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Microwave sintering synthesis method of oxide thermoelectric material Ca3-xKxCo4O9

A technology of ca3-xkxco4o9 and thermoelectric materials, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of high energy consumption, long cycle, unfavorable mass production of thermoelectric materials, etc., and achieve simple operation, The effect of low cost and outstanding thermoelectric performance

Active Publication Date: 2015-05-06
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method has a long cycle and high energy consumption, which is not conducive to large-scale mass production of thermoelectric materials

Method used

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  • Microwave sintering synthesis method of oxide thermoelectric material Ca3-xKxCo4O9
  • Microwave sintering synthesis method of oxide thermoelectric material Ca3-xKxCo4O9
  • Microwave sintering synthesis method of oxide thermoelectric material Ca3-xKxCo4O9

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Embodiment 1

[0018] Oxide thermoelectric material Ca 3-x K x co 4 o 9 The microwave sintering synthesis method, wherein 0﹤x≤0.35, is completed according to the following steps:

[0019] (1), first put the analytical reagent CaCO 3 、K 2 CO 3 、Co 2 o 3 Press Ca 3-x K x co 4 o 9 Weigh the stoichiometric molar ratio of Ca:K:Co=3-x:x:4. After grinding, put the ground powder in an alumina crucible, then place it in a box furnace, and heat it to a constant temperature of 850°C After pre-burning for 24 hours, cool down to room temperature with the furnace and take it out;

[0020] (2) The pre-fired powder is ground for the second time and then pressed into a disc. The double crucible is used to hold the tablet, and then the double crucible is placed in a household flat-panel microwave oven, heated at 400W for 15 minutes and then cooled with the furnace. To room temperature, take out the compressed tablet to obtain the target product. Wherein, the double-crucible holding tablet is ope...

Embodiment 2

[0026] The difference from Example 1: In step (1), pre-fire at a constant temperature of 820° C. for 30 hours.

Embodiment 3

[0028] The difference from Example 1; in step (1), pre-fire at a constant temperature of 880°C for 20h; in step (2), heat at 640W for 10min.

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Abstract

The invention belongs to the technical field of preparation of thermoelectric materials and particularly relates to a microwave sintering synthesis method of an oxide thermoelectric material Ca3-xKxCo4O9. The microwave sintering synthesis method comprises the following steps of (1), firstly weighting CaCO3, K2CO3 and Co2O3 according to stoichiometric molar ratio in Ca3-xKxCo4O9, grinding, placing ground powder in a crucible, placing the crucible in a sintering furnace, heating to 820-880 DEG C, pre-sintering for 20-30 hours at a constant temperature, cooling to room temperature in the furnace and taking out; and (2) carrying out second grinding on pre-sintered powder, pressing to sheets, holding the sheets in a double crucible, placing the double crucible in a flattening microwave oven, heating the double crucible for 10-15 minutes at a power of 400-640W, cooling the double crucible to room temperature in the furnace, taking out and pressing into sheets to obtain the target product. The method is simple in operation, the reaction raw materials during the reaction are solid, the chemical components of a reaction product is easy to control, the reaction time is short, the cost is low and the large-scale batch production of the material is facilitated; and the thermoelectric parameter power factor of the product prepared by the method is higher than that of the product prepared by virtue of a high-temperature-furnace sintering method and the thermoelectric performance is more prominent.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, in particular to an oxide thermoelectric material Ca 3-x K x co 4 o 9 Microwave sintering synthesis method. Background technique [0002] Thermoelectric materials are functional materials that can convert heat and electricity. Ca 3 co 4 o 9 It is an oxide thermoelectric material with broad application prospects, and the thermoelectric performance of the material can be significantly improved by doping K at the Ca site. Current Ca 3-x K x co 4 o 9 The preparation of is usually carried out in a high-temperature furnace (Journal of the Korean Physical Society, Vol. 57, 2010, pp. 1054-1058). In this method, the sample needs to be kept at around 900oC for 48 hours and then cooled with the furnace before it can be obtained. This preparation method has a long period and high energy consumption, which is not conducive to large-scale mass production of thermoelectri...

Claims

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Application Information

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IPC IPC(8): C01G51/00
Inventor 郭娟卢喜凤郜超军张腊花宋红章贾建峰胡行
Owner ZHENGZHOU UNIV
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