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Modified PZT piezoelectric ceramics with Nano powder being added to preburning material, and preparation method

A piezoelectric ceramic and nano-powder technology, which is used in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc. It can improve the electrical performance, low electromechanical coupling coefficient and good reproducibility.

Active Publication Date: 2007-05-09
ZHEJIANG JIAKANG ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, because there are a large number of lattice defects on the surface and inside of nano-powders, the introduction of nano-powders in the ceramic sintering process will have an impact on the dielectric constant and dielectric loss of ceramics.
[0009] In view of the significant effect of nanopowders on material sintering and defects, quite a few researchers at home and abroad have prepared full-component lead zirconate titanate nanopowders by different methods, including hydrothermal method, sol- Gel method, metal-organic thermal decomposition method and mechanochemical method, etc.; however, there are not many studies on the preparation of piezoelectric materials using full-component lead zirconate titanate nanopowders as raw materials and their effects on the performance of piezoelectric materials, and This method has the problem of high cost of finished products, and has little application value in industrialization
On the other hand, lead zirconate titanate system single raw material, such as TiO 2 The price of such nano-powders has dropped to an acceptable level for industrialization. Under the premise of improving the parameters of the key process, these commercialized nano-powder raw materials are used to partially replace the micron powder in the raw material components to obtain piezoelectric ceramics. The electrical properties can be tuned and improved rarely reported
In particular, this technology is applied to the manufacture of lead zirconate titanate ceramics for frequency components, combined with the improved process system, the material performance is greatly improved, and the industrialized nano-powder is added with modified lead zirconate titanate series. The research and patent of piezoelectric ceramics have not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Pb 1-X A X (Zr 0.45+Y Ti 0.35+Z )(B 1 / 3 C 2 / 3 ) δ o 3 , where x=0.1, Y=0.033, Z=0.067, δ=0.10, A is Mg, B is Mn, C is Nb; that is, the composition of Pb 0.90 Mg 0.1 (Zr 0.483 Ti 0.417 )(Mn 1 / 3 Nb 2 / 3 ) 0.10 o 3 ingredients, and nano TiO 2 Modifier and total TiO 2 The weight ratio is 20wt%; Nano ZrO 2 Modifier and total ZrO 2 The weight ratio is the requirement of 30wt%, according to the molar ratio of each component (micron powder) is Pb 3 o 4 :(MgCO 3 ) 4 ·Mg(OH) 2 ·5H 2 O: ZrO 2 :TiO 2 : MnCO 3 : Nb 2 o 5 =0.300:0.020:0.3381:0.3336:0.0333:0.0333. Weigh the raw material components lacking nano-powder; correspondingly, weigh the nano-TiO with a molar mass of 0.0834 2 Modifier, nanometer ZrO with a molar weight of 0.1449 2 Modifier spare. The above-mentioned micron powder Pb lacking the nanopowder component 3 o 4 , (MgCO 3 ) 4 ·(Mg(OH) 2 ·5H 2 O), ZrO 2 、TiO 2 , MnCO 3 , Nb 2 o 5 Mix evenly, according to the weight ratio of the m...

Embodiment 2

[0029] Pb 1-X A X (Zr 0.45+Y Ti 0.35+Z )(B 1 / 3 C 2 / 3 ) δ o 3 , wherein, x=0.04, Y=0.12, Z=0.03, δ=0.10, A is Ca, B is Sb, and C is Nb; that is, the composition of Pb 0.96 Ca 0.04 (Zr 0.570 Ti 0.380 )(Sb 1 / 3 Nb 2 / 3 ) 0.10 o 3 ingredients, and nano TiO 2 Modifier and total TiO 2 The weight ratio is 20wt%; Nano ZrO 2 Modifier and total ZrO 2 The weight ratio is the requirement of 30wt%, according to the molar ratio of each component (micron powder) is Pb 3 o 4 : CaCO 3 : ZrO 2 :TiO 2 :Sb 2 o 3 : Nb 2 o 5 =0.320:0.040:0.399:0.304:0.0167:0.0333. Weigh the raw material components lacking nano-powder; correspondingly, weigh the nano-TiO with a molar mass of 0.076 2 Modifier, nanometer ZrO with a molar weight of 0.171 2 Modifier spare. The above-mentioned micron powder Pb lacking the nanopowder component 3 o 4 , CaCO 3 , ZrO 2 、TiO 2 , Sb 2 o 3 , Nb 2 o 5 Mix evenly, according to the weight ratio of the mixture and deionized water is 2:1.0, add de...

