Bismuth-sodium titanate-bismuth potassium titanate barium zirconate titanate lead free piezoelectric ceramics

A technology of bismuth potassium titanate and barium zirconate titanate, which is applied in the field of bismuth sodium titanate-bismuth potassium titanate-barium zirconate titanate lead-free piezoelectric ceramics, can solve the problem of lead-free piezoelectric ceramics preparation and performance that have not been reported and other problems, to achieve the effect of excellent piezoelectric ferroelectric performance, excellent piezoelectric ferroelectric performance, and process stability

Inactive Publication Date: 2006-01-04
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the preparation and performance of the BNT-BKT-BZT ternary system lead-free piezoelectric ceramics have not been reported yet.

Method used

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  • Bismuth-sodium titanate-bismuth potassium titanate barium zirconate titanate lead free piezoelectric ceramics
  • Bismuth-sodium titanate-bismuth potassium titanate barium zirconate titanate lead free piezoelectric ceramics
  • Bismuth-sodium titanate-bismuth potassium titanate barium zirconate titanate lead free piezoelectric ceramics

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Embodiment

[0014] According to 0.9((1-z)Bi 1 / 2 Na 1 / 2 TiO 3 -zBi 1 / 2 K 1 / 2 TiO 3 )-0.1Ba(Zr y Ti1-y )O 3 The theoretical content of the ratio, referring to the MPB position of BNT-BKT, using Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 、K 2 CO 3 、TiO 2 and ZrO 2 Analytical pure powder raw materials, according to the composition shown in Table 1, specifically according to the weight of each group shown in Table 3, after accurate weighing, the groups are ball milled with anhydrous ethanol as the ball milling medium, dried at 70°C, and pressed into discs, at 800-950°C Synthesize at ℃ temperature for 2 hours, sieve 200 meshes, add 0.5-1.5ml of 3wt% PVA solution per 10g of mixture as binder, press under 150MPa pressure to form 10mm in diameter and 1-1.5mm in thickness Discs were incubated at 1150°C for 3h. The fired samples were polished and covered with silver electrodes. The fired samples were polarized at 4kV / mm in silicone oil at 80°C. After 20 minutes of polarization, the electric field ...

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Abstract

The present invention discloses a kind of environment friendly lead-free bismuth sodium titanate-bismuth potassium tatanate-barium zirconate titanate piezoelectric ceramic in functional ceramic preparing technology. The lead-free piezoelectric ceramic has the general expression of (1-x)Bi1 / 2(Na1-zKz)1 / 2TiO3-xBa(ZryTi1-y)O3, where, x is BZT molar content, y is atom number of Zr to replace Ti in BaTiO3, z is atom number of K to replace Na in BaNaO3, x is 0-0.1, y is 0-0.10 and z is 0-0.05. The lead-free piezoelectric ceramic may be prepared with industrial materials and through traditional piezoelectric ceramic preparing technological process. The lead-free piezoelectric ceramic has d33 up to 16pC / N, Curie temperature up to 270 deg c and practical application value.

Description

technical field [0001] The invention belongs to the technical field of functional ceramic preparation. In particular, the invention relates to a kind of lead-free piezoelectric ceramics of sodium bismuth titanate-potassium bismuth titanate-barium zirconate titanate with calcium state ore structure and environment coordination. Background technique [0002] Piezoelectric ceramics are an important class of high-tech new materials with fierce international competition. They are widely used in high-tech fields such as information, laser, navigation, and biology. However, the piezoelectric ceramics used on a large scale are mainly lead-based piezoelectric ceramics. , that is, PbTiO 3 -PbZrO 3 , PbT i o 3 -PbZrO 3 -ABO 3 (ABO 3 is a composite perovskite ferroelectric) and PbTiO 3 Piezoelectric ceramics, etc. PbO (or Pb 3 o 4 ) content about 70%. Lead-based piezoelectric materials will bring serious harm to human beings and the ecological environment in the process of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/468C04B35/622
Inventor 李龙土李恩竹褚祥诚
Owner TSINGHUA UNIV
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