Pyroelectric ceramic material and preparation method thereof

A technology of pyroelectric ceramics and ceramic powders, which is applied in the field of ceramic materials, can solve the problems of limited practical application and large thermal hysteresis, and achieves a wide application temperature range, low dielectric loss, stable and moderate pyroelectric coefficient. Effect

Inactive Publication Date: 2012-06-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this phase transition is induced by an electric field, the thermal hysteresis is very large (>30°C) when heating and cooling, which limits its practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a) According to the general formula: (Pb 1.005 )(Mg 1 / 3 Nb 2 / 3 ) 0.07 (Zr 0.83 sn 0.02 Ti 0.15 ) 0.93 o 3 +4.5at.%Mn Weigh Pb in stoichiometric ratio 3 o 4 229.7g, ZrO 2 94.9g, TiO 2 11.2g, SnO 2 21.4g, MnCO 3 27.1g, Nb 2 o 5 6.2g, Mg 2 (OH) 2 CO 3 1.7g, then add 0.3g Al2 o 3 and 0.3g SiO 2 Add deionized water 313.8g, material: ball: water=1: 1.5: 0.7, carry out wet ball milling 24 hours with agate ball as ball milling medium; Oven dry, briquette, synthesize under air atmosphere: with 2 ℃ / min The heating rate was raised to 830°C, and then kept for 2 hours to obtain ceramic powder;

[0033] b) The ceramic powder obtained in step a) is finely ground for 24 hours by wet ball milling method, material: ball: water=1: 1.8: 0.6, and the ball milling medium is agate ball; after drying, add 10 g of PVA with a concentration of 6wt.%. The aqueous solution is used as a binder for granulation, then aged for 22 hours, pressed and molded, and ejected at 800...

Embodiment 2

[0040] a) According to the general formula: (Pb 1.005 )(Mg 1 / 3 Nb 2 / 3 ) 0.07 (Zr 0.83 sn 0.02 Ti 0.15 ) 0.93 o 3 +3at.%Mn+0.3at.%Fe to weigh the stoichiometric ratio of Pb 3 o 4 229.7g, ZrO 2 94.9g, TiO 2 11.2g, SnO 2 21.4g, MnCO 3 17.8g, Fe 2 o 3 1.2g, Nb 2 o 5 6.2g, Mg 2 (OH) 2 CO 3 1.7g, then add 0.3g Al 2 o 3 and 0.3g SiO 2 Add deionized water 313.8g, material: ball: water=1: 1.5: 0.7, carry out wet ball milling 24 hours with agate ball as ball milling medium; Oven dry, briquette, synthesize under air atmosphere: with 2 ℃ / min The heating rate was increased to 880°C, and then kept for 1 hour to obtain ceramic powder;

[0041] b) The ceramic powder obtained in step a) is finely ground for 28 hours by wet ball milling, material: ball: water=1: 1.6: 0.5, the ball milling medium is agate balls; after drying, add 12g of PVA with a concentration of 5wt.%. The aqueous solution is used as a binder for granulation, then aged for 26 hours, pressed and ...

Embodiment 3

[0047] a) According to the general formula: (Pb 1.005 )(Mg 1 / 3 Nb 2 / 3 ) 0.07 (Zr 0.83 sn 0.02 Ti 0.15 ) 0.93 o 3 +3at.%Mn Weigh Pb in stoichiometric ratio 3 o 4 229.7g, ZrO 2 94.9g, TiO 2 11.2g, SnO 2 21.4g, MnCO 3 17.8g, Nb 2 o 5 6.2g, Mg 2 (OH) 2 CO 3 1.7g, then add 0.3g Al 2 o 3 and 0.3g SiO 2 Add deionized water 313.8g, material: ball: water=1: 1.5: 0.7, carry out wet ball milling 24 hours with agate ball as ball milling medium; Oven dry, briquette, synthesize under air atmosphere: with 2 ℃ / min The heating rate was increased to 800°C, and then kept for 3 hours to obtain ceramic powder;

[0048] b) The ceramic powder obtained in step a) is finely ground for 20 hours by wet ball milling, material: ball: water = 1: 1.6: 0.5, and the ball milling medium is agate ball; after drying, add 7.5g of 8wt.% PVA aqueous solution is used as a binder to granulate, then aged for 24 hours, pressed and molded, and ejected at 850°C to obtain a ceramic green body; ...

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Abstract

The invention discloses a pyroelectric ceramic material and a preparation method thereof. The pyroelectric ceramic material has the following general formula: (Pb[1+delta])(Mg1/3Nb2/3)z(ZrxSn[1-x-y]Tiy)[1-z]O3+w at.%A, wherein delta is more than 0 and less than or equal to 0.05, w is more than 0 and less than or equal to 10, x is more than or equal to 0.75 and less than or equal to 0.90, y is more than or equal to 0.10 and less than or equal to 0.25, and z is more than or equal to 0.01 and less than or equal to 0.10; A is any or a combination of more than two of Fe, Cr and Mn. The preparation method of the pyroelectric ceramic material comprises the following steps of: synthesizing ceramic powder; preparing a ceramic green body; sintering; plating a Ni electrode with a chemical method; and polarizing in silicon oil. The pyroelectric ceramic material disclosed by the invention has stable and moderate pyroelectric coefficient, low dielectric constant, low dielectric loss and adjustable resistance in a great range, and is hopeful to be applied to the field of non-refrigeration infrared detection.

Description

technical field [0001] The invention relates to a pyroelectric ceramic material and a preparation method thereof, belonging to the technical field of ceramic materials. Background technique [0002] The pyroelectric effect refers to the effect that materials with spontaneous polarization generate charges after temperature changes, which can be directly used in infrared detection, thermal-electric energy conversion, and thermal Joule applications. Commonly used pyroelectric materials include single crystals, ceramics, etc. , polymers and other types. Through the combination of different physical parameters of pyroelectric materials, new parameters for evaluating the pyroelectric performance of materials can be obtained, which is the so-called Figure of Merit (FoM). The commonly used figure of merit FoM is as follows: [0003] 1. Voltage figure of merit: F v =p / (cεε 0 ); [0004] 2. Current figure of merit: F i =p / c; [0005] 3. Detection figure of merit: F D =p / c(εε ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/622
Inventor 郭少波董显林王根水姚春华曹菲陈建和
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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