientists around the world. Thermoelectric materials can directly convert thermal energy into electrical energy. As an environmentally friendly material, it has important application prospects in ...

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Problems solved by technology

[0004] Currently Cu 2 The synthesis of Se-based thermoelectric materials mainly adopts the melting method, but due to the existence of high-melting Cu simple substance in the reaction raw materials, the reaction temperature of the melting method is generally higher, higher than 1000 ° C, and the boiling point of Se is less than 700 ° C, resulting in the formation of Se in the reaction process. The volatilization loss is serious, and it is difficult to accurately control the content of Se in the product. Therefore, the repeatability of the melting method is not good, and the equipment requirements are high. performance optimization

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