High-dielectric-strength potassium sodium niobate based lead-free piezoelectric ceramic as well as preparation method and application thereof

A potassium-sodium niobate-based, lead-free piezoelectric technology, applied in the direction of fixed capacitor dielectric, fixed capacitor parts, etc., can solve the problem of no withstand voltage characteristics, achieve high withstand voltage strength, good temperature stability, extremely The effect of easy chemical process

Active Publication Date: 2012-03-28
MORNSUN GUANGZHOU SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on the niobate system is mostly limited to using it as a piezoelectric ferroelectric material and aiming at continuously improving its piezoelectric ferroelectric performance, but there is no report on its withstand voltage characteristics

Method used

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  • High-dielectric-strength potassium sodium niobate based lead-free piezoelectric ceramic as well as preparation method and application thereof
  • High-dielectric-strength potassium sodium niobate based lead-free piezoelectric ceramic as well as preparation method and application thereof
  • High-dielectric-strength potassium sodium niobate based lead-free piezoelectric ceramic as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The high withstand voltage potassium sodium niobate-based lead-free piezoelectric ceramic material provided in this example is prepared according to the following method:

[0044] (1), purchase chemically pure Na from the market 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Ta 2 o 5 , MnO 2 As raw material, according to the chemical formula [(Na 0.5+x K 0.5-x ) 0.94 Li 0.06 ][(Nb 0.94 Sb 0.06 ) 0.95 Ta 0.05 ]O 3 +ymol%MnO 2 , where x=0, y=0.12 Weigh the raw materials; put the weighed raw materials into the ball mill jar, add the dehydrated alcohol accounting for 80% of the total weight of the above raw materials, and mix them at a speed of 140r / min on the planetary ball mill And grind for 2h;

[0045] (2), put the mixed material after ball milling in the crucible after drying at 60°C, pre-burn at 890°C, and keep it for 3.5h; After water ethanol, grind at a speed of 140r / min for 4h;

[0046] (3), dry the finely ground pre-fired synthetic po...

Embodiment 2

[0051] The high withstand voltage potassium sodium niobate-based lead-free piezoelectric ceramic material provided in this example is prepared according to the following method:

[0052] (1), purchase chemically pure Na from the market 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Ta 2 o 5 , MnO 2 As raw material, according to the chemical formula [(Na 0.5+x K 0.5-x ) 0.94 Li 0.06 ][(Nb 0.94 Sb 0.06 ) 0.95 Ta 0.05 ]O 3 +ymol%MnO 2 , wherein x=0.01, y=0.08 take the raw material; put the weighed raw material in the ball mill jar, add the dehydrated alcohol accounting for 90% of the total weight of the above raw material, and mix it on the planetary ball mill at a speed of 120r / min And grind for 3h;

[0053] (2), put the ball-milled mixture in a crucible after drying at 90°C, pre-fire at 920°C, and hold for 4 hours; the pre-fired synthetic powder is added with anhydrous powder accounting for 85% of the total weight of the powder After ethanol, grind ...

Embodiment 3

[0059] The high withstand voltage potassium sodium niobate-based lead-free piezoelectric ceramic material provided in this example is prepared according to the following method:

[0060] (1), purchase chemically pure Na from the market 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Ta 2 o 5 , MnO 2 As raw material, according to the chemical formula [(Na 0.5+x K 0.5-x ) 0.94 Li 0.06 ][(Nb 0.94 Sb 0.06 ) 0.95 Ta 0.05 ]O 3 +ymol%MnO 2, wherein x=0.03, y=0.02 take the raw material; put the weighed raw material in the ball mill jar, add the dehydrated alcohol accounting for 100% of the total weight of the above raw material, and mix it on the planetary ball mill at a speed of 160r / min And grind for 1.5h;

[0061] (2), put the mixed material after ball milling in the crucible after drying at 65°C, pre-fire at 905°C, and keep it for 2.5h; After water ethanol, grind at a speed of 200r / min for 3h;

[0062] (3) Dry the finely ground pre-fired synthetic powd...

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Abstract

The invention discloses potassium sodium niobate based lead-free piezoelectric ceramic, which is characterized by having a chemical formula of [(Na0.5+xK0.5-x)0.94Li0.06][(Nb0.94Sb0.06)0.95Ta0.05]O3+ymol%TM+zmol%RE, wherein TM is MnO2, Fe2O3 or Ni2O3, RE is CeO2 or Nd2O3, the value of x is 0 or 0.01-0.11, the value of y is 0.02-0.12, and the value of z is 0-0.05. The invention further discloses a preparation method application of the ceramic. The ceramic disclosed by the invention maintains an excellent piezoelectric ferroelectric property, simultaneously has a high withstand voltage performance, has very good withstand voltage performance and temperature stability, and still maintains very high withstand voltage strength at the high temperature of 140 DEG C. The voltage withstand performance of the material is obviously superior to that of the commonly used barium strontium titanate (BST) based high-voltage ceramic capacitor material, and the withstand voltage value of the material at normal temperature is 1.7 times more than that of a BST material.

Description

technical field [0001] The invention relates to the technical field of lead-free piezoelectric ceramic materials, in particular to a high-voltage-resistant sodium potassium niobate-based lead-free piezoelectric ceramic, its preparation method and application. Background technique [0002] Piezoelectric ceramics is a functional material with a wide range of uses. It is widely used in the production of ultrasonic transducers, piezoelectric transformers, filters, piezoelectric buzzers and other devices. It plays an important role in national economy, modern science and technology, and modern national defense. Traditional ferroelectric piezoelectric ceramic materials are mainly based on Pb(Zr,Ti)O 3 (referred to as PZT)-based binary and ternary ceramics have a series of excellent properties, but PZT-based materials contain a large amount of lead, of which PbO (or Pb 3 o 4 ) content accounts for about 70% of the total mass of raw materials. This type of material will spread tox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622H01G4/12
CPCY02E60/13
Inventor 何云斌郭金明尚勋忠周桃生柴荔英尹向阳胡健仁
Owner MORNSUN GUANGZHOU SCI & TECH
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