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Preparation method of high grain orientation piezoceramic material

A piezoelectric ceramic, high-grain technology, applied in the field of piezoelectric ceramic material preparation, can solve the problems of low degree of orientation and density, and achieve the effect of improving sensitivity and promoting application

Inactive Publication Date: 2014-02-05
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low orientation degree and low density in the existing piezoelectric ceramic grain orientation technology, and on this basis, combine the advantages of hot forging and casting template forming method (TGG) to propose a high crystal grain Preparation method of grain-oriented piezoelectric ceramic material

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  • Preparation method of high grain orientation piezoceramic material
  • Preparation method of high grain orientation piezoceramic material

Examples

Experimental program
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Embodiment 1

[0041] A High Grain Oriented Piezoelectric Ceramic Material Ca 2 Nb 2 o 7 The preparation method:

[0042] (1) Prepare spherical powder Ca by solid phase method combined with ball milling process 2 Nb 2 o 7

[0043] CaCO 3 and Nb 2 o 5 According to the molar ratio of 2:1, use a planetary ball mill to mix for 2 to 4 hours at a speed of 500 rpm. After drying, the ball-milled powder is synthesized in an atmospheric atmosphere. The synthesis temperature is 1250 ° C and kept for 4 hours; Ca 2 Nb 2 o 7 Ceramic powder, the ceramic powder is ball milled and mixed for 24 hours at a speed of 500 rpm with a planetary ball mill to make Ca 2 Nb 2 o 7 The particle size of the powder is fine and evenly distributed, and the spherical powder Ca 2 Nb 2 o 7 , spherical powder Ca 2 Nb 2 o 7 The SEM picture is as follows figure 1 shown.

[0044] (2) The flake powder Ca 2 Nb 2 o 7

[0045] (a) The case of molten salt method at 1000°C:

[0046] CaCO 3 , Nb 2 o 5 , NaCl ...

Embodiment 2

[0055] High Grain Oriented Nd 2 Ti 2 O 7 The preparation method of ceramic, the Nd 2 O 3 and TiO 2 According to the molar ratio of 1:2, use a planetary ball mill at 500 r / min for ball milling and mixing for 2 to 4 hours. After drying, the ball-milled powder is synthesized in the atmospheric atmosphere, and the synthesis temperature is 1150 ° C for 4 hours; that is, the composition is obtained. Nd 2 Ti 2 O 7 ceramic powder. The ceramic powder was ball-milled and mixed with a planetary ball mill at 500 rpm for 24 hours to make Nd 2 Ti 2 O 7 The particle size of the powder is fine and the distribution is uniform, and the spherical powder Nd is obtained. 2 Ti 2 O 7 .

[0056] will Nd 2 O 3 , TiO 2 , NaCl and KCl according to the molar ratio of 1:2:9:9 with a planetary ball mill at a speed of 500 r / min for 4 hours, and after drying, the ball-milled powder was synthesized in the atmosphere, and the synthesis temperature was 1100 ℃ Incubate for 4 hours; then the syn...

Embodiment 3

[0059] A High Grain Oriented Piezoelectric Ceramic Material Sr 2 Nb 2 O 7 The preparation method:

[0060] (1) Preparation of spherical powder Sr by solid-phase method combined with ball milling process 2 Nb 2 O 7

[0061] SrCO 3 and Nb 2 O 5 According to the molar ratio of 2:1, use a planetary ball mill at 500 r / min for ball milling and mixing for 2 to 4 hours. After drying, the ball-milled powder is synthesized in the atmospheric atmosphere, and the synthesis temperature is 1250 °C for 4 hours; that is, the composition is obtained. Sr 2 Nb 2 O 7 The ceramic powder was mixed with a planetary ball mill at 500 rpm for 24 hours to make Sr 2 Nb 2 O 7 The particle size of the powder is fine and the distribution is uniform, and the spherical powder Sr is obtained. 2 Nb 2 O 7 .

[0062] (2) Preparation of flake powder Sr by molten salt method 2 Nb 2 O 7

[0063] SrCO 3 , Nb 2 O 5 , NaCl and KCl according to the molar ratio of 2: 1: 9: 9 with a planetary ball...

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Abstract

The invention relates to a preparation method of a high grain orientation piezoceramic material. The general chemical formula of the high grain orientation piezoceramic material is XaYbOc, wherein X and Y are respectively an element from Ca, Nd, Ti, Nb or Sr, and X is different from Y; O is oxygen; and a, b and c are all positive integer, and the number of positive and negative charges is balanced among a, b and c. The preparation method comprises the following steps: (1) a spheroidic powder XaYbOc is prepared by a solid phase method with the combination of a ball-milling technology; (2) a flaky powder XaYbOc is prepared by a molten salt method; (3) the spheroidic powder XaYbOc and the flaky powder XaYbOc are mixed and undergo hot-pressing so as to obtain the high grain orientation piezoceramic material XaYbOc. In comparison with a traditional grain orientation technology, the preparation method provided by the invention has the following characteristics: the high grain orientation piezoceramic material prepared by the preparation method has higher grain orientation degree and higher density; and the preparation technology is simple.

Description

technical field [0001] The invention relates to a preparation method of a piezoelectric ceramic material, in particular to a preparation method of a piezoelectric ceramic material with high grain orientation. Background technique [0002] High-temperature piezoelectric sensing technology has important applications in chemical industry, material preparation, automobile, aviation and power generation. High-temperature piezoelectric accelerometers that can work stably at high temperatures above 300°C have been widely used in military and civilian fields such as aviation, aerospace, nuclear energy, power generation, metallurgy, shipping, and chemical industry to detect and control systems. [0003] High-temperature piezoelectric materials (including ceramics and single crystals) are the core components of high-temperature piezoelectric sensors. my country has actively carried out the research and development of high-temperature piezoelectric sensors since the end of the 1970s, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/495C04B35/462C04B35/622
Inventor 曾涛晏海学王保锋吴江
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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