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Cooling material with electrocaloric effect

An electric card effect and matrix technology, applied in the field of composite materials, can solve the problems of inability to industrialize, restrict the application of electric card refrigeration devices, etc., and achieve the effects of loose experimental conditions, economic cost savings, high electric card effect and electric card coefficient.

Inactive Publication Date: 2019-11-12
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because there are not many materials with strong electric card effect and wide working temperature, and the materials with electric card effect researched now cannot be industrialized
Taking the ternary polymer film P (VDF-TrFE-CFE) as an example, a refrigerator with a cooling power of only 1W requires an area of ​​250cm 2 , while in conventional laboratories, only 4.9cm 2 the membrane, the membrane α 0 =382MV / m, β=6.6, where α 0 and β are the breakdown strength and linear regression fitting slope in the Wellbull distribution function, respectively, and when β is small, the breakdown strength decreases rapidly with the increase of the film area, these factors restrict the application of electric card refrigeration devices

Method used

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  • Cooling material with electrocaloric effect
  • Cooling material with electrocaloric effect
  • Cooling material with electrocaloric effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Ba(Ti 0.96 Nb 0.04 )O 3 Preparation of / P(VDF-TrFE-CFE) composites

[0035] 1. Put 2.4g of sodium hydroxide into a beaker, add water to 60ml, then take 3.05g of barium chloride dihydrate into the aqueous solution of sodium hydroxide, stir at 80°C for 2 hours, then add 0.96g of titanium dioxide to it and 0.07 g of H 5 Nb 3 o 10 , and then fully mixed, put into a vacuum kettle, heated to 200°C, kept for 20h, collected the product, rinsed with low-concentration hydrochloric acid, water and ethanol, dried at 80°C for 12h, and the product obtained was Ba(Ti 0.96 Nb 0.04 )O 3 round particles.

[0036] 2. Weigh 1g Ba(Ti 0.96 Nb 0.04 )O 3 and 1g of polymer P(VDF-TrFE-CFE), which were respectively added to 9g of N.N-dimethylformamide, stirred thoroughly, and dispersed to a stable suspension by ultrasonic vibration. Then take 0.11g, 0.22g, 0.35g, 0.5g, 0.67g Ba(Ti 0.96 Nb 0.04 )O 3 Put the suspension and 2g of the polymer suspension in a beaker, and stir...

Embodiment 2

[0038] Example 2: Ba(Ti 0.97 Nb 0.03 )O 3 Preparation of / P(VDF-TrFE-CFE) composites

[0039] 1. Weigh 3.63g of barium carbonate, 1.43g of titanium dioxide, 0.07g of niobium pentoxide and a certain amount of ethanol solution, pour the balls, materials, and ethanol into the ball mill jar in an appropriate proportion, and use a planetary ball mill to carry out mixed wet milling for 24 hours , then take it out and dry it, and put it in a muffle furnace at 1000°C for 5 hours. The resulting product is Ba(Ti 0.97 Nb 0.03 )O 3 round particles.

[0040] 2. Weigh 1g Ba(Ti 0.97 Nb 0.03 )O 3 and 1g of polymer P(VDF-TrFE-CFE), which were respectively added to 9g of N.N-dimethylformamide, stirred thoroughly, and dispersed to a stable suspension by ultrasonic vibration. Then take 0.11g, 0.22g, 0.35g, 0.5g, 0.67g Ba(Ti 0.97 Nb 0.03 )O 3 Put the suspension and 2g of the polymer suspension in a beaker, and stir thoroughly at a stirring speed of 1000r / min, so that the ceramic parti...

Embodiment 3

[0042] Embodiment 3: Ba(Ti 0.958 Nb 0.042 )O 3 Preparation of / P(VDF-TrFE-CFE) composites

[0043] 1. Weigh 3.26g of barium oxide, 1.63g of titanium dioxide, 0.12g of niobium pentoxide and a certain amount of ethanol solution, pour the balls, materials, and ethanol into the ball mill jar in an appropriate proportion, and use a planetary ball mill for mixed wet milling for 24 hours , then take it out and dry it, and put it in a muffle furnace at 1000°C for 5 hours. The resulting product is Ba(Ti 0.958 Nb 0.042 )O 3 round particles.

[0044] 2. Weigh 1g Ba(Ti 0.958 Nb 0.042 )O 3 and 1g of polymer P(VDF-TrFE-CFE), which were respectively added to 9g of N.N-dimethylformamide, stirred thoroughly, and dispersed to a stable suspension by ultrasonic vibration. Then take 0.22g, 0.27g, 0.33g, 0.38g Ba(Ti 0.958 Nb 0.042 )O 3 Put the suspension and 2g of the polymer suspension in a beaker, and stir thoroughly at a stirring speed of 1000r / min, so that the ceramic particles are...

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Abstract

The invention discloses a cooling material with electrocaloric effect, wherein the cooling material comprises 1-50% by mass of a perovskite structure filler and 50-99% by mass of a macromolecule polymer substrate. According to the present invention, the isothermal entropy change and the adiabatic temperature change at 800 KV / cm respectively can reach more than 60 KJ.cm<-3>k<-1> and 9 DEG C, the refrigerant capacity is higher than 0.7 MJ.m<-3>, the actual working temperature range is up to 60 DEG C, and the cooling material has high electrocaloric effect compared with pure ceramics or polymer materials.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a composite material with electric card effect. Background technique [0002] With the rapid development of electronic devices, efficient heat dissipation is becoming more and more important to avoid damage caused by overheating. According to the results of the U.S. Air Force Avionics Integrity Program, 55% of electronic product failures are caused by temperature, and with As the junction temperature rises, the failure rate increases exponentially, which creates an urgent need to explore new methods and materials for heat dissipation and switching. Current heat dissipation methods include air cooling, water cooling, semiconductor cooling, heat pipe cooling, and heat sinks made of thermally conductive materials, but they all have their own shortcomings. For example, the air-cooled heat dissipation method is heavy and noisy, the water cooling method has a large volum...

Claims

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Application Information

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IPC IPC(8): C09K5/14C04B35/468C04B35/622
CPCC04B35/468C04B35/622C04B2235/3255C09K5/14
Inventor 于淑会阮盼盼孙蓉
Owner SHENZHEN INST OF ADVANCED TECH
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