Embodiment 3

[0031] Pb 1-X A X (Zr 0.45+Y Ti 0.35+Z )(B 1 / 3 C 2 / 3 ) δ o 3 , wherein, x=0.04, Y=0.22, Z=0.03, δ=0.06, A is Sr, B is Sb, C is Nb; that is, the composition of Pb 0.96 Sr 0.04 (Zr 0.670 Ti 0.380 )(Sb 1 / 3 Nb 2 / 3 ) 0.06 o 3 ingredients, and nano TiO 2 Modifier and total TiO 2 The weight ratio is 20wt%; Nano ZrO 2 Modifier and total ZrO 2 The weight ratio is the requirement of 30wt%, according to the molar ratio of each component (micron powder) is Pb 3 o 4 : SrCO 3 : ZrO 2 :TiO 2 :Sb 2 o 3 : Nb 2 o 5 =0.320:0.040:0.469:0.304:0.010:0.020. Weigh the raw material components lacking nano-powder; correspondingly, weigh the nano-TiO with a molar mass of 0.076 2 Modifier, nano-ZrO with a molar weight of 0.201 2 Modifier spare. The above-mentioned micron powder Pb lacking the nanopowder component 3 o 4 , SrCO 3 , ZrO 2 、TiO 2 , Sb 2 o 3 , Nb 2 o 5 Mix evenly, according to the weight ratio of the mixture and deionized water is 2:1.0, add deionized wat...

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Abstract

This invention relates to a method for preparing nanopowder-modified lead zirconate titanate piezoelectric ceramic. The method pre-sinters the raw materials without nanopowder, and then adds TiO2 and / or ZrO2 nanopowder as a substitute for micropowder into the pre-sintered raw materials, which can reduce pre-sintering temperature by 100-300 deg.C and final-sintering temperature by 50-100 deg.C, and can adjust the crystalline and properties of pre-sintered sample as well as the electrical properties of the sintered piezoelectric ceramic. Nanopowder-modified piezoelectric ceramic sintered at 1150 deg.C has a Curie point increased by 50-100 deg.C. Besides, the piezoelectric ceramic has excellent impact stability (TC = 350-400 deg.C; epsiv = 350-900; KP = 0.42-0.65), stable process and good repeatability. The piezoelectric ceramic can be used to produce ceramic frequency discriminator and ceramic filter.

Description

technical field [0001] The present invention relates to a modified lead zirconate titanate (PZT) series piezoelectric ceramics and a preparation method thereof, in particular to a modified lead zirconate titanate series piezoelectric ceramics prepared by adding nano-powder to pre-fired materials and The preparation method belongs to the technical field of functional ceramic preparation. Background technique [0002] Around 1942, barium titanate ceramics were successively discovered by scientists in the United States, the former Soviet Union and Japan, and became the first piezoelectric ceramic material with application prospects after the French Curie brothers discovered the "piezoelectric effect". In 1947, the first piezoelectric ceramic device-barium titanate (BT) pickup was born. In the early 1950s, the lead zirconate titanate (PZT) piezoelectric ceramic material with significantly better performance than barium titanate was successfully developed. Since then, the devel...

Claims

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Application Information

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IPC IPC(8): C04B35/491C04B35/622H01L41/187
Inventor 洪樟连王振陶锋烨李广慧郭煌戴黎明胥金华张火荣王民权
Owner ZHEJIANG JIAKANG ELECTRONICS CO LTD
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