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Niobic acid sodium potassium lithium radical leadless piezo-electric ceramic and preparation method thereof

A technology based on lead-free piezoelectricity and potassium sodium lithium niobate, applied in ceramics, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problem of low piezoelectric constant

Inactive Publication Date: 2007-10-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent is aimed at the piezoelectric constant d of niobate-based lead-free piezoelectric ceramics prepared by the current common sintering method 33 Lower defects, providing a compositional design of sodium potassium lithium niobate-based lead-free piezoelectric ceramics with high piezoelectric constant, which involves the non-stoichiometric range, and its piezoelectric constant d 33 Not less than 150pC / N

Method used

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  • Niobic acid sodium potassium lithium radical leadless piezo-electric ceramic and preparation method thereof

Examples

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example 1

[0016] Example 1: First the raw materials are pressed by the equation (Na 0.569 Kb 0.485 Li 0.40 )(Nb 0.850 Ta 1.5 )O 3 Weighing, the quality of each substance is: 0.7912g sodium carbonate, 0.9255g potassium carbonate, 0.1255g lithium carbonate, 3.5581g niobium pentoxide, 6.5713g tantalum pentoxide. Put the raw materials into a ball mill jar, add 30ml of absolute ethanol as a medium, ball mill at a speed of 160 rpm for 1 hour, transfer the slurry and dry at 80°C for 8 hours. Then the dried powder was calcined at 500° C. for 10 hours. Put the pre-fired powder into a φ20mm mold and press it into shape. Then put the molded powder into a sintering furnace for sintering, and keep it in the atmosphere for 5 hours at 600°C for sintering. Coat the potassium-sodium niobate-based piezoelectric ceramic disk with a baked silver electrode, and polarize it in silicone oil. During the polarization, the temperature is gradually increased from room temperature to 100°C, and then the tim...

example 2

[0017] Example two: first raw material is pressed by equation (Na 0.716 Kb 0.630 Li 0.823 )(Nb 0.220 Ta 0.213 Sb 0.421 )O 3 Weighing, the specific mass of each substance is: 0.2395g sodium carbonate, 0.3722g potassium carbonate, 1.2197g niobium pentoxide, 2.4293g tantalum pentoxide, 0.1520g lithium carbonate, 2.45126 antimony trioxide. Put the raw materials into a ball mill jar, add 30ml of absolute ethanol as a medium, ball mill at a speed of 160 rpm for 1 hour, transfer the slurry and dry at 80°C for 8 hours. Then the dried powder was calcined at 900° C. for 1 hour. Put the pre-fired powder into a φ5mm mold and press it into shape. Then put the formed powder into a sintering furnace for sintering, and keep it in the air for 5 hours at a temperature of 1200°C. Coat the potassium-sodium niobate-based piezoelectric ceramic disc with a baked silver electrode, and polarize it in silicone oil. During the polarization, the temperature is gradually increased from room temper...

example 3

[0018] Example three: first the raw materials are pressed by the equation (Na 0.456 Kb 0.630 Li 0.412 )(Nb 0.360 Ta 0.213 Sb 0.421 )O 3 -0.045-CaO is weighed, and the specific mass of each substance is: 0.4295g sodium carbonate, 0.6522g potassium carbonate, 3.1197g niobium pentoxide, 4.7164g tantalum pentoxide, 0.3521g lithium carbonate, 6.3124 antimony trioxide, 0.1211 g calcium oxide. Put the raw materials into a ball mill jar, add 30ml of absolute ethanol as a medium, ball mill at a speed of 160 rpm for 8 hours, transfer the slurry and dry at 80°C for 8 hours. Then the dried powder was calcined at 700° C. for 3 hours. Put the pre-fired powder into a φ16mm mold and press it into shape. Then put the formed powder into a sintering furnace for sintering, and keep it in the air for 5 hours at a temperature of 1020°C. Coat the potassium-sodium niobate-based piezoelectric ceramic disk with a baked silver electrode, and conduct polarization in silicone oil. During polariza...

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Abstract

The invention discloses a preparing method of niobic acid sodium potassium lithium group leadless piezoelectric ceramic in green energy source material domain, which comprises the following steps: expressing component of niobic acid sodium potassium lithium group as non-stoichiometric ratio general formula (NaaKbLic)(NbxTaySbz)O3 or -nM; expressing a, b, c as A bit element; expressing x, y, z as mole fraction of B bit element; setting the selective rage as (0<=a<=1. 5, 0<=b<=1. 5, 0 C04B 35 / 495 C04B 35 / 64 H01B 3 / 12 H01L 41 / 187 1 6 1 2007 / 5 / 28 101062864 2007 / 10 / 31 100465131 2009 / 3 / 4 2009 / 3 / 4 2009 / 3 / 4 University of Science and Technology Beijing Beijing 100083 Zhang Boping Zhao Pei Li Songjie Ding Xiaonian Zhang Hailong liuru e 11207 The Patent Agency of Beijing University of Science and Technology No.30 Xueyuan Road, Beijing 100083

Description

technical field [0001] The invention belongs to the field of environment-friendly energy materials, and in particular provides a potassium-sodium-lithium niobate-based lead-free piezoelectric ceramic material and a preparation method thereof. Background technique [0002] The widely used piezoelectric ceramic material is Pb(Ti, Zr)O 3 (PZT), PbTiO 3 -PbZrO 3 -ABO 3 (ABO 3 is a composite perovskite ferroelectric) and PbTiO 3 Equal lead-based ceramics, wherein the mass fraction of lead is about 70%. This kind of ceramics will cause serious damage to human beings and the ecological environment in the process of production, use and disposal, so it is imperative to develop lead-free piezoelectric materials. The lead-free piezoelectric ceramics that have been reported so far include tungsten bronze structure ceramic system, potassium niobate-based ceramic system, bismuth layer structure ceramic system and barium titanate ceramic system, among which niobate lead-free piezoele...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/64H01B3/12H01L41/187
Inventor 张波萍赵培李松杰丁小年张海龙
Owner UNIV OF SCI & TECH BEIJING
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