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Modified CaBi2Nb209 bismuth layered piezoceramic material and preparation method thereof

A piezoelectric ceramic and bismuth layered technology, applied in the field of piezoelectric ceramics, can solve the problems of low DC resistivity and inability to meet usage requirements, and achieve the effects of improving piezoelectric constant, piezoelectric performance, and high temperature resistivity.

Active Publication Date: 2013-05-29
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

Pure CaBi 2 Nb 2 o 9 The piezoelectric constant d 33 1.5%, DC resistivity at high temperature is relatively low (ρ v(500℃) 7 Ω·cm), its performance cannot meet the requirements of high temperature (450-550°C)

Method used

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  • Modified CaBi2Nb209 bismuth layered piezoceramic material and preparation method thereof
  • Modified CaBi2Nb209 bismuth layered piezoceramic material and preparation method thereof
  • Modified CaBi2Nb209 bismuth layered piezoceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] By Bi 2 o 3 (high purity), SrCO 3 (industrial pure), Nb 2 o 5 (industrial pure), Sm 2 o 3 (chemically pure), Ca(OH) 2 (chemically pure), WO 3 (chemically pure), Ta 2 o 5 (chemically pure) as raw material, according to (Sm 0.02 Bi 1.98 o 2 ) 2+ (Sr 0.02 Ca 0.96 Bi 0.02 Nb 1.94 Ta 0.04 W 0.02 o 7 ) 2- The chemical ratio is used for batching, and the mass of each raw material calculated according to the above formula and the purity of each raw material is weighed one by one with a precise electronic balance. Deionized water and agate balls were used as the medium, mixed according to the ratio of raw materials: agate balls: deionized water = 1:1.2:0.8, and mixed by a planetary ball mill for 4 hours. Pour the mixed raw materials into a container, put them in an oven for drying, and then sieve at least twice to make the powder uniform; then put them into an electric furnace for synthesis at 900°C for 1 hour. The synthesized powder was pulverized and then...

Embodiment 2

[0043] By Bi 2 o 3 (high purity), SrCO 3 (industrial pure), Nb 2 o 5 (industrial pure), Ca(OH) 2 (chemically pure), WO 3 (chemically pure) as raw material, according to (Bi 2 o 2 ) 2+ (Ca 0.96 Bi 0.04 Nb1.94 W 0.06 o 7 ) 2- chemical formulations for preparation. The mass of each raw material calculated according to the above-mentioned formula and the purity of each raw material is weighed one by one with an accurate electronic balance. Use deionized water and agate balls as the medium, mix according to the ratio of raw materials: agate balls: deionized water = 1: 1.2: 0.8, and mix the materials through a planetary ball mill for 2 hours. Pour the mixed raw materials into a container, put them in an oven for drying, and then sieve at least twice to make the powder uniform; then put them into an electric furnace for synthesis at 850°C for 4 hours. The synthesized powder was pulverized and then finely ground, using deionized water and agate balls as the medium, mixe...

Embodiment 3

[0045] By Bi 2 o 3 (high purity), Nb 2 o 5 (industrial pure), Sm 2 o 3 (chemically pure), Ca(OH) 2 (chemically pure), WO 3 (chemically pure), Ta 2 o 5 (chemically pure) is raw material, and preparation technology is with embodiment 1, by (Sm 0.03 Bi 1.97 o 2 ) 2+ (Ca 0.96 Bi 0.04 Nb 1.92 Ta 0.04 W 0.04 o 7 ) 2- chemical formulations for preparation. The main properties of the material are: d 33 =12.3pC / N, ε 33 T / ε o = 175, tanδ = 0.38%, T c =920°C, ρ v(500℃) =4.5×10 8 Ω cm, ρ v(600℃) =3.3×10 7 Ω·cm.

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Abstract

The invention, belonging to the field of piezoelectric ceramics, relates to a modified CaBi2Nb209 bismuth layered piezoceramic material and a preparation method thereof. The modified CaBi2Nb209 bismuth layered piezoceramic material is represented as the following formula: (SmxBi2-xO2)2+(SryCa1-y-zBizNb2-m-nTamWnO7)2-, wherein, x is not less than 0 and not larger than 0.5, y is not less than 0 andnot larger than 0.2, z is not less than 0 and not larger than 0.2, m is not less than 0 and not larger than 0.2, and n is not less than 0 and not larger than 0.3. The modified CaBi2Nb209 bismuth layered piezoceramic material disclosed in the invention has the following main performances: d33 is not less than 12 pC / N, tan delta is not larger than 0.50%, Tc is not less than 916 DEG C, rho v (500 DEG C) is not less than 108 ohm.cm, and rho v (600 DEG C) is not less than 107 ohm.cm, and can be reused at the temperature of 480-550 DEG C. Various ceramic elements assembled by ceramic elements produced by using the material can be widely applied to the aspects of measurement, detection and automatic control under the condition of extremely high temperature.

Description

technical field [0001] The invention belongs to the field of piezoelectric ceramics, in particular to a modified CaBi 2 Nb 2 o 9 Bismuth layer structure piezoelectric ceramic material and preparation method thereof. Background technique [0002] The detection of vibration is almost involved in every engineering field. Vibration sensors are necessary to detect vibrations, and piezoelectric acceleration sensors are one of the most widely used and most varied sensors. In the vibration detection of important equipment such as thermal power generating units, metallurgical rolling mills, steel plate rolling machines and other large-scale operating equipment, high-temperature piezoelectric acceleration sensors are inseparable. Among them, the most used one is the high-temperature piezoelectric accelerometer at 300°C to 500°C. [0003] At present, the application of high-temperature piezoelectric sensor devices puts forward higher requirements for piezoelectric ceramic material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187H01L41/43C04B35/495C04B35/622H10N30/853H10N30/097
Inventor 李玉成姚烈董显林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI