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Application of pyroelectric material

A technology of pyroelectric and ceramic materials, applied in applications, electrical components, household appliances, etc., can solve the problems of pyroelectric materials containing lead and unable to carry out intelligent management

Active Publication Date: 2020-08-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Utilizing the characteristic that the magnetism of magnetic phase change alloys changes with temperature, the material can obtain repeated temperature fluctuations, and the peak voltage can reach 2.3V, but its use requires access to heat sources, and only single heat energy can be obtained. Pyroelectric materials contain lead , is poisonous, and can only obtain heat energy alone, and cannot be intelligently managed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation and application of non-oriented porous zirconium barium perotitanate ceramic material,

[0047] Use analytical grade (Sigma Aldrich) BaCO 3 (99%), CaCO 3 (99%), TiO 2 (99.9%) and ZrO2 (99%) as raw materials, weighed according to the stoichiometric ratio; after ball milling the weighed material for 4h, mix well; the mixture was calcined at 1200°C for 3h, and then additionally ball milled for 24 hours;

[0048] Mix the ground mixture powder with ethanol for 12 hours, and divide it into 5 parts, add different contents of pore-forming agent corn starch, and then mix them with 1wt.% PVA binder; after drying, the powder is subjected to uniaxial Cold pressing to form pellets with a diameter of 13 mm and a thickness of 1.5 mm; the cold pressing pellets are first heated to 600 ° C for 3 h to remove organic additives, and then sintered at 1400 ° C for 4 h to obtain the final five porous zirconium barium perotitanate ceramics material samples;

[0049] Wherein, whe...

Embodiment 2

[0061] Add BCZT ceramic powder (with an average particle size of 0.6 microns) to 5 parts of water with different contents, mix polyvinyl alcohol and ammonium polyacrylate to obtain 5 parts of suspension, place the suspension in molds respectively, and then place the mold in Carry out directional freezing in a liquid nitrogen environment, wherein the temperature of the cold end is -100°C, the temperature of the hot end is 6°C, and the freezing rate is controlled to be 3°C / min; the ice blank formed by directional freezing is dried, and the dried- 60°C, pressure 3Pa

[0062] To obtain a green body with oriented pores, the green body was first heated to 600° C. for 3 hours, and then heated to 1400° C. for 4 hours for calcination, and 5 parts of porous zirconium barium perotitanate ceramic materials were obtained.

[0063] Among them, the BCZT ceramic powder is unidirectionally pressed and sintered to obtain a dense barium zirconium perotitanate ceramic material with a porosity of ...

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Abstract

The invention discloses application of a pyroelectric material. The pyroelectric material is used for collecting heat energy, the heat energy is converted into electric energy by utilizing temperaturechange, and the pyroelectric material is a porous zirconium calcium barium titanate ceramic material; the temperature change is greater than or equal to 1 DEG C; and the porosity of the porous bariumcalcium zirconate titanate ceramic material is 10-60%. The porous zirconium-calcium-barium titanate ceramic material is applied to heat energy collection for the first time, the inventor finds that the porous barium calcium zirconate titanate can be used as the pyroelectric material, and the working principle is as follows: when the environment temperature changes, the pyroelectric material has apyroelectric effect and generates voltage on the upper and lower surfaces of the material, and the heat energy is converted into the electric energy. The porous barium calcium zirconate titanate serves as the pyroelectric material to be used for heat energy collection, the condition for converting the heat energy into the electric energy is that the temperature fluctuation is larger than or equalto 1 DEG C, that is, heat energy collection can be achieved only through temperature fluctuation of 1 DEG C, and the heat energy collection efficiency is greatly improved compared with a thermoelectric material in the prior art.

Description

technical field [0001] The invention belongs to the field of heat energy collection, and in particular relates to the application of a pyroelectric material. Background technique [0002] Low-temperature thermal energy refers to thermal energy with a relatively low grade. Generally, the temperature is lower than 200°C. There are many types of these energy sources, including solar thermal energy, various industrial waste heat, geothermal, ocean temperature difference and other renewable energy sources; the total amount is huge, taking industrial waste heat as an example According to statistics, 50% of the heat energy used by human beings is finally discharged directly in the form of low-grade waste heat. With the development of my country's economy, the contradictions between energy production and consumption, energy and environment are increasing. How to improve energy utilization and reduce environmental pollution has aroused widespread concern in society. my country's en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/622C04B35/626C04B35/634C04B38/06C04B38/00B28B11/24H02N11/00
CPCB28B11/243C04B35/49C04B35/622C04B35/62605C04B35/63416C04B35/63424C04B38/0605C04B38/0645C04B2235/3208C04B2235/3215C04B2235/5445C04B2235/656C04B2235/6567H02N11/002C04B38/0074
Inventor 张妍谢文韬吕治东唐仲鼎李晓茹范凯龙周科朝
Owner CENT SOUTH UNIV
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