Barium-titanate-based colossal-electrocaloric-effect chip-type laminate ceramic electrocaloric refrigeration device

A technology of electric card effect and refrigeration devices, which is applied in the field of electric card refrigeration devices of giant electric card effect laminated ceramics, can solve the problems of reducing equipment cost, high process requirements, expensive equipment, etc., to reduce energy consumption, Effect of lowering sintering temperature and improving mechanical properties

Inactive Publication Date: 2016-01-13
NASCEN SHANGHAI SMART TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sheet-type laminated ceramics based on polymer materials have high requirements f

Method used

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  • Barium-titanate-based colossal-electrocaloric-effect chip-type laminate ceramic electrocaloric refrigeration device
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  • Barium-titanate-based colossal-electrocaloric-effect chip-type laminate ceramic electrocaloric refrigeration device

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preparation example Construction

[0039] The preparation method of the giant electric card effect laminated ceramics based on barium titanate comprises the following steps:

[0040] Step (1), according to the doping ratio, weigh the barium titanate matrix and doping element raw materials, mix them to form the main material, and then weigh the main material and the additives, sintering aids, and glass co-solvents added as needed according to the mass percentage, Form a mixed powder, add a solvent and a ball mill and mill for 12-48 hours. The ball-milled powder is pre-calcined at 800-1200° C. to obtain a pre-calcined powder.

[0041] The additive can be selected from MnO 2 , MgO, CuO, ZnO, Sb 2 o 5 one or more of them. The purpose of adding the additive is to reduce the dielectric loss of ceramics. The glass cosolvent can be selected from B 2 o 3 , Li 2 O, Na 2 O, MgO, Al 2 o 3 , SiO 2 , V 2 o 5 、Cr 2 o 3 、Co 2 o 3 , ZnO, CuO, Sb 2 o 5 , BaO, Bi 2 o 3 , PbO, one or more, adding the glass co...

Embodiment 1

[0058] This embodiment is based on barium titanate-based giant electric card effect sheet-type laminated ceramic electric card refrigeration device, is based on barium titanate-based BaZr 0.2 Ti 0.8 o 3 Sheet-type laminated ceramics, the preparation method of the sheet-type laminated ceramics comprises the following steps:

[0059] 1) Preparation of calcined powder: BaCO 3 , ZrO 2 and TiO 2 Weigh the corresponding element raw materials according to the chemical formula for proportioning and weighing, and add MnO with a molar percentage of 1%. 2 Additives and mole percentages are 0.5% glass flux PbO, Li 2 O, ball milling; then the powder is heated from room temperature to the predetermined temperature at a rate of 5°C / min, and then kept for 2 hours, then raised to the sintering temperature at a rate of 1°C / min, kept for 2 hours, and then heated at 3°C / min rate down to room temperature.

[0060] 2) Preparation of slurry: ball mill the calcined powder, first add the first...

Embodiment 2

[0063] This embodiment is based on the electric card refrigeration device of the giant electric card effect sheet type laminated ceramic of barium titanate, which is based on barium titanate-based Ba(Ti 0.82 Zr 0.16 sn 0.02 )O 3 Sheet-type laminated ceramics, the preparation method of the sheet-type laminated ceramics comprises the following steps:

[0064] 1) Preparation of calcined powder: BaCO 3 、TiO 2 , ZrO 2 and SnO 2 Weigh the corresponding element raw materials according to the chemical formula for proportioning and weighing, and weigh the main materials, additives and glass flux MnO according to the mass percentage 2 、 Bi 2 o3 , B2O 3 , ball milling; then heat the powder from room temperature to a predetermined temperature at a rate of 3°C / min, keep it warm for 1-2 hours, then raise it to the sintering temperature at a rate of 1°C / min, keep it warm for 1-3 hours, then Decrease to room temperature at a rate of 3°C / min.

[0065] 2) Preparation of slurry: ball m...

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Abstract

The invention provides a barium-titanate-based colossal-electrocaloric-effect chip-type laminate ceramic electrocaloric refrigeration device. The chip-type laminate ceramic employs perovskite ABO3 structural barium titanate as a matrix for A-position doping or B-position doping or A position and B position simultaneous doping, so that a combined phase is formed. The device possesses the following advantages that through doping, the sintering condition of the chip-type laminate ceramic is improved, the sintering temperature is reduced and further energy consumption of the technology is reduced; the material mechanical properties (pressure resistance, stretching performance, shearing performance and toughness) are improved, and the material can satisfy demands of more usage environments; and the effective working temperature interval of the material is expanded.

Description

technical field [0001] The invention relates to the field of electric card refrigeration devices, in particular to an electric card refrigeration device based on barium titanate-based giant electric card effect laminated ceramics. Background technique [0002] At present, the refrigeration equipment widely used in air conditioners, refrigerators and other refrigerators mainly realizes refrigeration through mechanical vapor compression cycle. This method is inefficient, the refrigeration equipment is bulky, the power load is large, and the refrigeration cost is high. The pollution of the environment by the agent is also very large, which has been criticized. Magnetic card technology provides a new option for refrigeration, but high refrigeration efficiency often means large magnetic field strength, which also leads to very large equipment volume, which poses a challenge to practical applications. Semiconductor refrigeration provides another option, but its low energy convers...

Claims

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Application Information

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IPC IPC(8): C04B35/468
Inventor 程爱兰徐海生梁柱
Owner NASCEN SHANGHAI SMART TECH
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