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A piezoelectric ceramic material with high Curie temperature and high temperature stability, its preparation method and application

A technology of piezoelectric ceramics and ceramic materials, applied in the field of materials science and engineering, can solve the problems of small resistivity, unfavorable device production, unfavorable device preparation and stable operation, and achieve the effect of improving piezoelectric performance and excellent temperature stability

Inactive Publication Date: 2019-09-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The CBN ceramic grains prepared by the template grain growth method have obvious orientation growth, so they can exhibit high-voltage electrical activity, but on the other hand, the resistivity of the orientation direction to obtain high-voltage electrical activity is usually small, which is not conducive to device make
Although ion doping modification can also significantly improve the piezoelectric properties of CBN ceramics (for example, K + 、La 3+ Ion-doped CBN ceramics, d 33 Up to ~15.8 pC / N), improve its high temperature resistivity, but usually the temperature stability of its piezoelectric properties is poor, which is not conducive to device preparation and stable operation

Method used

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  • A piezoelectric ceramic material with high Curie temperature and high temperature stability, its preparation method and application
  • A piezoelectric ceramic material with high Curie temperature and high temperature stability, its preparation method and application
  • A piezoelectric ceramic material with high Curie temperature and high temperature stability, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of bismuth yttrium niobate calcium lithium cerium ceramic powder by solid phase method

[0034] The raw materials were divided according to the general formula Ca 0.92 Li 0.04 Ce 0.03 Y 0.01 Bi 2 Nb 2 o 9 ( x =0.04, y =0.03, z =0.01, number 1 # ), Ca 0.92 Li 0.04 Ce 0.02 Y 0.02 Bi 2 Nb 2 o 9 ( x =0.04, y =0.02, z =0.02 number 2 # ) for weighing and batching, put it in a polyurethane ball mill tank, use absolute ethanol as the dispersion medium, and use a planetary ball mill for 24 hours after ball milling at a speed of 300rpm, bake it under a drying lamp for 2 hours to make it dry, and then control the temperature in the program The temperature was continuously raised to 850° C. in a box furnace, and kept for 3 hours to obtain bismuth yttrium niobate calcium lithium cerium ceramic powder.

[0035] (2) Secondary ball milling

[0036] The prepared bismuth yttrium niobate calcium lithium cerium ceramic powder was placed in a polyuretha...

Embodiment 2

[0044] (1) Preparation of bismuth yttrium niobate calcium lithium cerium ceramic powder by solid phase method

[0045] Raw material according to general formula Ca 0.92 Li 0.04 Y 0.04 Bi 2 Nb 2 o 9 ( x =0.04, y =0, z =0.04) for weighing and batching, put it in a polyurethane ball mill tank, use absolute ethanol as the dispersion medium, and use a planetary ball mill for 24 hours after ball milling at a speed of 300rpm, bake it under a drying lamp for 2 hours to make it dry, and then The temperature was continuously raised to 850° C. in a temperature-controlled box-type furnace and kept for 3 hours to obtain bismuth-yttrium-bismuth-calcium-lithium-cerium ceramic powder.

[0046] (2) Secondary ball milling

[0047] The prepared bismuth yttrium niobate calcium lithium cerium ceramic powder was placed in a polyurethane ball mill tank, with absolute ethanol as the dispersion medium, after ball milling with a planetary ball mill for 12 hours, the rotating speed was 300rpm, ...

Embodiment 3

[0055] (1) Preparation of bismuth yttrium niobate calcium lithium cerium ceramic powder by solid phase method

[0056] Raw material according to general formula Ca 0.92 Li 0.04 Ce 0.04 Bi 2 Nb 2 o 9 ( x =0.04, y =0.04, z =0) for weighing and batching, put it in a polyurethane ball mill tank, use absolute ethanol as the dispersion medium, and use a planetary ball mill for 24 hours after ball milling at a speed of 300rpm, bake it under a drying lamp for 2 hours to make it dry, and then The temperature was continuously raised to 850° C. in a temperature-controlled box-type furnace and kept for 3 hours to obtain bismuth-yttrium-bismuth-calcium-lithium-cerium ceramic powder.

[0057] (2) Secondary ball milling

[0058] The prepared bismuth yttrium niobate calcium lithium cerium ceramic powder was placed in a polyurethane ball mill tank, with absolute ethanol as the dispersion medium, after ball milling with a planetary ball mill for 12 hours, the rotating speed was 300rpm,...

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Abstract

The invention discloses a piezoelectric ceramic material with high Curie temperature and high temperature stability and its preparation method and application. It is characterized in that the ceramic material is formed by the general formula Ca 1‑x‑y‑z Li x Ce y Y z Bi 2 Nb 2 o 9 In the formula, 0≤ x ≤0.08, 0≤ ,y ≤0.15, 0≤ z ≤0.15, where, x represents the mole fraction of lithium, y Indicates the mole fraction of cerium, z Indicates the mole fraction of yttrium. The bismuth yttrium niobate calcium lithium cerium ceramic powder material is prepared by a solid phase method; and then the bismuth yttrium calcium lithium cerium piezoelectric ceramic is produced through granulation and tableting, debinding, sintering and polarization. The results of the silver test show that the crystal grains are relatively dense and uniform, which improves the sintering activity and has a high piezoelectric constant. d 33 , whose highest piezoelectric constant d 33 Up to 16.8pC / N. Bismuth yttrium niobate calcium lithium cerium ceramics have high high temperature resistivity (~5.9×10 6 Ω·cm, 500°C). Has good temperature stability and high Curie temperature (925 o C~941 o C).

Description

technical field [0001] The invention relates to a piezoelectric ceramic material with high Curie temperature and high temperature stability, its preparation method and application. Specifically, lithium, cerium, and yttrium elements are simultaneously doped into calcium bismuth niobate (CBN) high-temperature piezoelectric ceramic materials by means of donor doping and acceptor doping. It belongs to the field of materials science and engineering. 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 ceramic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187H01L41/37C04B35/495C04B35/622H10N30/092H10N30/853
CPCC04B35/495C04B35/622C04B2235/3298C04B2235/3229C04B2235/3225C04B2235/3203C04B2235/96H10N30/853H10N30/092
Inventor 陈强陈佳朱建国袁敬吴阳杰肖定全
Owner SICHUAN UNIV
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