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A piezoelectric ceramic material for high temperature environment application and its preparation method

A technology of piezoelectric ceramics and high-temperature environment, which is applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., which can solve the problems of unfavorable sensor stable operation, poor piezoelectric performance temperature stability, and sensor temperature response characteristics Variation and other problems, to achieve the effects of ferroelectric properties, enhanced tetragonality, and improved electrical properties

Active Publication Date: 2020-05-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive leakage current will deteriorate the temperature response characteristics of the sensor, which is not conducive to the stable operation of the sensor
Although ion doping can usually significantly improve the piezoelectric properties of CBN ceramics (for example, Na + 、Ce 3+ Ion-doped CBN ceramics, d 33 ~16pC / N), to a certain extent, improve the high temperature resistivity of ceramics, for example, by K + , La 3+ Ion-doped CBN ceramics, at 600 ° C, the DC resistivity ρ ~ 10 5 Ω cm, but usually the temperature stability of its piezoelectric properties is poor, and the resistivity changes with temperature at high temperature usually shows that the resistivity value decreases by an order of magnitude when the temperature rises by 50 ° C. The higher the temperature, the resistivity The higher the degree of reduction

Method used

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  • A piezoelectric ceramic material for high temperature environment application and its preparation method
  • A piezoelectric ceramic material for high temperature environment application and its preparation method
  • A piezoelectric ceramic material for high temperature environment application and its preparation method

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preparation example Construction

[0030] A CBN-based high-temperature piezoelectric ceramic material with high Curie temperature, high high-temperature direct-current resistivity, good piezoelectric activity, and good thermal stability, which is oriented to high-temperature environments and a preparation method thereof, is characterized in that: the ceramic material The stoichiometric formula is Ca 0.8-δ Sr δ Bi 2 Nb 2-x-y Ta x W y o 9 +z wt% Li 2 CO 3 +w wt% Bi 2 o 3 +q wt% M, where M is a metal oxide, including but not limited to CeO 2 ,ZnO,Al 2 o 3 ,La 1.2 Ce 0.8 Ti 2 o 7 ,LiAlSiO 4 etc., 0≤δ≤0.2, 02 CO 3 、 Bi 2 o 3and metal oxide M added to the ceramic, the low melting point Li 2 CO 3 、 Bi 2 o 3 As a liquid-phase sintering agent, the metal oxide is used as a sintering aid to promote ceramic sintering to obtain a dense ceramic body. Its specific preparation method comprises the following steps:

[0031] (1) Calculate the required quality of each raw material according to the chemica...

Embodiment 1

[0047] (1) Preparation of CBN-based piezoelectric ceramic powder by solid phase method

[0048] According to Ca 0.775 Sr 0.025 Bi 2 Nb 1.94 Ta 0.04 W 0.02 o 9 +0.45wt%Li 2 CO 3 +1.99wt% Bi 2 o 3 +0.63wt%CeO 2 (M=CeO 2 , δ = 0.025, x = 0.04, y = 0.02, z = 0.45, w = 1.99, q = 0.63, number 1#), accurately weigh the corresponding mass of powder according to the stoichiometric ratio. Put the weighed medicine in a nylon tank, use absolute ethanol as the dispersion medium, use a planetary ball mill ball for 24 hours, and the rotation speed is 200rpm, bake the slurry for 1-4 hours with a drying lamp or an oven, and then put it into a program temperature control box The temperature was continuously raised to 850°C in the furnace, and kept for 4 hours to obtain CBN-based piezoelectric ceramic powder;

[0049] (2) Secondary ball milling

[0050] Put the obtained CBN-based piezoelectric ceramic powder in a nylon tank, use absolute ethanol as the dispersion medium, and use a ...

Embodiment 2

[0058] (1) Preparation of CBN-based piezoelectric ceramic powder by solid phase method

[0059] According to Ca 0.79 Sr 0.01 Bi 2 Nb 1.94 Ta 0.04 W 0.02 o 9 +0.45wt%Li 2 CO 3 +1.99wt% Bi 2 o 3 +0.3wt%Al 2 o 3 (M=Al 2 o 3 , δ = 0.01, x = 0.04, y = 0.02, z = 0.45, w = 1.99, q = 0.3, code 2#), according to the stoichiometric ratio, accurately weigh the corresponding mass of powder. Put the weighed medicine in a polyurethane ball mill tank, use absolute ethanol as the dispersion medium, use a planetary ball mill ball for 24 hours, and the rotation speed is 200rpm, bake the slurry with a drying lamp or oven for 1-4 hours, and then put it into a program temperature control box The temperature was continuously raised to 850°C in a type furnace and kept for 4 hours to obtain CBN-based piezoelectric ceramic powder;

[0060] (2) Secondary ball milling

[0061] Put the obtained CBN-based piezoelectric ceramic powder in a polyurethane ball mill tank, use absolute ethanol a...

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Abstract

The invention provides a piezoelectric ceramic material applied to a high-temperature environment and a preparation method of the piezoelectric ceramic material. A chemical ratio formula of the ceramic material is as follows: Ca0.8-deltaSrdeltaBi2Nb2-x-yTaxWyO9 + z wt% Li2CO3 + w wt% Bi2O3 + q wt% M, wherein M is a metal oxide, and in the formula, value ranges of delta, x, y, z, w and q satisfy the relationships of 0 <= delta <= 0.2, 0 < x <= 1, 0 < y <= 0.5, 0 < z < 2, 0 < w < 10, and 0 < q <= 5. The piezoelectric ceramic material provided by the inventions has the advantages of high Curie temperature, high high-temperature direct-current electrical resistivity, good piezoelectric activity and good thermal stability.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a piezoelectric ceramic material for high-temperature environment applications and a preparation method thereof. Background technique [0002] Piezoelectric ceramics can be made into transducers, sensors, and detectors because of their positive and negative piezoelectric effects, and have been widely used in various fields of modern industry and national defense. With the development of modern science and technology and modern industry, some fields such as metallurgy, aerospace, petrochemical industry, etc., require piezoelectric ceramics to be able to work stably in high temperature and harsh environments, which requires piezoelectric ceramics to have high Curie temperature, good high temperature resistivity and good temperature stability characteristics. Although traditional lead zirconate titanate (PZT) piezoelectric ceramics have excellent piezoelectric properties, their C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/495C04B35/64C04B41/88
CPCC04B35/495C04B35/64C04B41/5116C04B41/88C04B2235/3203C04B2235/3208C04B2235/3213C04B2235/3217C04B2235/3229C04B2235/3258C04B2235/3284C04B2235/3298
Inventor 陈强谢娟钟建强吴超石钰琳王丹朱建国
Owner SICHUAN UNIV
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