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Potassium-sodium niobate-based leadless piezoelectric ceramic and two-step sintering preparation method thereof

A potassium-sodium niobate-based, lead-free piezoelectric technology, which is applied in the field of ceramic compositions, can solve the problems of alkali metal loss and achieve the effect of shortening the time and making up for the loss

Inactive Publication Date: 2013-02-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of alkali metal loss in the preparation process of potassium sodium niobate-based lead-free piezoelectric ceramic materials, and provide a potassium niobate that is modified by adding potassium niobate and two-step sintering to prepare lithium tantalum antimony modified potassium sodium niobate Lead-free piezoelectric ceramic material and preparation method thereof

Method used

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  • Potassium-sodium niobate-based leadless piezoelectric ceramic and two-step sintering preparation method thereof
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  • Potassium-sodium niobate-based leadless piezoelectric ceramic and two-step sintering preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Ingredients synthesis

[0025] Press (Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 Sb 0.08 Ta 0.04 )O 3 Weigh the raw materials sodium carbonate, potassium carbonate, lithium carbonate, niobium pentoxide, tantalum pentoxide and antimony trioxide, mix them, put them into a ball mill jar, and the ball mill medium is absolute ethanol and zirconia balls , ball milled for 6 hours, and the ball milling speed was 800 rpm; the slurry was dried in an oven at 80°C to obtain the original ingredients of A; the same conditions were obtained by KNbO 3 The stoichiometric ratio of raw materials is weighed, mixed, ball milled and dried to obtain the raw ingredients of B;

[0026] (2) pre-burning

[0027] Put the raw ingredients of A and B obtained in step (1) into the crucible respectively, cover and seal, keep warm in a muffle furnace at 800°C for 3 hours, cool naturally to room temperature, and take out the furnace to obtain A and B powders;

[0028] (3) Secondary ball milling

[00...

Embodiment 2

[0039] Using the same method as in Example 1, the sintering temperature in the first step is 1130° C., and the sintering temperature in the second step is 1020° C. to prepare potassium sodium niobate-based piezoelectric ceramics.

Embodiment 3

[0041] Using the same method as in Example 1, the sintering temperature in the first step is 1130° C., and the sintering temperature in the second step is 1000° C. to prepare potassium sodium niobate-based piezoelectric ceramics.

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Abstract

The invention discloses a potassium-sodium niobate-based leadless piezoelectric ceramic and a two-step sintering preparation method thereof. The potassium-sodium niobate-based leadless piezoelectric ceramic comprises the following raw material components by mole percent: aKNbO3-(1-a)(Na0.52K0.44Li0.04)(Nb0.88Sb0.08Ta0.04)O3, wherein in the formula, a is 0.04-0.06. By adopting the two-step sintering solid phase synthesis preparation method, the first sintering temperature is controlled to be 1130-1150 DEG C, the insulation time is controlled to be 1min, the second sintering temperature is controlled to be 900-1040 DEG C, and the insulation time is controlled to be 7h, so that a novel piezoelectric ceramic material is obtained; the piezoelectric coefficient d33 is maximally 328pC / N, the ferroelectric properties are good, and the remanent polarization intensity Pr and the coercive field Ec are respectively 17-23 mu C / cm<2> and 0.5-0.7 kV / mm. The leadless piezoelectric ceramic material can be applied to the fields of sound converters, piezoelectric lighters, drivers, resonators and the like.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a potassium sodium niobate-based lead-free piezoelectric ceramic and a two-step sintering preparation method thereof. Background technique [0002] Piezoelectric ceramic materials are used in all fields of society and all aspects of people's lives. At present, the most widely used lead-based piezoelectric ceramics (PZT) cause serious harm to humans and the ecological environment due to the existence of lead in the process of preparation, use, and disposal. Therefore, research and development of lead-free piezoelectric ceramics with excellent performance, Profound and urgent. [0003] At present, people have developed a variety of lead-free piezoelectric ceramics, BaTiO 3 It is the first typical lead-free piezoelectric material discovered, but its application is limited due to its low Curie point and high sintering temperature. Potassium sodium niobate-based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 戴叶婧李洋
Owner TIANJIN UNIV
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