A kind of anisotropic piezoelectric ceramic material and preparation method thereof

A piezoelectric ceramic and anisotropic technology, applied in the field of sensors, can solve the problems of demanding firing and polarization processes, difficulties in making lead metaniobate materials, difficulties in firing lead titanate materials, etc., and achieve easy organization of production , good and reliable performance, large anisotropy effect

Inactive Publication Date: 2015-11-18
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the firing of lead titanate materials is extremely difficult, and the high polarization electric field process (applied electric field strength is usually greater than 5000V / mm) also brings stringent requirements, which greatly reduces the success rate of polarization.
In addition lead metaniobate PbNb 2 o 5 Piezoelectric materials also have good anisotropy, and the isostatic piezoelectric constant g h up to 33.5×10 -3 V·m / N, but the production of lead metaniobate materials is particularly difficult, and the requirements for firing and polarization processes are very strict. At present, there are very few manufacturers that can provide large-scale lead metaniobate materials, and the price is naturally low. Cheap

Method used

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  • A kind of anisotropic piezoelectric ceramic material and preparation method thereof
  • A kind of anisotropic piezoelectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Composition I by material:

[0034] [0.75(0.7PbZrO 3 -0.3K 0.5 Bi 0.5 TiO 3 )-0.25PbTiO 3 ]+0.01PbZnNb 2 o 5 Carry out batching, weigh corresponding analytically pure raw material Pb 3 o 4 , ZrO 2 、KCO 3 、 Bi 2 o 3 、TiO 2 , ZnO, Nb 2 o 5 , put it into a ball mill jar, the ball mill medium is alcohol and zirconia balls, the weight ratio of material: ball: alcohol is 2:1:0.5, the ball mill is 3h, the speed is 600 rpm, after drying the mixture, put it into After compacting in the corundum crucible, cover and seal it, raise the temperature in a muffle furnace at a rate of 100°C / min, keep it at a synthesis temperature of 850°C for 2 hours, then take it out and drop it to room temperature; After crushing and grinding, put it into a ball mill tank for secondary ball milling. The ball milling medium is water and zirconia balls. The weight ratio of material: balls: water is 2:1:1. Ball milling is carried out at a speed of 300 rpm for 12 hours. After...

Embodiment 2

[0035] Embodiment 2: Composition II by material:

[0036] [0.73(0.7PbZrO 3 -0.3K 0.5 Bi 0.5 TiO 3 )-0.27PbTiO 3 )+0.12PbZnNb 2 o 5 Carry out batching; sintering conditions are: first increase to 1220°C at a speed of 5°C / min, and after holding for 10 minutes, drop to 1100°C and hold for 20 minutes; polarization conditions are: in methyl silicone oil at 50°C, apply high-voltage DC voltage 2000V / mm, the polarization time is 30 minutes; the rest of the process is the same as in Example 1; the performance of the element tested after placing it for 48 hours is: relative permittivity ε 33 T =198,d 33 =102pC / N,d 31 =10pC / N,d 33 / d 31 =10.2, g h =41.4×10 -3 V·m / N.

Embodiment 3

[0037] Embodiment 3: Composition III by material

[0038] [0.70(0.7PbZrO 3 -0.3K 0.5 Bi 0.5 TiO 3 )-0.30PbTiO 3 ]+0.20PbZnNb 2 o 5 Carry out batching; the sintering condition is to first raise to 1200°C at a speed of 8°C / min, and then keep it warm for 10 minutes, then lower it to 1100°C and keep it for 30 minutes; the polarization condition is: in methyl silicone oil at 50°C, apply a high voltage DC voltage of 2000V / mm, the polarization time is 30 minutes; all the other processes are the same as in embodiment 1; the performance of the element tested after placing for 48 hours is: relative permittivity ε 33 T =240, d 33 =120pC / N,d 31 =28pC / N,d 33 / d 31 =4.3, gh=30×10 -3 V·m / N.

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Abstract

The invention provides an anisotropic piezoelectric material and a preparing method thereof. The composition chemical formula is as follows: [(1-x) (0.7PbZrO3 - 0.3K0.5Bi0.5TiO3) - xPbTiO3] + yPbZnNb2O5, x = 0.25 - 0.30, y = 0.01 - 0.20. The preparing method comprises the following preparing steps: mixing materials by a mass molar in the formula, ball-grinding by a wet method, briquetting after drying and synthesizing; synthesizing blocks after coarse grinding, carrying out secondary wet ball grinding, and pelletizing polyvinyl alcohol after drying; feeding degummed biscuits in an aluminum oxide crucible and sintering into ceramic; carrying out electrode oil bath polarization on the ceramic to obtain the anisotropic piezoelectric material. The material has high anisotropism, the piezoelectric strain coefficient in the polarization direction is larger than the piezoelectric coefficient in the non-polar direction, and the isostatic pressing piezoelectric sensitivity is as high as 40*10<-3> V.m / N and much higher than that of a lead zirconate titanate piezoelectric material. The material ingredients are reasonable and are easy to sinter and polarize, and the material is particularly suitable for manufacturing high-sensitivity and high-resolution hydrophones.

Description

technical field [0001] The invention relates to an anisotropic piezoelectric material and a preparation method thereof, more precisely, to a piezoelectric material for making high-sensitivity and high-resolution hydrophones and a preparation method thereof, belonging to the field of sensors. Background technique [0002] Materials science is the technical basis of underwater acoustic transducers and various acoustic functional devices. With the continuous discovery and utilization of new high-performance active or passive acoustic materials and new mechanisms, the development of underwater acoustic transducers and acoustic functional devices has been greatly promoted, and the replacement of these devices has been accelerated, and new replacements have emerged. Energy devices and functional devices. In recent years, with the development of stealth technology, the identification of underwater targets has become more and more difficult, and the development of high-sensitivity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/49C04B35/622
Inventor 温建强
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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