Thick BZT film having EC effect, and its making method

A thick film and effect technology, applied in the field of BZT thick film and its preparation, can solve the problems of ECE concept understanding and measurement technology immature, weak electrothermal effect, etc., to achieve the effect of reducing dielectric loss and improving the use effect

Inactive Publication Date: 2015-01-28
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As early as 1930, Kobeko P and Kurchatov I. observed the electric field cooling phenomenon in the Rochelle salt ferroelectric material, which is called the electrocaloric card effect by later generations; unfortunately, it is due to the electrocaloric effect of materials discovered in the past For various reasons such as very weak, this result has not received everyone's attention; at the same time, the conceptual understanding of ECE and the immature measurement technology have always been controversial about ECE

Method used

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  • Thick BZT film having EC effect, and its making method
  • Thick BZT film having EC effect, and its making method
  • Thick BZT film having EC effect, and its making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The invention provides a kind of preparation method of the BZT thick film with EC effect, comprises the following steps:

[0031] 1) Preparation of calcined powder

[0032] BaCO 3 、TiO 2 , ZrO 2 Weighing according to the mass ratio of 1:1:0.3, ball milling, and then pre-calcining at 1200°C for 2 hours to obtain pre-calcined powder;

[0033] 2) Preparation of slurry

[0034] Ball mill the calcined powder, add casting agent A and casting agent B, and prepare Tape-casting slurry, wherein, casting agent A is a mixed solution of 95% ethanol and methyl ethyl ketone and 5% PVB Composed according to any proportion; the casting agent B is composed of a mixed solution of ethanol and butanone with a concentration of 65-70%, PVB with a concentration of 20-25% and a plasticizer with a concentration of 10-15% according to any proportion; wherein, The mass ratio of calcined powder to casting agent A and casting agent B is 1:0.2:0.3;

[0035] 3) BZT thick film preparation

[003...

Embodiment 2

[0038] The invention provides a kind of preparation method of the BZT thick film with EC effect, comprises the following steps:

[0039] 1) Preparation of calcined powder

[0040] BaCO 3 、TiO 2 Weighing according to the mass ratio of 1:0.7, ball milling, and then pre-calcining at 900°C for 8 hours to obtain pre-calcined powder;

[0041] 2) Preparation of slurry

[0042] Ball mill the calcined powder, add casting agent A and casting agent B, and prepare Tape-casting slurry. Among them, casting agent A is a mixed solution of 90% ethanol and methyl ethyl ketone and 10% PVB Composition according to any proportion; Casting agent B is composed of a mixed solution of ethanol and methyl ethyl ketone with a concentration of 70%, PVB with a concentration of 25% and a plasticizer with a concentration of 15% according to any proportion; wherein, calcined powder and casting The mass ratio of agent A and casting agent B is 1:0.6:0.6;

[0043] 3) BZT thick film preparation

[0044] The...

Embodiment 3

[0046] The invention provides a kind of preparation method of the BZT thick film with EC effect, comprises the following steps:

[0047] 1) Preparation of calcined powder

[0048] BaCO 3 、TiO 2 , ZrO 2 Weighing according to the mass ratio of 1:0.8:0.2, ball milling, and then pre-calcining at 1000°C for 6 hours to obtain pre-calcined powder;

[0049] 2) Preparation of slurry

[0050] Ball mill the calcined powder, add casting agent A and casting agent B, and prepare Tape-casting slurry. Among them, casting agent A is a mixed solution of 94% ethanol and methyl ethyl ketone and 8% PVB Composition in any proportion; Casting agent B is composed of a mixed solution of ethanol and methyl ethyl ketone with a concentration of 68%, PVB with a concentration of 24% and a plasticizer with a concentration of 12% in any proportion; wherein, calcined powder and casting The mass ratio of agent A and casting agent B is 1:0.4:0.4;

[0051] 3) BZT thick film preparation

[0052] The prepared...

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Abstract

The invention discloses a thick BZT film having an EC effect, and its making method. The method for making the thick BZT film through a tape casting prcoess comprises the following steps: 1, preparation pre-burning powder: weighing raw materials according to molar amounts, carrying out ball milling, and pre-burning at 900-1200DEG C to obtain the pre-burning powder; 2, preparing a slurry: carrying out ball milling on the pre-burning powder, and using a medium A and a medium B to prepare a Tape-casting slurry; and 3, making a thick BZT film: carrying out tape casting on the prepared Tape-casting slurry to make a thin film, making an electrode on the thin film through a screen printer, laminating thin films with electrodes to make the thick BZM film, and carrying out sintering molding to form the thick BZT film having an EC effect. A result of detection of the enthalpy of the EC effect of the thick BZT (Zr:Ti=(0-30):(100-70) film system through an indirect measurement technique is 2.8-5J.Kg<-1>K<-1>. The method provides a new way for searching a new refrigeration material.

Description

technical field [0001] The invention belongs to the field of novel functional energy-saving materials, and relates to a BZT thick film with EC effect and a preparation method thereof. Background technique [0002] With the development of industrial technology, human beings are facing many environmental and energy problems. For example, in the refrigeration industry, in developed countries and some developing countries, air conditioners, refrigerators and other refrigeration machinery consume more than 20% of electricity each year. Traditional air conditioners and refrigerators use mechanical work to drive a vapor compression cycle (mechanical vapor compression cycle, VCC) to achieve refrigeration. This method has a very low power utilization rate, and so far there is no new technology that can improve its power utilization rate; in addition, air conditioners use Electricity generally has more peak loads in the power system, and due to the reliability of the power grid syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/49C04B35/622
Inventor 张营堂艾桃桃刘华祝
Owner SHAANXI UNIV OF TECH
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