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Preparation method for 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 leadless piezoelectric ceramic

A lead-free piezoelectric and ceramic technology is applied in the field of preparation of 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 lead-free piezoelectric ceramics, achieving high thermal depolarization temperature, simple equipment and simple preparation process.

Inactive Publication Date: 2015-07-22
NANJING UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

There is currently no efficient way to increase the 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 Thermal depolarization temperature of piezoelectric ceramics until the thermal depolarization is eliminated

Method used

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  • Preparation method for 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 leadless piezoelectric ceramic
  • Preparation method for 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 leadless piezoelectric ceramic
  • Preparation method for 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 leadless piezoelectric ceramic

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Embodiment 1

[0024] (1), according to the chemical formula 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 : 0.3ZnO, weighing the dried single-phase 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 powder and ZnO powder, add alcohol to the mixture of the three powders, and then ball mill (320 rpm, 24 hours) to mix the powders evenly;

[0025] (2), after drying the powder mixture obtained in step (1), grind it with a mortar to make it uniform;

[0026] (3), adding alcohol to the powder mixture obtained in step (2), then ball milling (320 rpm, 24 hours) to further mix it evenly, and dry it;

[0027] (4), press the powder mixture obtained in step (3) into thin sheets with a pressure of 20MPa. The flakes are circular, with a diameter of 10mm±1mm and a thickness of 3mm±1mm, to facilitate the detection of the properties of ceramics;

[0028] (5), put the powder mixture obtained in step (3) into the crucible, put the flakes in again, and cover the flakes with the powder mixture obtained in step (3), so that th...

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Abstract

The invention discloses a preparation method for a 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 leadless piezoelectric ceramic. The method includes: mixing a single phase leadless piezoelectric material 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 powder and ZnO powder evenly, and performing sintering at 1000DEG C for 1.0h to obtain a 0-3 type composite leadless piezoelectric ceramic of 0.94Bi0.5Na0.5TiO3-0.06BaTiO3:xZnO (x=0, 0.1, 0.2, 0.4, with x being the mole percentage of ZnO relative to 0.94Bi0.5Na0.5TiO3-0.06BaTiO3). Specifically, ZnO exists in the substrate of 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 in the form of mutually independent particles. The thermal depolarization temperature of the composite piezoelectric ceramic increases along with the increase of ZnO concentration until thermal depolarization disappears. The equipment needed by the method and the preparation process are simple and practicable.

Description

technical field [0001] The present invention relates to a 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 A method for preparing lead-free piezoelectric ceramics. Background technique [0002] Bi 0.5 Na 0.5 TiO 3 Perovskite-based oxide materials have good piezoelectric properties at room temperature and are one of the lead-free piezoelectric materials with important application prospects. Constrain Bi 0.5 Na 0.5 TiO 3 The key issue for the practical application of lead-free piezoelectric ceramics is their thermal depolarization. For example, as Bi 0.5 Na 0.5 TiO 3 A typical representative of lead-free piezoelectric ceramics, Bi 0.5 Na 0.5 TiO 3 -BaTiO 3 Its piezoelectricity begins to weaken at about 50°C, so its piezoelectric coefficient decreases rapidly as the temperature increases. There is currently no efficient way to increase the 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 The thermal depolarization temperature of piezoelectric ceramics until the thermal depolariza...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/622
Inventor 张善涛张骥卢明辉陈延彬陈延峰
Owner NANJING UNIV
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