Self-propagating combustion synthesis method of Sb2Te3-base thermoelectric material and combustion improver thereof

Abstract

The invention discloses a self-propagating combustion synthesis method of a Sb2Te3-base thermoelectric material and a combustion improver thereof. The synthesis method comprises the following step: by using Sb and Te simple substances as raw materials, carrying out self-propagating combustion synthesis reaction under the accelerating action of a combustion improver In simple substance to obtain the Sb2Te3-base thermoelectric material. The invention discloses a combustion improver In simple substance for synthesizing the Sb2Te3-base thermoelectric material by self-propagating combustion for the first time, which can accelerate the self-propagating combustion synthesis reaction of the raw material Sb and Te simple substances to generate the Sb2Te3-base thermoelectric material; and in combination with the discharge plasma sintering, a compact Sb2Te3-base block thermoelectric material can be prepared. The method enhances the pyroelectricity, has the advantages of ultrashort preparation time, simple technique, low facility request, energy saving, environment friendliness and the like, is suitable for large-scale production, and lays favorable foundation for scale-up preparation and large-scale application of the Sb2Te3-base thermoelectric material.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a self-propagating combustion synthesis method of Sb2Te3-based thermoelectric materials and a combustion accelerant. Background technique [0002] Due to the increasingly severe energy shortage and environmental pollution, the research and development of new energy materials and new energy conversion technologies has become a hot spot of widespread concern in the world. Thermoelectric materials are environmentally friendly new energy materials and have broad commercial application prospects in thermoelectric power generation and thermoelectric refrigeration technologies. The conversion efficiency of thermoelectric materials is determined by the dimensionless thermoelectric figure of merit ZT (ZT=α 2 σT / κ (where α is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and T is the absolute temperature),...

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Problems solved by technology

This is due to the preparation of Sb only from elemental powder 2 Te 3 The heat released by the chemical reaction is not enough to promote the propagation and spread of the combustion wave. Even if the combustion reaction has been initiated, the combustion wave will be extinguished during the propagation process and the Sb cannot be obtained through the self-propagating combustion reaction. 2 Te 3

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