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Ferroelectric ceramic micro refrigerator and producing method thereof

A technology of ferroelectric ceramics and micro-refrigerators, which is applied in the directions of refrigerators, refrigeration and liquefaction, machine operation mode, etc. Area of ​​thin slices, etc., to achieve the effect of convenient cooling/heat conversion, enhanced optional work, and light weight

Inactive Publication Date: 2008-09-17
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] 2) In the traditional dry ceramic preparation process, there are problems such as uneven mixing of materials, causing component segregation and introducing metal ion impurities.
[0012] 3) It is difficult to obtain ferroelectric ceramic thin slices with a thickness of less than 200 μm and a uniformity of more than 90% by using a grinding machine, and the high-precision crystal slicer cannot prepare large-area thin slices because of the expensive equipment, which is not conducive to ferroelectric ceramics. Popularization and Application of Electric Refrigerators
[0013] 4) It is more sensitive to test the EC effect of bulk ceramics by thermocouple contact under traditional silicone oil immersion, but the ferroelectric cooling capacity decreases after the working fluid material is miniaturized, and it is difficult for a thermocouple with a sensitivity of about 0.1°C to detect the tiny EC of the working fluid sheet. effect, so a temperature detection method with higher sensitivity must be used

Method used

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  • Ferroelectric ceramic micro refrigerator and producing method thereof
  • Ferroelectric ceramic micro refrigerator and producing method thereof
  • Ferroelectric ceramic micro refrigerator and producing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Embodiment 1: to analyze pure Pb (C 2 h 3 o 2 ) 2 Powder, chemically pure Ti(OC 4 h 9 ) 4 Solvent and Mg(C 2 h 3 o 2 ) 2 and electron pure Nb 2 o 5 Powder, etc. as raw materials, according to Pb (Mg 1 / 3 Nb 2 / 3 )O 3 with PbTiO 3 A formulation with a mol ratio of 85 / 15, with an excess of 4 mol% of Mg and 5 mol% of Pb. First, the above-mentioned PMNT raw materials meeting the stoichiometric ratio are miscible in an organic solvent of ethylene glycol ether to obtain a white sol. The sol is put into a ball mill jar and fully ball milled for 8 hours. At this time, various raw material components are mixed at a molecular level to obtain a PMNT precursor. The PMNT precursor was placed in an infrared oven to fully dry and gel at 120°C, and then placed in a resistance furnace for pre-calcination at 450°C and 750°C for 2 hours respectively to obtain PMNT pre-crystallized powder. The PMNT pre-crystallized powder is pressed into a green body with a mold at 120Mpa; f...

Embodiment 2

[0061] Embodiment 2: to analyze pure Pb (C 2 h 3 o 2 ) 2 Powder, chemically pure Ti(OC 4 h 9 ) 4 Solvent and Mg(C 2 h 3 o 2 ) 2 and electron pure Nb 2 o 5 Powder, etc. as raw materials, according to Pb (Mg 1 / 3 Nb 2 / 3 )O 3 with PbTiO 3 A formulation with a mol ratio of 85 / 15, with an excess of 6 mol% of Mg and 8 mol% of Pb. First, the above-mentioned PMNT raw materials meeting the stoichiometric ratio are miscible in an organic solvent of ethylene glycol ether to obtain a white sol. The sol is put into a ball mill jar, and is fully ball milled for 10 hours. At this time, each raw material component is mixed at a molecular level to obtain a PMNT precursor. The PMNT precursor was placed in an infrared oven to fully dry and gel at 180°C, and then placed in a resistance furnace for pre-calcination at 490°C and 800°C for 2 hours respectively to obtain PMNT pre-crystallized powder. The PMNT pre-crystallized powder is pressed into a green body with a mold at 160Mpa; f...

Embodiment 3

[0062] Embodiment 3: to analyze pure Pb (C 2 h 3 o 2 ) 2 Powder, chemically pure Ti(OC 4 h 9 ) 4 Solvent and Mg(C 2 h 3 o 2 ) 2 and electron pure Nb 2 o 5 Powder, etc. as raw materials, according to Pb (Mg 1 / 3 Nb 2 / 3 )O 3 with PbTiO3 A formulation with a mol ratio of 85 / 15, with an excess of 5 mol% of the Mg component and 7 mol% of the Pb component. First, the above-mentioned PMNT raw materials meeting the stoichiometric ratio are miscible in an organic solvent of ethylene glycol ether to obtain a white sol. The sol is put into a ball mill jar and fully ball milled for 9 hours. At this time, each raw material component is mixed at a molecular level to obtain a PMNT precursor. Put the PMNT precursor into an infrared oven to fully dry and gel at 160°C, then put it into a resistance furnace and pre-fire it at 470°C and 800°C for 2 hours respectively to obtain PMNT pre-crystallized powder. The PMNT pre-crystallized powder is pressed into a green body with a mold at...

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Abstract

A micro refrigerator of ferroelectric ceramics applies ' double stage - overlap' refrigerating structure and it is prepared adapting relaxation and solid solution of PMNT with high electro biological heat effect under wet preparation method of sol - gel . In said method, new mode of physical-chemical thickness reduction and new detecting means of electro biological heat property are applied.

Description

technical field [0001] The invention relates to a micro-refrigerator and a preparation method thereof, in particular to a ferroelectric ceramic micro-refrigerator and a preparation method thereof. Background technique [0002] At present, various refrigeration methods widely used in micro-refrigerators, such as mechanical compression of working fluid materials and application of electric and magnetic fields, are mainly based on the following three principles: [0003] 1) Semiconductor bismuth telluride-based pn junction refrigeration originates from the Peltier effect, but in the final analysis is due to the change of the barrier height during the carrier transition process; [0004] 2) Phase change refrigeration, derived from the latent heat change of the phase change of substances under induced conditions, such as ice-salt phase change cooling, dry ice phase change cooling, liquid evaporative cooling and other solid sublimation cooling, etc. Freon, which was eliminated in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B21/00
CPCF25B21/00F25B2321/001Y02B30/66Y02B30/00
Inventor 刘少波李艳秋
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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