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A kind of piezoelectric ceramic material for high temperature piezoelectric sensor and preparation method thereof

A piezoelectric ceramic, high-temperature piezoelectric technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problem of affecting the temperature of high-temperature piezoelectric sensors Problems such as stability, unfavorable stability of high-temperature piezoelectric sensors, and decrease of Curie temperature achieve the effect of high-temperature DC resistivity, high-voltage electrical activity, and piezoelectricity increase

Active Publication Date: 2020-07-31
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although bismuth layered ferroelectrics have a high Curie temperature, their piezoelectricity is poor due to their special crystal structure that confines their spontaneous polarization to a two-dimensional plane.
Although people can effectively enhance its piezoelectric activity through ion doping or preparation process improvement, with the introduction of doping ions, the Curie temperature usually decreases significantly, and the high-temperature resistivity ρ (@650 ℃) Usually less than 10 5 The magnitude of Ω·cm will seriously affect the temperature stability of high-temperature piezoelectric sensors
[0004] Ca Bi 2 Ta 2 o 9 (CBTa) is a typical bismuth-containing layered piezoelectric material, which consists of a perovskite-like layer (CaTa 2 o 7 ) 2- and (Bi 2 o 2 ) 2+ Layers are regularly arranged alternately, and the Curie temperature is as high as 940 ℃, but its piezoelectricity is still very low, and the piezoelectric constant d 33 Only 4 pC / N, with a resistivity of ~10 at 650 °C 5 Ω·cm, and piezoelectric constant d 33 The attenuation is obvious with the increase of temperature, which is not conducive to the improvement of the stability of high-temperature piezoelectric sensors

Method used

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  • A kind of piezoelectric ceramic material for high temperature piezoelectric sensor and preparation method thereof
  • A kind of piezoelectric ceramic material for high temperature piezoelectric sensor and preparation method thereof
  • A kind of piezoelectric ceramic material for high temperature piezoelectric sensor and preparation method thereof

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preparation example Construction

[0027] A piezoelectric ceramic material for high-temperature piezoelectric sensors with high Curie temperature, high-voltage electrical activity, high-temperature DC resistivity, and good temperature stability, and its preparation, characterized in that: the chemical composition of the ceramic material The ratio is: Ca 1-x-y-z (LM) x / 2 N y (NaBi) z / 2 Bi 2 Ta 2 O 9 ; Wherein L represents Li, Na, K; M represents lanthanide metal element or Bi; N represents Sr or +2 valence vacancy; x, y, z Represents the mole fraction of the corresponding element. Where 0 ≤ x + y + z ≤ 1, and 0 ≤ x ≤ 0.4, 0 ≤ y ≤ 0.1, 0 ≤ z ≤ 1; when z ≠ 0, the (LM) combination cannot be (NaBi). The preparation method includes the following steps:

[0028] (1) Calculate and weigh the required quality of each raw material according to the chemical ratio formula of the ceramic materials;

[0029] (2) Ball mill the weighed raw materials for 10-24 h;

[0030] (3) Bake the slurry after ball milling in step (2), pierce a ...

Embodiment 1

[0038] (1) Preparation of high Curie temperature piezoelectric ceramic powder by solid phase method

[0039] According to the general formula Ca 1-x (LiCe) x / 2 Bi 2 Ta 2 O 9 ( x = 0, 0.06) to calculate the formula, weigh and mix the raw materials in the stoichiometric ratio, put them in a polyurethane ball milling tank, use anhydrous ethanol as the dispersion medium, and use a planetary ball mill for 16 h at a speed of 180 rpm. Then discharge the material, bake it under a baking lamp until it is dried, and then continuously increase the temperature to 850 ℃ in a program-controlled temperature box furnace and keep it for 4 hours to obtain a high Curie temperature piezoelectric ceramic powder;

[0040] (2) Secondary ball milling

[0041] Put the prepared high Curie temperature piezoelectric ceramic powder in a polyurethane ball milling tank, use anhydrous ethanol as the dispersion medium, ball mill with a planetary ball mill for 12 hours, rotate at 180 rpm, and then discharge the mater...

Embodiment 2

[0049] (1) Preparation of high Curie temperature piezoelectric ceramic powder by solid phase method

[0050] According to the general formula Ca 1-z (NaBi) z / 2 Bi 2 Ta 2 O 9 ( z = 0.10, 0.30, 0.50) to calculate the formula, weigh and mix the raw materials in the stoichiometric ratio, put them in a polyurethane ball mill tank, use anhydrous ethanol as the dispersion medium, and use a planetary ball mill for 16 h after ball milling at a speed of 180 rpm, followed by discharging, baking under a bake lamp until drying, and then continuously heating to 850 ℃ in a program-controlled temperature box furnace for 4 hours to obtain high Curie temperature piezoelectric ceramic powder;

[0051] (2) Secondary ball milling

[0052] Put the prepared high Curie temperature piezoelectric ceramic powder in a polyurethane ball milling tank, use anhydrous ethanol as the dispersion medium, ball mill with a planetary ball mill for 12 hours, rotate at 180 rpm, and then discharge the material and bake it un...

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Abstract

The invention provides a piezoelectric ceramic material used for a high-temperature piezoelectric sensor and a preparation method thereof. The chemical ratio formula of the ceramic material is: Ca 1‑x‑y‑z (LM) x / 2 N y (NaBi) z / 2 Bi 2 Ta 2 o 9 ; The chemical proportion formula of this ceramic material is: Ca 1‑x‑y‑z (LM) x / 2 N y (NaBi) z / 2 Bi 2 Ta 2 o 9 ; where L represents Li, Na, K; M represents lanthanide metal elements or Bi; N represents Sr or +2 valence vacancies; where 0≤ x + y + z ≤1, and 0≤ x ≤0.4, 0≤ y ≤0.1, 0≤ z ≤1; when z≠0, the combination of (LM) cannot be (NaBi). The piezoelectric ceramic material of the invention has the advantages of high Curie temperature, high high-temperature DC resistivity, good piezoelectric activity and good thermal stability.

Description

Technical field [0001] The invention relates to the technical field of materials, in particular to a piezoelectric ceramic material for high-temperature piezoelectric sensors and a preparation method thereof. Background technique [0002] Piezoelectric ceramics is an important new functional material that can realize the mutual conversion of mechanical energy and electrical energy. It has been widely used in many fields such as aerospace, automobiles, communications, and consumer electronics. Lead-based piezoelectric ceramics represented by lead zirconate titanate (PZT) are currently the most widely used piezoelectric ceramic materials due to their excellent piezoelectric and dielectric properties. With the development and progress of science and technology, some high-tech fields, such as aerospace, navigation, nuclear energy, geological exploration, etc., put forward urgent and demanding application requirements for piezoelectric ceramics, requiring piezoelectric ceramics to wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/495C04B35/622H01L41/187H01L41/333H01L41/43H10N30/084H10N30/097H10N30/853
CPCC04B35/01C04B35/495C04B35/622C04B2235/3298C04B2235/3201C04B2235/3208C04B2235/3215C04B2235/3213C04B2235/3227H10N30/8561H10N30/084H10N30/097
Inventor 陈强钟建强朱建国
Owner SICHUAN UNIV
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