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Tin barium titanate calcium leadless piezoelectric ceramic and preparation technology thereof

A technology based on lead-free piezoelectric and barium tin titanate is applied in the field of lead-free piezoelectric materials, which can solve the problems of poor temperature stability and poor piezoelectric performance of lead-free piezoelectric ceramics, and achieve good temperature stability performance, The effect of good temperature stability and good application prospects

Inactive Publication Date: 2013-06-12
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor piezoelectric performance and poor temperature stability of lead-free piezoelectric ceramics, and provide a BCT-BST binary ceramic powder (lead-free piezoelectric ceramic powder based on barium calcium titanate tin body) and the preparation process of its ceramics, which not only have good piezoelectric properties, but also have excellent temperature stability

Method used

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  • Tin barium titanate calcium leadless piezoelectric ceramic and preparation technology thereof
  • Tin barium titanate calcium leadless piezoelectric ceramic and preparation technology thereof

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Experimental program
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Effect test

Embodiment 1

[0017] Embodiment one: The formula of this embodiment is Ba 1-x Ca x Ti 0.95 sn 0.05 o 3 ,in x =0.

[0018] Weigh raw materials according to the stoichiometric ratio of the formula: BaCO 3 , CaCO 3 , TiO 2 , SnO 2 . The so-called raw material powder is ball milled with deionized water as the medium for 10 hours, and the slurry obtained by ball milling is kept at 80°C for 8 hours. After drying the powder, it is pre-calcined at 1100°C for 4 hours to obtain BaTi 0.95 sn 0.05 o 3 Powder; add 5 wt% PVB to granulate, and press it into a disc with a diameter of 12mm and a thickness of 1mm under a pressure of 100MPa; after the ceramic body is fully degummed, it is sintered at 1400°C in air for 4 hours to prepare tin-titanium Barium calcium oxide based ceramics.

[0019] The obtained lead-free barium tin titanate-based piezoelectric ceramics were cleaned by silver electrodes after ultrasonic cleaning. At room temperature, it was polarized in silicone oil at 2kV / mm for 20m...

Embodiment 2

[0021] Embodiment two: The formula of this embodiment is Ba 1-x Ca x Ti 0.95 sn 0.05 o 3 ,in x =0.01.

[0022] Weigh raw materials according to the stoichiometric ratio of the formula: BaCO 3 , CaCO 3 , TiO 2 , SnO 2 . The so-called raw material powder is ball milled with deionized water as the medium for 10 hours, and the slurry obtained by ball milling is kept at 80°C for 8 hours. After drying the powder, it is pre-calcined at 1120°C for 4 hours to obtain Ba 0.99 Ca 0.01 Ti 0.95 sn 0.05 o 3 Powder; add 5 wt% PVB to granulate, and press it into a disc with a diameter of 12 mm and a thickness of 1 mm under a pressure of 100 MPa; after fully debinding the ceramic body, sinter it in air at 1430 ° C for 4 hours to prepare tin titanium Barium calcium oxide based ceramics.

[0023] The obtained lead-free barium tin titanate-based piezoelectric ceramics were cleaned by silver electrodes after ultrasonic cleaning. At room temperature, it was polarized in silicone oi...

Embodiment 3

[0025] Embodiment three: The formula of this embodiment is Ba 1-x Ca x Ti 0.95 sn 0.05 o 3 ,in x =0.02.

[0026] Weigh raw materials according to the stoichiometric ratio of the formula: BaCO 3 , CaCO 3 , TiO 2 , SnO 2 . The so-called raw material powder is ball milled with deionized water as the medium for 10 hours, and the slurry obtained by ball milling is kept at 80°C for 8 hours. After drying the powder, it is pre-calcined at 1130°C for 4 hours to obtain Ba 0.98 Ca 0.02 Ti 0.95 sn 0.05 o 3 Powder; add 5 wt% PVB to granulate, and press it into a disc with a diameter of 12 mm and a thickness of 1 mm under a pressure of 100 MPa; after fully debinding the ceramic body, sinter it in air at 1440 ° C for 4 hours to prepare tin titanium Barium calcium oxide based ceramics.

[0027] The obtained lead-free barium tin titanate-based piezoelectric ceramics were cleaned by silver electrodes after ultrasonic cleaning. At room temperature, it was polarized in silicone ...

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Abstract

The invention relates to tin barium titanate calcium leadless piezoelectric ceramic with excellent piezoelectric property and good temperature stability. The tin barium titanate calcium leadless piezoelectric ceramic is characterized by comprising a material (Ba[1-x]Cax)(Ti0.95Sn0.05)O3, wherein x is 0-0.07; in a component interval of 0.01-0.06, the the piezoelectric constant d33 of the ceramic of the system is more than 4000pC / N; the electromechanical coupling coefficient kp of the the piezoelectric constant d33 is more than 41%, so the performance of the traditional piezoelectric ceramic containing lead is achieved; in addition, the piezoelectric constant d33 of the ceramic and the electromechanical coupling coefficient kp have good temperature stability; the piezoelectric constant d33 and the electromechanical coupling coefficient kp can respectively achieve over 3000pC / N and 30% when x is 0.01-0.06; and the tin barium titanate calcium leadless piezoelectric ceramic displays that the material has good application prospect.

Description

technical field [0001] The invention belongs to the field of lead-free piezoelectric materials, in particular to a lead-free piezoelectric ceramic of barium calcium titanate-barium tin titanate (BCT-BST) binary system and its preparation process, and a piezoelectric ceramic device containing the composite . Background technique [0002] In recent years, for the protection of human health and the natural environment, scholars have devoted themselves to finding alternatives to toxic lead-based piezoelectric materials. (Ba,Ca)(Ti,Sn)O prepared by traditional solid-phase synthesis method discovered by Ren Xiaobing et al. 3 The piezoelectric ceramics of the system have abnormal performance at the optimal composition, and the piezoelectric constant d 33 =530 pC / N, relative permittivity ε at room temperature r =3800 (Dezhen Xue, Yumei Zhou, Huixin Bao, Jinghui Gao, Chao Zhou et al, Large piezoelectric effect in Pb-free Ba(Ti,Sn)O 3 -x(Ba,Ca)TiO 3 ceramics, Appl. Phys. Lett. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 徐志军陈明丽初瑞清李艳姬万滨马帅
Owner LIAOCHENG UNIV
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