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Preparation method of Ca3Co4O9 thermoelectric material

A thermoelectric material and gel method technology, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of thermoelectric materials with few holes, high raw material cost, and inability to achieve, and achieves low cost, improved thermoelectric performance, and improved performance. Effect

Inactive Publication Date: 2016-12-07
GUIZHOU MINZU UNIV
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Problems solved by technology

[0003] The object of the present invention is to: provide a kind of Ca 3 co 4 o 9 Preparation methods of thermoelectric materials to address Ca prepared by existing methods 3 co 4 o 9 Thermoelectric materials have fewer pores, and it is impossible to realize Ca 3 co 4 o 9 The optimal performance of thermoelectric materials is prepared with calcium nitrate and cobalt nitrate as raw materials. The cost of raw materials is high, and there are a lot of nitrogen oxides in the product, which has a problem of serious air pollution.

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  • Preparation method of Ca3Co4O9 thermoelectric material
  • Preparation method of Ca3Co4O9 thermoelectric material

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Embodiment

[0012] Preparation of Ca 3 co 4 o 9 Thermoelectric material: use inorganic acetate as raw material and citric acid as complexing agent to form sol and gel, then pre-calcine to obtain precursor nano-powder, and then sinter it. The process is carried out as follows:

[0013] (1) Add calcium carbonate and cobalt acetate to the reaction vessel according to the stoichiometric ratio, add citric acid, the ratio is calcium carbonate: cobalt acetate: citric acid = 3mol: 4mol: 7.5mol, then add deionized water to dissolve the mixture, and dissolve the mixture Put it on a magnetic stirrer to heat and stir, and set the stirring speed at 90 rpm. While stirring, gradually increase the temperature from room temperature to 115°C until the solution turns into a purple-red xerogel;

[0014] (2) Grind the xerogel obtained in step (1) and pre-calcine at 350°C to remove the citric acid in it, and sinter the obtained powder at 800°C to obtain Ca 3 co 4 o 9 .

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Abstract

The invention provides a preparation method of a Ca3Co4O9 thermoelectric material. The method comprises the following steps: forming a sol and a gel from acetates by using citric acid as a complexing agent by a sol-gel process, presintering to obtain precursor nano powder, and sintering. The Ca3Co4O9 thermoelectric material prepared by the existing process has fewer pores, and can not implement the optimal properties of the Ca3Co4O9 thermoelectric material; and the calcium nitrate and cobalt nitrate are used as raw materials for preparation, so the raw material cost is higher, and the product has abundant oxynitrides which can cause the problem of heavy air pollution. The method belongs to the field of preparation of calcium-cobalt-base oxide thermoelectric materials.

Description

technical field [0001] The invention relates to a method for preparing thermoelectric materials, belonging to the field of preparation of calcium-cobalt-based oxide thermoelectric materials. Background technique [0002] In recent years, with the destructive effect of Freon on the environment and the reuse of waste heat have been widely recognized, thermoelectric materials have received extensive attention and research. The thermoelectric effect can realize mutual conversion of heat and electricity. Currently, Ca 3 co 4 o 9 Due to their good thermal stability, thermoelectric materials can work for a long time in a high-temperature oxidizing atmosphere, and are non-toxic and non-polluting. Therefore, they have great application potential in the field of industrial waste heat reuse and are one of the current research hotspots. At this stage, Ca 3 co 4 o 9 The preparation method of thermoelectric materials is mainly the sol-gel method, which uses calcium nitrate and coba...

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Application Information

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IPC IPC(8): C04B38/00C04B35/01
CPCC04B35/01C04B38/0045C04B2235/3208C04B2235/3275
Inventor 罗姣莲
Owner GUIZHOU MINZU UNIV
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