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Preparation method and application of lead-free piezoelectric barium titanate-based textured ceramics with high electrical properties

A technology of electrical properties and electric barium titanate, applied in the field of piezoelectric ferroelectric materials, can solve the problems of increased strain hysteresis and Curie temperature deterioration of the system ceramics

Active Publication Date: 2019-07-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention will solve the problem that the improvement of existing barium titanate-based ceramics makes the strain hysteresis H of the system ceramics s become larger, although some electrical performance parameters of barium titanate-based ceramics have been improved to a certain extent, but another part of its performance parameters, such as the Curie temperature T c However, the problem of being exacerbated, while providing lead-free piezoelectric barium titanate-based textured ceramics with high electrical performance and its preparation method and application

Method used

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  • Preparation method and application of lead-free piezoelectric barium titanate-based textured ceramics with high electrical properties
  • Preparation method and application of lead-free piezoelectric barium titanate-based textured ceramics with high electrical properties
  • Preparation method and application of lead-free piezoelectric barium titanate-based textured ceramics with high electrical properties

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specific Embodiment approach 1

[0059] Embodiment 1: The general chemical formula of the lead-free piezoelectric barium titanate-based textured ceramics with high electrical performance described in this embodiment is (Ba 1-x Ca x )(Ti 1-y Zr y )O 3, wherein, 0.01 ≤ x ≤ 0.12, 0.02 ≤ y ≤ 0.08; the lead-free piezoelectric barium titanate-based textured ceramics with high electrical performance are grown directional by using a flaky microcrystalline template, and the flaky microcrystalline template The molar ratio of lead-free piezoelectric barium titanate-based textured ceramics with high electrical performance is w:1, wherein, 0.01≤w≤0.15; the flaky microcrystalline template is BaTiO 3 , CaTiO 3 or (Ba 0.85 Ca 0.15 )TiO 3 ;

[0060] The lead-free piezoelectric barium titanate-based textured ceramics with high electrical performance is an engineering domain configuration of 4O, 4R or a mixture of 4O and 4R, along the [001] c The degree of orientation is above 95%, the Curie temperature is above 90°C, ...

specific Embodiment approach 2

[0063] Embodiment 2: The preparation method of the lead-free piezoelectric barium titanate-based textured ceramics with high electrical performance described in this embodiment is completed according to the following steps:

[0064] 1. Using template grain oriented growth technology to prepare along [001] c Highly oriented lead-free piezoelectric barium titanate-based textured ceramics:

[0065] 1. Using template grain oriented growth technology to prepare along [001] c Highly oriented lead-free piezoelectric barium titanate-based textured ceramics:

[0066] (1) Preparation of BCTZ-based fine-grain matrix powder:

[0067] The flaky microcrystalline template is selected according to the molar ratio of the flaky microcrystalline template and the lead-free piezoelectric barium titanate-based textured ceramics with high electrical performance as w: 1, wherein, 0.01≤w≤0.15, the flaky microcrystalline The crystal template is BaTiO 3 , CaTiO 3 or (Ba 0.85 Ca 0.15 )TiO 3 ;

...

specific Embodiment approach 3

[0105] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the TiO described in step one (1) 2 Particle size2 The particle size is <100nm. Others are the same as in the second embodiment.

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Abstract

The invention discloses lead-free piezoelectric barium titanate-based textured ceramic with high electrical properties as well as a preparation method and application thereof, relates to the field of piezo-ferroelectric materials, and aims at solving the problems that strain hysteresis Hs of system ceramic is increased by improving existing barium titanate-based ceramic; and even if a part of electrical property parameters of the titanate-based ceramic are improved to a certain degree, the other part of property parameters such as Curie temperature Tc are deteriorated. A chemical general formula is (Ba1-xCax) (Ti1-yZry)O3, wherein x is greater than or equal to 0.01 and smaller than or equal to 0.12, and y is greater than or equal to 0.02 and smaller than or equal to 0.08. The method comprises the following steps: preparing lead-free piezoelectric barium titanate-based textured ceramic along the [001]c height direction by adopting a templated grain oriented growth technology; and secondly, preparing the lead-free piezoelectric barium titanate-based textured ceramic with the high electrical properties by adopting an engineering domain technology. The lead-free piezoelectric barium titanate-based textured ceramic is applied to the fields of piezoelectric actuators, piezoelectric sensors and ultrasonic transducers with high sensitivity and high accuracy.

Description

technical field [0001] The invention relates to the field of piezoelectric ferroelectric materials. Background technique [0002] Piezoelectric ceramics is a functional ceramic material that can convert mechanical energy and electrical energy. It can be used as drivers, sensors, transducers, resonators and filters, etc. Energy and other high-tech fields. At present, Pb(Zr,Ti)O is the most widely used and dominates the piezoelectric ceramic material market. 3 (abbreviated as PZT) based polycrystalline material. However, PbO (or Pb 3 o 4 ) accounts for more than 70% of the total mass of raw materials, causing harm to human health and the ecological environment during production, use and disposal. Therefore, the use of lead-free piezoelectric ceramic materials to replace traditional lead-based piezoelectric materials has become an inevitable trend in the development of piezoelectric ceramics, and the development of a new generation of lead-free piezoelectric ceramic materi...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622C04B35/638B28B1/29B28B1/00B28B11/24B28B11/00
CPCB28B1/002B28B1/29B28B11/00B28B11/243C04B35/4682C04B35/622C04B35/638C04B2235/3208C04B2235/3248C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/96
Inventor 常云飞刘迎春孙媛吴杰杨彬曹文武
Owner HARBIN INST OF TECH