Lithium-cerium-tantalum codoping niobic acid-bismuth-calcium based piezoceramic material and preparation method thereof

A technology based on calcium bismuth niobate and calcium bismuth niobate is applied in the field of material science and engineering to achieve the effects of improving compactness, good sintering effect and dense grains

Active Publication Date: 2014-07-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the co-doping of A and B sites of CBN-based ceramics

Method used

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  • Lithium-cerium-tantalum codoping niobic acid-bismuth-calcium based piezoceramic material and preparation method thereof
  • Lithium-cerium-tantalum codoping niobic acid-bismuth-calcium based piezoceramic material and preparation method thereof
  • Lithium-cerium-tantalum codoping niobic acid-bismuth-calcium based piezoceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of bismuth calcium niobate based ceramic powder

[0037] Raw material according to general formula Ca 0.92 (Li, Ce) 0.04 Bi 2 Nb 1.95 Ta 0.05 o 9 (x=0.08, y=0.05) for weighing and batching, using absolute ethanol as the dispersion medium, mixing the raw material and absolute ethanol at a mass ratio of 1:1.5, putting them in a polyurethane ball mill tank, and ball milling for 12 hours with a planetary ball mill , with a rotating speed of 400rpm, baked for 2h under a baking lamp, then continuously raised the temperature to 850°C in a programmed temperature-controlled box furnace, and kept it warm for 2h to obtain bismuth-calcium niobate-based ceramic powder;

[0038](2) Secondary ball milling

[0039] Mix the above-mentioned calcium bismuth niobate-based ceramic powder with the dispersion medium absolute ethanol at a mass ratio of 1:1.5, put it in a polyurethane ball mill jar, mill it with a planetary ball mill for 12 hours at a speed of 400 rpm, and...

Embodiment 2

[0047] Raw material according to general formula Ca 0.92 (Li, Ce) 0.04 Bi 2 Nb 1.9 Ta 0.1 o 9 (x=0.08, y=0.1) for weighing and batching, using absolute ethanol as the dispersion medium, mixing the raw material and absolute ethanol at a mass ratio of 1:1.5, putting them in a polyurethane ball mill tank, and milling for 12 hours with a planetary ball mill , with a rotating speed of 400rpm, baked for 2h under a baking lamp, then continuously raised the temperature to 850°C in a programmed temperature-controlled box furnace, and kept it warm for 2h to obtain bismuth-calcium niobate-based ceramic powder;

[0048] (2) Secondary ball milling

[0049] Mix the above-mentioned calcium bismuth niobate-based ceramic powder with the dispersion medium absolute ethanol at a mass ratio of 1:1.5, put it in a polyurethane ball mill jar, mill it with a planetary ball mill for 12 hours at a speed of 400 rpm, and bake it under a baking lamp for 2 hours make it dry;

[0050] (3) Granulation ...

Embodiment 3

[0057] (1) Preparation of bismuth calcium niobate based ceramic powder

[0058] Raw material according to general formula Ca 0.92 (Li, Ce) 0.04 Bi 2 Nb 1.85 Ta 0.15 o 9 (x=0.08, y=0.15) Weighing and batching, using absolute ethanol as the dispersion medium, mixing the raw material and absolute ethanol at a mass ratio of 1:1.5, putting them in a polyurethane ball mill tank, and ball milling for 12 hours with a planetary ball mill , with a rotating speed of 400rpm, baked for 2h under a baking lamp, then continuously raised the temperature to 850°C in a programmed temperature-controlled box furnace, and kept it warm for 2h to obtain bismuth-calcium niobate-based ceramic powder;

[0059] (2) Secondary ball milling

[0060] Mix the above-mentioned calcium bismuth niobate-based ceramic powder with the dispersion medium absolute ethanol at a mass ratio of 1:1.5, put it in a polyurethane ball mill jar, mill it with a planetary ball mill for 12 hours at a speed of 400 rpm, and ba...

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Abstract

The invention discloses a lithium-cerium-tantalum codoping niobic acid-bismuth-calcium based piezoceramic material and a preparation method thereof. The lithium-cerium-tantalum codoping niobic acid-bismuth-calcium based piezoceramic material is characterized by being expressed by a general formula Ca1-x(Li,Ce)x/2Bi2Nb2-yTayO9, wherein x is greater than or equal to 0.02 and is less than or equal to 0.15, y is greater than or equal to 0.01 and is less than or equal to 0.3, x expresses the molar fractions of lithium and cerium on the site A, and y expresses the molar fraction of tantalum on the site B. The preparation method of the piezoceramic material comprises the following steps: preparing a niobic acid-bismuth-calcium (CNB) ceramic powder material by adopting a solid phase method, wherein the doping amounts of the lithium and cerium (Li, Ce) on the site A and the tantalum (Ta) on the site B in the niobic acid-bismuth-calcium (CNB) ceramic powder material are different; and then preparing the lithium-cerium-tantalum codoping CBN based piezoceramic material by pelleting, tabletting, discharging rubber, sintering, silvering and polarizing. The results show that the crystal particles of the lithium-cerium-tantalum codoping CBN based piezoceramic material obtained by preparation at a relatively low sintering temperature of 1100 DEG C are relatively compact and uniform, the sintering activity and compactness of ceramics are improved, and the sintering effect is relatively good; the piezoceramic performance of the piezoceramic material is greatly improved, and the dielectric loss of the piezoceramic material is reduced.

Description

technical field [0001] The invention relates to a lithium, cerium and tantalum co-doped bismuth calcium niobate-based piezoelectric ceramic material and a preparation method thereof. Specifically, lithium, cerium and tantalum (Li, Ce , Ta) element, and polarized at a higher temperature and electric field to obtain a CBN-based piezoelectric ceramic material, which belongs to the field of material science and engineering. Background technique [0002] With the rapid development of modern science and technology, many industrial sectors and scientific research institutions such as energy, automobile, aerospace, petrochemical, geological exploration, atomic energy, etc. urgently need electronic equipment that can work at higher temperatures. Bismuth-containing layered structure piezoelectric ceramics have the advantages of high Tc, low dielectric constant, obvious anisotropy of electromechanical coupling coefficient, low aging rate, high resistivity, low production cost and easy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 朱建国王亚丹陈强彭志航肖定全
Owner SICHUAN UNIV
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