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Lead-free acoustic vibration piezoelectric transduction material and preparation method thereof

A technology of piezoelectric energy conversion and lead-free sound, applied in the field of lead-free piezoelectric ceramics, can solve the problems of wide particle size distribution, large particle size, difficulty in mass production, etc., and achieve light particle agglomeration and excellent stability , the effect of narrow particle size distribution

Inactive Publication Date: 2020-11-13
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the preparation of high-quality nano-micron powders, the solid-phase method is generally rarely used, because the composition of the powder prepared by the solid-phase method has large fluctuations, large particle size, and wide particle size distribution; although, the liquid-phase method High-quality powders with narrow particle size distribution and uniform components can be prepared. However, most liquid-phase methods have disadvantages such as complicated process operations, high equipment costs, and difficulty in mass production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 Preparation of lead-free piezoelectric ceramic material

[0030] Chemical formula is

[0031] 0.965 (K 0.5 Na 0.5 )(Nb0.95 Sb 0.05 )O 3 -0.035Bi 0.5 (Na 0.82 K 0.18 ) 0.5 HfO 3 Preparation of lead-free piezoelectric ceramic materials:

[0032] Using analytically pure Na 2 CO 3 (99.8%), K 2 CO 3 (99%), Nb 2 o 5 (99.5%), Sb 2 o 3 (99.99%), Bi 2 o 3 (99.999%), HfO 2 (99%) is a raw material, weighed according to the molar ratio of metal atoms in the chemical formula, and takes ethanol as a medium ball mill for 24h, and then dries;

[0033] The dried nano-powder was calcined at 850°C for 6 hours; the calcined powder was mixed with an 8% PVA aqueous solution for granulation, and then pressed under a pressure of 10Mpa to form a diameter of 10mm, samples with a thickness of 1mm;

[0034] Raise the sample from room temperature to 150°C at a speed of 10°C / min, keep it warm for 40 minutes, remove the moisture adsorbed on the surface and inside an...

Embodiment 2

[0036] Embodiment 2 Piezoelectric performance test

[0037] The polarized lead-free piezoelectric ceramic sample prepared in Example 1 was placed naturally for 24 hours, and its performance was tested. Its density is 98.5% of the theoretical density; piezoelectric coefficient d 33 is 580pC / N, its reverse piezoelectric coefficient d 33 ﹡The fluctuation within the temperature range of 20~100℃ is not more than 10%. The Curie temperature Tc is 320°C, at 10 6 It still works after a cycle.

Embodiment 3

[0038] Embodiment 3 Preparation of lead-free piezoelectric ceramic material

[0039] The chemical formula is 0.97(K 0.5 Na 0.5 )(Nb 0.95 Sb 0.05 )O 3 -0.03Bi 0.5 (Na 0.82 K 0.18 ) 0.5 HfO 3 Preparation of lead-free piezoelectric ceramic materials:

[0040] Using analytically pure Na 2 CO 3 (99.8%), K 2 CO 3 (99%), Nb 2 o 5 (99.5%), Sb 2 o 3 (99.99%), Bi 2 o 3 (99.999%), HfO 2 (99%) is raw material, weighs according to the molar ratio of metal atoms in the chemical formula, takes ethanol as medium ball milling 20h, then dries;

[0041] The dried nano-powder was calcined at 900°C for 5 hours; the calcined powder was mixed with a PVA aqueous solution with a mass concentration of 6% for granulation, and then pressed under a pressure of 10Mpa to form a diameter of 10mm, samples with a thickness of 1mm;

[0042] Raise the sample from room temperature to 150°C at a speed of 10°C / min, keep it warm for 40 minutes, remove the moisture adsorbed on the surface and in...

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Abstract

The invention provides a lead-free acoustic vibration piezoelectric transduction material and a preparation method thereof. The chemical composition of the lead-free acoustic vibration piezoelectric transduction material is (1-x) (K0. 5Na0. 5) (Nb0. 95Sb0. 05) O3-xBi0.5 (Na0.82K0.18)0.5HfO3, wherein x ranges from 0.03 to 0.05. The preparation process provided by the invention is simple, green andenvironment-friendly, and the prepared lead-free acoustic vibration piezoelectric transduction material has a good temperature stability characteristic within a certain temperature range while ensuring a high piezoelectric constant, and has a wide application value.

Description

technical field [0001] The application belongs to the technical field of lead-free piezoelectric ceramics, and in particular relates to a preparation method of a lead-free acoustic vibration piezoelectric transducer material. Background technique [0002] Piezoelectric ceramics have been widely used in many electronic devices, such as sensors and drivers. Although traditional lead-based ceramics have excellent performance, they are harmful to the environment and human health. Therefore, it is urgent to develop high-performance lead-free materials. In recent years, there have been countless studies on lead-free piezoelectric ceramics. At present, the research on lead-free piezoelectric materials mainly focuses on bismuth sodium titanate (BNT), potassium sodium niobate (KNN), barium calcium zirconate titanate (BCZT) and other systems. After a long period of research, these lead-free piezoelectric ceramic materials have made some progress in preparation and performance, but g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64C04B41/88
CPCC04B35/495C04B35/622C04B35/64C04B41/88C04B41/5116C04B41/009C04B2235/3201C04B2235/3294C04B2235/3298C04B2235/3244C04B2235/6562C04B2235/661
Inventor 张嵩阳聂京凯崔建业姚德贵田一秘立鹏王磊磊王广周汲胜昌祝令瑜肖伟民
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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