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A metastable ion-doped high-voltage lead-free piezoelectric ceramic and its preparation method

An ion-doped, lead-free piezoelectric technology, applied in the field of ceramic materials, can solve the problems of low dielectric constant, high piezoelectric constant, small electric strain S, etc., to increase the strain performance, promote the growth of crystal grains, The effect of improving the inverse piezoelectric coefficient

Active Publication Date: 2021-08-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

KNN-based lead-free piezoelectric materials have the advantages of high Curie temperature, small coercive field, low dielectric constant, and high piezoelectric constant, but there are also some shortcomings, such as alkali metals are easy to volatilize during sintering, and the electric strain S is small. , inverse piezoelectric coefficient d 33 *(=S max / E max ) low disadvantages

Method used

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  • A metastable ion-doped high-voltage lead-free piezoelectric ceramic and its preparation method
  • A metastable ion-doped high-voltage lead-free piezoelectric ceramic and its preparation method
  • A metastable ion-doped high-voltage lead-free piezoelectric ceramic and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) According to K 0.5 Na 0.5 [Nb (1-x) m x ]O 3 The chemical formula of (x=0) is equipped with raw material sodium carbonate, potassium carbonate, niobium pentoxide, metal oxide respectively, and wherein said metal oxide is ferrous oxide or cuprous oxide; Above-mentioned raw material is packed in the ball mill tank, Anhydrous ethanol is used as a ball milling agent, ball milled for 5 hours, and then the slurry is put into an oven and dried under an argon atmosphere;

[0028] (2) pre-synthesize the dried powder obtained in step (1) at 950° C., and keep it warm for 5 hours;

[0029] (3) After sieving the pre-synthesized raw material obtained in step (2), carry out water granulation and molding into green body;

[0030] (4) Sinter the green body formed in step (3) at 1150° C. under an argon atmosphere, and keep it warm for 3 hours to obtain a potassium sodium niobate-based lead-free piezoelectric ceramic material.

Embodiment 2

[0032] Adopt the method in embodiment 1 to prepare, and its difference is that chemical formula K 0.5 Na 0.5 [Nb (1-x) m x ]O 3 (M is FeO, x=0.01); the ball milling time in the step (1) is 5h; the presynthesis temperature in the step (2) is 850°C, and it is kept for 5h; the sintering temperature in the step (3) is 1080°C, and it is kept for 3h; Potassium sodium niobate-based lead-free piezoelectric ceramic material is obtained.

Embodiment 3

[0034] Adopt the method in embodiment 1 to prepare, and its difference is that chemical formula K 0.5 Na 0.5 [Nb (1-x) m x ]O 3 (M is FeO, x=0.01); the ball milling time in the step (1) is 3h; the presynthesis temperature in the step (2) is 900°C, and kept for 6h; the sintering temperature in the step (3) is 1150°C, kept for 2h; Potassium sodium niobate-based lead-free piezoelectric ceramic material is obtained.

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses a lead-free piezoelectric ceramic with metastable ion-doped high-voltage electrical properties and a preparation method thereof. The chemical formula is K 0.5 Na 0.5 [Nb (1‑x) m x ]O 3 , when M is FeO, x=0.01; M is Cu 2 When O, 0.005≤x≤0.01; during preparation, the raw materials sodium carbonate, potassium carbonate, niobium pentoxide, and metal oxides are prepared first, and the raw materials are put into a ball mill jar for ball milling, and then the slurry is put into an oven under an inert atmosphere Drying; the drying powder is precombined at a certain temperature; the pre-synthesized raw materials are granulated and formed into a green body after sieving; the formed green body is sintered and kept warm in an inert atmosphere to obtain potassium sodium niobate Lead-free piezoelectric ceramic material. The invention improves the strain performance of KNN-based piezoelectric ceramics by doping metastable ions, the maximum electric strain S of ceramics is 0.5%, and the inverse piezoelectric coefficient d 33 *Up to 1500pm / V.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a ceramic composition characterized by components and sintering atmosphere. [0002] technical background [0003] Piezoelectric materials are an important class of functional materials that realize the conversion between electrical energy and mechanical energy. Therefore, piezoelectric materials are widely used in many fields such as machinery, electronic communication, and military affairs, and are an extremely important high-tech material. Since lead-based piezoelectric ceramics (PZT) widely used in the market contain a large amount of Pb, which will cause serious harm to humans and the ecological environment during the process of preparation, use, and disposal, research and development of lead-free piezoelectric ceramics with excellent performance, deep meaning. [0004] Among the various lead-free piezoelectric ceramic systems that have been developed,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495
CPCC04B35/495C04B2235/3201C04B2235/3272C04B2235/3281
Inventor 戴叶婧吕玉凯
Owner TIANJIN UNIV