Preparation method of SrTiO3/TiO2 composite thermoelectric ceramic material

A ceramic material and thermoelectric technology, applied in the field of thermoelectric ceramics, can solve the problems of high sintering temperature and low thermoelectric performance of oxide-based thermoelectric materials, and achieve the effect of improving sintering performance and strong formability

Inactive Publication Date: 2014-12-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the invention is in order to solve existing SrTiO 3 Based on the problems of low thermoelectric performance and high sintering temperature of oxide-based thermoelectric materials, SrTiO 3 / TiO 2 Preparation method of composite thermoelectric ceramic material

Method used

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  • Preparation method of SrTiO3/TiO2 composite thermoelectric ceramic material
  • Preparation method of SrTiO3/TiO2 composite thermoelectric ceramic material
  • Preparation method of SrTiO3/TiO2 composite thermoelectric ceramic material

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specific Embodiment approach 1

[0025] Specific embodiment one: this embodiment SrTiO 3 / TiO 2 The preparation method of composite thermoelectric ceramic material is implemented according to the following steps:

[0026] 1. Put K 2 CO 3 And TiO 2 After the powder is uniformly mixed, distilled water is added and stirred into a viscous mixture. The mixture is placed on a platinum sheet to form, and after drying, it is sent to a muffle furnace and kept at a temperature of 950-1100°C for 1-100h, and then taken out and cooled in the air. K 2 Ti 4 O 9 Fiber, then K 2 Ti 4 O 9 The fiber is put into distilled water while adding hydrochloric acid for pickling while stirring, the fiber is filtered out and washed with distilled water until the filtrate is neutral, and finally dried to obtain hydrated titanium dioxide fiber;

[0027] Second, the Sr(NO 3 ) 2 Dissolve in deionized water to obtain Sr(NO 3 ) 2 Solution, to Sr(NO 3 ) 2 Add the hydrated titanium dioxide fiber obtained in step one to the solution, disperse uniformly...

specific Embodiment approach 2

[0030] The second embodiment: The difference between this embodiment and the first embodiment is that the massage ratio of step one is 1:3. 2 CO 3 And TiO 2 mixing. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the step one is dried and then sent to the muffle furnace at a temperature of 950-1100°C for 1-100h, wherein the drying temperature is 70-90°C. Other steps and parameters are the same as those in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a SrTiO3 / TiO2 composite thermoelectric ceramic material and belongs to the field of thermoelectric ceramics. The preparation method is used for solving the problems that the thermoelectric performance of the existing SrTiO3 oxide is not high and the sintering temperature is high. The preparation method comprises the steps: firstly, preparing hydrated titanium dioxide fiber; secondly, adding the hydrated titanium dioxide fiber obtained in the step 1 into an Sr(NO3)2 solution, carrying out uniform ultrasonic dispersing, adjusting the pH value of the system to be 8-12 and then carrying out hydrothermal reaction and drying to obtain a composite fiber; and thirdly, carrying out compression molding on the composite fiber and carrying out anaerobic sintering at a temperature of 1100 DEG C-1300 DEG C to obtain the SrTiO3 / TiO2 composite thermoelectric ceramic material. According the preparation method disclosed by the invention, by virtue of doping rare earth elements, the conductivity of the composite thermoelectric ceramic material can be improved. By virtue of preparing the SrTiO3 / TiO2 composite fiber, the ZT value of the SrTiO3-based material is improved to 0.1-0.35 and the sintering temperature is effectively reduced.

Description

Technical field [0001] The invention belongs to the field of thermoelectric ceramics, and specifically relates to a preparation method of a fibrous composite oxide thermoelectric material. Background technique [0002] With the strengthening of people's awareness of environmental protection and the transformation of traditional energy concepts, finding a high-efficiency and pollution-free energy conversion method has become an urgent problem in today's energy science. Thermoelectric material (also called thermoelectric material) is a new energy material that uses the movement of carriers inside a solid to realize the direct mutual conversion of heat and electric energy. A generator or refrigerator made of thermoelectric materials is noise-free and wear-free during operation. , High reliability, no pollution, long service life, stable performance, etc., which are of great significance to the development of new energy sources and environmental protection. [0003] The performance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46C04B35/47C04B35/622
Inventor 宋英韩娇孙秋王福平
Owner HARBIN INST OF TECH
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