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Potassium-sodium niobate-based leadless piezoelectric ceramic with high piezoelectric constant and preparation method of potassium-sodium niobate-based leadless piezoelectric ceramic

A potassium-sodium niobate-based, lead-free piezoelectric technology, applied in the field of lead-free piezoelectric ceramics, can solve problems such as human health and ecological environment damage, and achieve the effect of broadening application scenarios, improving piezoelectric constant, and good electrical performance

Active Publication Date: 2021-01-12
YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead zirconate titanate (PZT)-based piezoelectric materials are commonly used at present. In PZT piezoelectric materials, lead (Pb) elements account for about 70% of the total weight of the material. will cause serious damage to human health and the ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A potassium sodium niobate-based lead-free piezoelectric ceramic with a high piezoelectric constant, the chemical composition of the potassium sodium niobate-based lead-free piezoelectric ceramic with a high piezoelectric constant is: (1-x)(K 0.5 Na 0.5 )Nb 1-y Sb y o 3 +xCuZr 0.5 Ti 0.5 o 3 , wherein, x, y are mole percentages, 0≤x≤0.4, 0.01≤y≤0.2.

[0027] Preferably, the preparation method of the potassium sodium niobate-based lead-free piezoelectric ceramic with high piezoelectric constant comprises the following steps:

[0028] 1) Pretreatment of raw materials: Put potassium carbonate, sodium carbonate, niobium pentoxide, antimony trioxide, copper oxide, zirconium dioxide and titanium dioxide into a petri dish, place in an oven, and keep warm at 120-150°C for 3- 6h;

[0029] 2) Weighing and mixing: according to the chemical composition of potassium sodium niobate-based lead-free piezoelectric ceramics of the high piezoelectric constant, weigh the raw materi...

Embodiment 2

[0038] A potassium sodium niobate-based lead-free piezoelectric ceramic with a high piezoelectric constant, comprising the chemical composition of the following atomic percentages, 95% (K 0.5 Na 0.5 )Nb 0.9 Sb 0.1 o 3 and 5% CuZr 0.5 Ti 0.5 o 3 , the preparation method comprises the following steps:

[0039]1) Pretreatment of raw materials: put potassium carbonate, sodium carbonate, niobium pentoxide, antimony trioxide, copper oxide, zirconium dioxide and titanium dioxide into a petri dish, place in an oven, and keep warm at 120°C for 5 hours;

[0040] 2) Weighing and mixing: Weigh the pretreated raw materials according to the chemical composition ratio, disperse them in absolute ethanol, put them into a ball mill for wet grinding, the speed of the ball mill is 500rpm, and the wet grinding time is 36h. Take it out and put it in an oven for drying, grind it with an agate mortar, pass through an 80-mesh sieve, and make a dry powder;

[0041] 3) Pre-calcination: put the p...

Embodiment 3

[0046] A potassium sodium niobate-based lead-free piezoelectric ceramic with a high piezoelectric constant, comprising the chemical composition of the following atomic percentages, 90% (K 0.5 Na 0.5 )Nb 0.92 Sb 0.08 o 3 and 10% CuZr 0.5 Ti 0.5 o 3 , the preparation method comprises the following steps:

[0047] 1) Pretreatment of raw materials: put potassium carbonate, sodium carbonate, niobium pentoxide, antimony trioxide, copper oxide, zirconium dioxide and titanium dioxide into a petri dish, place in an oven, and keep warm at 130°C for 4 hours;

[0048] 2) Weighing and mixing: Weigh the pretreated raw materials according to the chemical composition ratio, disperse them in absolute ethanol, put them into a ball mill for wet milling, the speed of the ball mill is 400rpm, and the wet milling time is 48h. Take it out and put it in an oven for drying, grind it with an agate mortar, pass through an 80-mesh sieve, and make a dry powder;

[0049] 3) Pre-calcination: put the...

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Abstract

The invention discloses potassium-sodium niobate-based leadless piezoelectric ceramic with a high piezoelectric constant. The chemical composition of the potassium-sodium niobate-based leadless piezoelectric ceramic with the high piezoelectric constant is (1-x)(K<0.5>Na<0.5>)Nb<1-y>Sb<y>O<3>+xCuZr<0.5>Ti<0.5>O<3>, x and y are mole percentages, 0<=x<=0.4, and 0.01<=y<=0.2. According to the potassium-sodium niobate-based leadless piezoelectric ceramic with the high piezoelectric constant and the preparation method thereof, doping modification is carried out by adopting copper, antimony, zirconium and titanium elements, so that charge and vacancy compensation is realized, the piezoelectric constant is improved, and the piezoelectric sensitivity of the leadless piezoelectric ceramic is improved. The potassium-sodium niobate-based leadless piezoelectric ceramic adopted by the invention has a high piezoelectric constant, the application scene of the leadless piezoelectric ceramic is greatlybroadened, and meanwhile, the leadless piezoelectric ceramic is green and environment-friendly, so that the damage to human health and the environment can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of lead-free piezoelectric ceramics, in particular to potassium sodium niobate-based lead-free piezoelectric ceramics with a high piezoelectric constant and a preparation method thereof. Background technique [0002] Piezoelectric materials can realize mutual conversion between mechanical energy and electrical energy, and have a wide range of applications in technical fields such as information, electronics, precision instruments, and ultrasonic testing. Lead zirconate titanate (PZT)-based piezoelectric materials are commonly used at present. In PZT piezoelectric materials, lead (Pb) elements account for about 70% of the total weight of the material. It will cause serious damage to human health and ecological environment. Potassium sodium niobate-based lead-free piezoelectric ceramics have strong piezoelectric properties. Through the improvement of the formulation system and preparation method, there is roo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64
CPCC04B35/495C04B35/622C04B35/64C04B2235/3201C04B2235/3294C04B2235/3281C04B2235/3232C04B2235/3244C04B2235/3255
Inventor 龚文吴超峰俞胜平高洪伟
Owner YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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