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Ferroelectric ceramic with low-temperature sintering characteristic and its technique and application

A technology of low-temperature sintering and ferroelectric ceramics, applied in the field of materials science, can solve the problems of reducing the piezoelectric performance of materials and their devices, small chemical uniformity and grain size, reducing PZT chemical ratio, etc., to reduce energy consumption and Cost, improve product quality, reduce the effect of volatilization

Inactive Publication Date: 2012-02-29
TONGJI UNIV
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Problems solved by technology

At present, in the manufacturing process of high-temperature co-fired (HTCC, sintering temperature higher than 1200°C) multilayer structure piezoelectric drive devices, due to the high sintering temperature, the interaction between the internal electrode material Pd or Ag-Pd and PZT ceramics leads to relatively low Small chemical uniformity and grain size, which reduces the stoichiometry of PZT, leading to poor driver performance (Ref. 5)
In the process of making multilayer piezoelectric driving devices in LTCC, the addition of low-melting non-ferroelectric glass phases or compounds reduces the sintering temperature of piezoelectric ceramics, but also greatly reduces the piezoelectricity of materials and devices. Performance (Reference 6)

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  • Ferroelectric ceramic with low-temperature sintering characteristic and its technique and application
  • Ferroelectric ceramic with low-temperature sintering characteristic and its technique and application
  • Ferroelectric ceramic with low-temperature sintering characteristic and its technique and application

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Embodiment Construction

[0041] 1. 0.25BiCrO 3 -0.30BiFeO 3 -0.45PbTiO 3 (BCFPT) ferroelectric ceramic preparation: the Bi 2 o 3 , Cr 2 o 3 , Fe 2 o 3 , PbO and TiO 2 The oxide powder is weighed according to the stoichiometric ratio, added with absolute ethanol and ground in an agate mortar for 2 hours; uniaxial stress molding, molding pressure 250MPa, green body diameter 10mm; green sheet is sintered at 1000°C for 5 hours. The shrinkage rate of the sintered ceramic sheet is greater than 10%, and the density measured by the Archimedes method is 7.7g / cm 3 . X-ray diffraction measurement BCF-PT is a pseudocubic perovskite structure, the test results are shown in figure 2 .

[0042] 2. PZT ceramic molding and sintering: The PZT ceramic powder used in this embodiment is provided by Shanghai Institute of Ceramics (SIC), and BCFPT is the mixed raw material used in Example 1; according to (1-z)PZT-z(BCFPT) Proportional weighing, z=3mol%, 5mol%, 7.5mol%, 10mol%, 12.5mol% and 15mol%; add absolute ...

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Abstract

The invention relates to a ferroelectric ceramic with low-temperature sintering property, utilizes ferroelectric ceramic materials with low-temperature sintering property as sintering additives, employs the conventional solid-phase ceramic process, and realizes the non-pressure low-temperature (100 DEG C) sintering of lead zirconate titanate piezoelectric ceramics for commercial purpose and modification in piezoelectric property. The non-pressure low-temperature sintered piezoelectric ceramic sheet, PbZr1-xTixO3-BiCrO3-BiFeO3-PbTiO3, has a single-phase perovskite structure and exhibits 'hardness' piezoelectric property compared with the piezoelectric ceramic powder for commercial purpose and the ceramic sheet made by the conventional sintering process. The inventive ferroelectric ceramic is particularly suitable for the fabrication of functional devices such as emission piezoelectric ceramic devices, low-temperature cofired multi-layer piezoelectric ceramic drivers, transformers, transducers.

Description

technical field [0001] The invention belongs to the field of material science, and relates to a pressureless low-temperature sintered PZT piezoelectric ceramic material and device preparation technology. Background technique [0002] PZT piezoelectric ceramic is an important functional material and intelligent material, which is widely used in electronic components, micro-displacement control, micro-ultrasonic motor and other fields. Due to the characteristics of high Curie temperature, strong piezoelectricity, easy doping modification, and good stability, PZT ceramics still occupy a dominant position in the field of piezoelectric ceramic materials and devices. For example, PZT ceramic filters and SAW filters constitute key components in modern wireless communication technology --- medium, high frequency and microwave filters. The use of low loss, high dielectric constant ceramics in RF and IF filters enables the miniaturization of wireless devices. PZT ceramic drivers, in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/462C04B35/12H03H9/54H03H9/64H01L41/08H01L41/187H10N30/00H10N30/853
Inventor 于剑
Owner TONGJI UNIV
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