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Sodium potassium niobate-sodium bismuth zirconate titanate lead-free piezoelectric ceramic

A bismuth sodium zirconate titanate-based, lead-free piezoelectric technology is applied in the field of potassium sodium niobate-bismuth sodium zirconate titanate lead-free piezoelectric ceramics, which can solve the problem of high material cost and hinder the practical application of lead-free piezoelectric ceramics. process and other issues, to achieve the effect of low price, promotion of practical process, and high-voltage electrical performance

Inactive Publication Date: 2013-09-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on KNN-based lead-free piezoelectric ceramics is mainly focused on reducing its orthorhombic-tetragonal phase transition temperature, constructing an orthorhombic-tetragonal phase boundary near room temperature, and introducing expensive rare earth metals such as Ta into the B site to form [(K u Na v ) 1-z Li z ][Nb α Sb β Ta γ ]O 3 , the piezoelectric coefficient can be increased to 200~300 pC / N, which makes the cost of alkali metal niobate-based lead-free piezoelectric ceramic materials expensive, which seriously hinders the practical process of lead-free piezoelectric ceramics

Method used

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  • Sodium potassium niobate-sodium bismuth zirconate titanate lead-free piezoelectric ceramic

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Experimental program
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Embodiment 1

[0020] Formula: by general formula (1-x)K 0.5 Na 0.5 NbO 3 -x Bi 0.5 Na0.5 ZrO 3 Lead-free piezoelectric ceramics represented by , where x=0, 0.03, 0.04 or 0.05;

[0021] Preparation process: Analytical pure Na 2 CO 3 , K 2 CO 3 , Nb 2 o 5 , Bi 2 o 3 and ZrO 2 As raw materials, according to the chemical formula of the corresponding formula for batching. Use absolute ethanol as the ball milling medium for the prepared raw materials, dry them with rolling ball mill for 24 h, and then dry them to obtain dry powders. Pre-calcine the obtained dry powders at 850 °C for 6 h to synthesize niobate compounds, and then pre-calcine A good powder is added with a concentration of 8 wt% polyvinyl alcohol aqueous solution to granulate. The consumption of the polyvinyl alcohol aqueous solution is limited to meet the granulation requirements. Pressed under pressure into small discs, and discharged glue. Finally, it was sintered at 1100°C for 3 h, and the sintered ceramic sheet wa...

Embodiment 2

[0026] Formula: by the general formula 0.95K 0.5 Na 0.5 NbO 3 -0.05Bi 0.5 Na 0.5 Zr 1-y Ti y o 3 Lead-free piezoelectric ceramics represented by , where y=0.1, 0.2 or 0.3;

[0027] Preparation process: Analytical pure Na 2 CO 3 , K 2 CO 3 , Nb 2 o 5 , Bi 2 o 3 , TiO 2 and ZrO 2 As raw materials, according to the chemical formula of the corresponding formula for batching. Use absolute ethanol as the ball milling medium for the prepared raw materials, dry them with a rolling ball mill for 24 h, and then dry them to obtain dry powders. Pre-calcine the obtained dry powders at 870 ° C for 5 h to synthesize niobate compounds, and then pre-calcine A good powder is added with a concentration of 8 wt% polyvinyl alcohol aqueous solution to granulate. The consumption of the polyvinyl alcohol aqueous solution is limited to meet the granulation requirements. Pressed under pressure into small discs, and discharged glue. Finally, sinter at 1100°C for 2.5 h. The sintered ce...

Embodiment 3

[0032] Formula: from the general formula 0.95K u Na v NbO 3 -0.05Bi 0.5 Na 0.5 ZrO 3 Lead-free piezoelectric ceramics represented by , where 0.40≤u≤0.55, 0.45≤v≤0.60, and u+v=1.

[0033] Preparation process: Analytical pure Na 2 CO 3 , K 2 CO 3 , Nb 2 o 5 , Bi 2 o 3 and ZrO 2 As raw materials, according to the chemical formula of the corresponding formula for batching. Use absolute ethanol as the ball milling medium for the prepared raw materials, dry them with rolling ball mill for 24 h, and then dry them to obtain dry powders. Pre-calcine the obtained dry powders at 850 °C for 6 h to synthesize niobate compounds, and then pre-calcine A good powder is added with a concentration of 8 wt% polyvinyl alcohol aqueous solution to granulate. The consumption of the polyvinyl alcohol aqueous solution is limited to meet the granulation requirements. Pressed under pressure into small discs, and discharged glue. Finally, it was sintered at 1100°C for 3 h, and the sintere...

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Abstract

The invention belongs to the field of perovskite structure environment-compatible piezoelectric ceramics and particularly relates to a sodium potassium niobate-sodium bismuth zirconate titanate lead-free piezoelectric ceramic. The lead-free piezoelectric ceramic is represented by the general formula (1-x) (KuNav) NbO3-xBi0.5Na0.5Zr1-yTiyO3, wherein x is more than 0 and not more than 0.05, y is not less than 0 and not more than 0.3, u is not less than 0.40 and not more than 0.55, v is not less than 0.45 and not more than 0.60, and u+v=1. The lead-free piezoelectric ceramic provided by the invention has the advantages of higher piezoelectric performance, low price of used raw materials and cost saving, is favorable for promoting the practical process and can be applied to industrial production.

Description

technical field [0001] The invention belongs to the field of piezoelectric ceramics with perovskite structure and environment coordination, and particularly relates to a lead-free piezoelectric ceramic based on sodium potassium niobate-sodium bismuth zirconate titanate. Background technique [0002] Traditional lead zirconate titanate (PZT) based piezoelectric ceramics are widely used in electronic devices such as sensors, transducers and buzzers due to their excellent electrical properties. However, the content of lead oxide (or trilead tetroxide) in its raw materials is as high as more than 60%, which makes this kind of material cause serious harm to human health and the natural environment in the process of preparation, use and disposal. In 2004, Eric Cross, the world's master of ferroelectricity, published a short comment titled "Lead-free at last" in Nature magazine, emphasizing that lead-free piezoelectric ceramics is an inevitable trend. my country is a big country i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495
Inventor 肖定全王卓李方旭吴家刚朱建国余萍
Owner SICHUAN UNIV
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