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High-temperature giant electrostrictive strain ceramic material and preparation method thereof

An electro-strain, ceramic material technology, used in ceramic molding machines, manufacturing tools, etc., can solve the problems of low operating temperature, limited Curie temperature, deterioration of piezoelectric performance, etc., and achieve large strain values, small hysteresis, cost reduction effect

Active Publication Date: 2020-04-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most piezoelectric materials or devices are limited by their physical properties such as Curie temperature, and their operating temperature is generally low, and the piezoelectric performance will obviously deteriorate with the increase of temperature.

Method used

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  • High-temperature giant electrostrictive strain ceramic material and preparation method thereof
  • High-temperature giant electrostrictive strain ceramic material and preparation method thereof
  • High-temperature giant electrostrictive strain ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] According to 0.95Bi 0.5 Na 0.5 TiO 3 -0.05Bi 0.1 Na 0.7 NbO 3 The chemical composition of bismuth oxide, sodium carbonate, titanium dioxide (rutile phase) and niobium oxide and other raw materials are weighed, and the ceramics are sintered by the traditional solid-state reaction method.

[0019] According to Bi 0.5 Na 0.5 TiO 3 (BNT) and Bi 0.1 Na 0.7 NbO 3 (BNN) ratio, weigh the above raw materials, add a suitable amount of alcohol, and carry out planetary ball milling for 4 hours; then dry the slurry, sieve and pre-calcine at 850°C for 2 hours; the obtained BNT and BNN The calcined powder is mixed and ball-milled for 4 hours according to the ratio of 0.95BNT-0.05BNN, dried and sieved, then added with an appropriate amount of polyvinyl alcohol aqueous solution (PVA), ground and granulated, and formed by dry pressing. Finally, debinding the green body at 600°C for 2 hours, and then sintering at 1080°C for 2 hours to obtain the ceramic material with the desire...

Embodiment 2

[0022] According to 0.925Bi 0.5 Na 0.5 TiO 3 -0.075Bi 0.1 Na 0.7 NbO 3 The chemical composition of bismuth oxide, sodium carbonate, titanium dioxide (rutile phase) and niobium oxide and other raw materials are weighed, and the ceramics are sintered by the traditional solid-state reaction method.

[0023] According to Bi 0.5 Na 0.5 TiO 3 (BNT) and Bi 0.1 Na 0.7 NbO 3 (BNN) ratio, weigh the above raw materials, add a suitable amount of alcohol, and carry out planetary ball milling for 4 hours; then dry the slurry, sieve and pre-calcine at 850°C for 2 hours; the obtained BNT and BNN The calcined powder was mixed and ball-milled for 4 hours according to the ratio of 0.925BNT-0.075BNN. After drying and sieving, an appropriate amount of polyvinyl alcohol aqueous solution (PVA) was added, ground and granulated, and formed by dry pressing. Finally, debinding the green body at 600°C for 2 hours, and then sintering at 1080°C for 2 hours to obtain the ceramic material with the...

Embodiment 3

[0026] According to 0.9Bi 0.5 Na 0.5 TiO 3 -0.1Bi 0.1 Na 0.7 NbO 3 The chemical composition of bismuth oxide, sodium carbonate, titanium dioxide (rutile phase) and niobium oxide and other raw materials are weighed, and the ceramics are sintered by the traditional solid-state reaction method.

[0027] According to Bi 0.5 Na 0.5 TiO 3 (BNT) and Bi 0.1 Na 0.7 NbO 3(BNN) ratio, weigh the above raw materials, add a suitable amount of alcohol, and carry out planetary ball milling for 4 hours; then dry the slurry, sieve and pre-calcine at 850°C for 2 hours; the obtained BNT and BNN The calcined powder is then mixed and ball milled for 4 hours according to the ratio of 0.9BNT-0.1BNN, dried and sieved, then added with an appropriate amount of polyvinyl alcohol aqueous solution (PVA), ground and granulated, and formed by dry pressing. Finally, debinding the green body at 600°C for 2 hours, and then sintering at 1080°C for 2 hours to obtain the ceramic material with the desire...

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Abstract

The invention discloses a high-temperature giant electrostrictive strain ceramic material. Bi0.5Na0.5TiO3 and Bi0.1Na0.7NbO3 are used as a matrix, and the chemical composition of the material is (1-x)Bi0.5Na0.5TiO3-xBi0.1Na0.7NbO3, wherein x is 0.05-0.2, and when x is equal to 0.1, the unipolar strain value of the ceramic material reaches about 1.6% of the maximum unipolar strain value at 185 DEGC, is equivalent to the current maximum strain value of a single crystal, and exceeds that of current lead-containing or lead-free piezoelectric ceramic, and the material has excellent performances. The electrostrictive strain curve of the material has small hysteresis quality and good linearity, the strain numerical value of the material can be accurately controlled through a corresponding electric field, and the material is expected to be applied to the field of high-temperature piezoelectric materials such as electronic control gasoline injection systems of automobiles and high-temperaturepiezoelectric actuators or motors, and can be used for accurately controlling an actuating system at a high temperature.

Description

technical field [0001] The invention belongs to the technical field of electronic functional materials and devices, and in particular relates to a high-temperature giant electrostrain ceramic material and a preparation method thereof. Background technique [0002] Piezoelectric ceramic material is an important functional material, which has been widely used in aerospace, petrochemical, electronic circuits and other fields. Utilizing the electrostrain properties of piezoelectric ceramics, piezoelectric actuators or motors can be fabricated. However, due to the large gap between the electrostrain performance of current piezoelectric ceramics, especially lead-free piezoelectric ceramics, and piezoelectric single crystals, if you want to use materials with huge electrostrain, you still have to choose a complex production process and low production cost. expensive single crystal material. In addition, due to the continuous development of industrial technology, higher requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/626B28B3/00
CPCB28B3/00C04B35/475C04B35/6261C04B2235/3201C04B2235/3251
Inventor 岳振星卞帅帅骆宇郭蔚嘉陈雨谷
Owner TSINGHUA UNIV
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