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 dielectrics, fixed capacitor components, etc., can solve the problem of lack of pressure resistance characteristics, and achieve high pressure resistance strength, good temperature stability, and extremely high temperature stability. The effect of easy chemical process
CN102390997BActive Publication Date: 2014-01-29MORNSUN GUANGZHOU SCI & TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
MORNSUN GUANGZHOU SCI & TECH
Publication Date
2014-01-29

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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.
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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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