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Piezoelectric ceramics and its preparation method, piezoelectric ceramic element and its preparation method

A piezoelectric ceramic element, piezoelectric ceramic technology, applied in the manufacture/assembly of electrical components, piezoelectric/electrostrictive/magnetostrictive devices, piezoelectric/electrostrictive devices, etc., can solve the difficult to meet the working environment temperature, lowering the Curie temperature of the system, etc.

Active Publication Date: 2020-02-07
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the Curie temperature of the undoped lead zirconate titanate ceramic material is only 380°C near the quasi-isomorphic phase boundary, the Curie temperature of the system will be further reduced by doping with donor and acceptor ions, making it difficult to meet the working environment temperature. Higher than 300℃ and above

Method used

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  • Piezoelectric ceramics and its preparation method, piezoelectric ceramic element and its preparation method
  • Piezoelectric ceramics and its preparation method, piezoelectric ceramic element and its preparation method
  • Piezoelectric ceramics and its preparation method, piezoelectric ceramic element and its preparation method

Examples

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Effect test

Embodiment A

[0029] A kind of piezoelectric ceramic of the present invention, its general chemical formula is: (Na 0.5 Bi 0.5 ) 1-a-b+c (Li 0.35 K 0.15 Ho 0.5 ) a (Li 0.35 K 0.15 Er 0.5 ) b Bi 4 Ti 4 o 15 , where 0.05≤a≤0.20, 0.05≤b≤0.20, 0≤c≤0.05.

[0030] A preparation method of the above-mentioned piezoelectric ceramics of the present embodiment, comprising the following steps:

[0031] (1) According to the general chemical formula (Na 0.5 Bi 0.5 ) 1-a-b+c (Li 0.35 K 0.15 Ho 0.5 ) a (Li 0.35 K 0.15 Er 0.5 ) b Bi 4 Ti 4 o 15 The stoichiometric ratio of the metal elements in 2 CO 3 (premium pure), Li 2 CO 3 (high purity), K 2 CO 3 (high purity), Bi 2 o 3 (high purity), TiO 2 (electronic grade), Ho 2 o 3 (high purity), Er 2 o 3 (high purity) put into a planetary ball mill jar made of nylon, use agate balls as a medium, deionized water or absolute ethanol as a dispersant, and ball mill for 18 hours. The ball-milled mixture is dried in a constant tempe...

Embodiment 1

[0037] A kind of piezoelectric ceramic of the present invention, its chemical formula is: (Na 0.5 Bi 0.5 ) 0.85 (Li 0.35 K 0.15 Ho 0.5 ) 0.1 (Li 0.35 K 0.15 Er 0.5 ) 0.05 Bi 4 Ti 4 o 15 .

[0038] A preparation method of the above-mentioned piezoelectric ceramics of the present embodiment, comprising the following steps:

[0039] (1) According to the chemical formula (Na 0.5 Bi 0.5 ) 0.85 (Li 0.35 K 0.15 Ho 0.5 ) 0.1 (Li 0.35 K 0.15 Er 0.5 ) 0.05 Bi 4 Ti 4 o 15 The stoichiometric ratio of the metal elements in 2 CO 3 (premium pure), Li 2 CO 3 (high purity), K 2 CO 3 (high purity), Bi 2 o 3 (high purity), TiO 2 (electronic grade), Ho 2 o 3 (high purity), Er 2 o 3 (high purity) put into a planetary ball mill jar made of nylon, use agate balls as a medium, deionized water or absolute ethanol as a dispersant, and ball mill for 18 hours. The ball-milled mixture is dried in a constant temperature oven at 80°C, the dried powder is put into an a...

Embodiment 2

[0045] A kind of piezoelectric ceramic of the present invention, its chemical formula is: (Na 0.5 Bi 0.5 ) 0.85 (Li 0.35 K 0.15 Ho 0.5 ) 0.075 (Li 0.35 K 0.15 Er 0.5 ) 0.075 Bi 4 Ti 4 o 15 .

[0046] A preparation method of the above-mentioned piezoelectric ceramic of this embodiment is basically the same as that of Example 2, the only difference being that in step (2), the amount of binder added is 8wt of the quality of the pre-sintered piezoelectric ceramic powder %, the molding pressure is 200MPa, the sintering temperature is 1150°C, and the sintering time is 2 hours.

[0047] A piezoelectric ceramic element of the present invention includes the piezoelectric ceramic of the present embodiment above, and metal electrodes formed on the piezoelectric ceramic.

[0048] The above-mentioned preparation method of the piezoelectric ceramic element of this embodiment is basically the same as that of Embodiment 2, the only difference being:

[0049] The polarization te...

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Abstract

The invention discloses a piezoelectric ceramic and a preparation method thereof, a piezoelectric ceramic element and a preparation method thereof. The main chemical formula of the piezoelectric ceramic is: (Na 0.5 Bi 0.5 ) 1‑a‑b+c (Li 0.35 K 0.15 Ho 0.5 ) a (Li 0.35 K 0.15 Er 0.5 ) b Bi 4 Ti 4‑x‑ y V x Mo y o 15 , where 0.05≤a≤0.20, 0.05≤b≤0.20, 0≤c≤0.05, 0≤x≤0.05, 0≤y≤0.05. The preparation method includes: (1) according to the stoichiometric ratio of the metal elements in the general formula of the main components, respectively weigh the corresponding metal oxides or metal salts, mix them, pre-ball mill, dry, and pre-sinter to obtain pre-sintered Piezoelectric ceramic powder; (2) ball milling and drying the pre-sintered piezoelectric ceramic powder, then adding binder, molding, plastic discharge, and sintering to obtain piezoelectric ceramics. The piezoelectric ceramic element prepared by the piezoelectric ceramic has the advantages of high Curie temperature, high piezoelectric constant, excellent piezoelectric performance and high temperature stability, and the like.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric ceramics and its preparation, and relates to a piezoelectric ceramic with high stability in a high-temperature environment and a preparation method thereof, a piezoelectric ceramic element and a preparation method thereof. Background technique [0002] Vibration is unavoidable in the operation of all mechanical equipment, and information such as the strength and frequency of vibration directly feeds back the working status of the equipment. Therefore, the measurement of vibration signals involves almost every engineering field. Among the many vibration signal measurement sensors, the piezoelectric accelerometer occupies most of the vibration measurement market because of its simple structure, no need for external power supply, no mechanical rotating parts, and long service life. In particular, for some aerospace, shipbuilding, and petrochemical energy fields, such as aviation turbofan engin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/63C04B41/88H01L41/187H01L41/43H10N30/097H10N30/853
CPCC04B35/475C04B35/6303C04B41/009C04B41/51C04B41/88C04B2235/3201C04B2235/3203C04B2235/3224C04B2235/3298C04B2235/3232C04B2235/602C04B2235/6567C04B2235/656C04B2235/77H10N30/8536H10N30/8561H10N30/097
Inventor 彭志航曹峰向阳
Owner NAT UNIV OF DEFENSE TECH
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