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Piezoelectric ceramic material and preparation method thereof

A technology of piezoelectric ceramics and powder materials, which is applied in the field of preparation of piezoelectric ceramic materials, can solve the problem that the piezoelectric performance and dielectric performance are not weak, the piezoelectric performance and dielectric performance are poor, and the piezoelectric ceramic buzzer cannot be satisfied. and other problems, to achieve the effect of superior piezoelectric performance and dielectric performance, less decrease in piezoelectric performance and dielectric performance, and increased Curie point

Active Publication Date: 2010-07-07
NINGBO KEPO ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the literature in this area is relatively rich, few piezoelectric ceramic buzzers can pass 270°C reflow soldering. The key is that the performance of piezoelectric ceramic materials cannot meet the requirements.
Lead niobate, lithium niobate, and lead titanate piezoelectric ceramic materials have relatively high Curie points, but their piezoelectric and dielectric properties are relatively poor, which cannot meet the requirements of piezoelectric ceramic buzzers. For materials with good electrical ceramic properties, the Curie point will not exceed 330°C, but the Curie point of binary PZT piezoelectric ceramics is high, and the piezoelectric and dielectric properties are not weak. , the choice of titanium ratio, and it is modified by doping with niobium pentoxide, antimony trioxide, lanthanum trioxide, silicon dioxide, and strontium carbonate and magnesium carbonate, so that piezoelectric ceramics can reach The best piezoelectric and dielectric properties, while the Curie point exceeds 355°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, by chemical formula composition

[0029] Pb 1.038 Sr 0.012 Zr 0.5285 Ti 0.4715 o 3 +0.4mol% La 2 o 3 +0.8mol%Nb 2 o 5 +0.1mol% SiO 2 ,

[0030] Calculation of Pb in various raw materials 3 o 4 , ZrO 2 、TiO 2 , SrCO 3 , Nb 2 o 5 , La 2 o 3 , SiO 2 Proportioning, weighing with an electro-optic analytical balance, vibrating and grinding in a high-efficiency vibrating mill for 4 hours, putting the mixture into an alumina crucible, and then entering a tunnel kiln for pre-burning, the maximum temperature is 1020°C, and the entry and exit time is 36 hours , the time in the high temperature zone is 4.5 hours. After the pre-burned material is crushed, it is first vibrated and ground in a high-efficiency vibrating mill for 6 hours, then the powder is taken out, put into a ball mill for water milling for 24 hours, taken out and dried, and weighed. Ceramic powder, adhesive, defoamer, and plasticizer were ball-milled in a ball mill for 10 hours to p...

Embodiment 2

[0033] Embodiment 2: Composition by chemical formula

[0034] Pb 1.038 Sr 0.012 Zr 0.5285 Ti 0.4715 o 3+0.5mol%La 2 o 3 +0.5mol% LiNbO 3 +0.1mol% SiO 2 ,

[0035] Calculation of Pb in various raw materials 3 o 4 , ZrO 2 、TiO 2 , SrCO 3 , Nb 2 o 5 , Li 2 CO 3 , La 2 o 3 , SiO 2 Proportioning, weighing with an electro-optic analytical balance, vibrating and grinding in a high-efficiency vibrating mill for 4 hours, putting the mixture into an alumina crucible, and then entering a tunnel kiln for pre-burning, the maximum temperature is 1030°C, and the in and out time is 36 hours , the time in the high temperature zone is 4.5 hours. After the pre-burned material is crushed, it is first vibrated and ground in a high-efficiency vibrating mill for 6 hours, then the powder is taken out, put into a ball mill for water milling for 24 hours, taken out and dried, and weighed. The ceramic powder, binder, defoamer, and plasticizer were milled in a ball mill for 10 hours ...

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Abstract

The invention discloses a piezoelectric ceramic material, the chemical formula of the material is as follows: Pb1.05-dSrdZrxTiyO3 + amol% La2O3 + bmol% M + cmol% SiO2, wherein, d is more than or equal to 0 and less than or equal to 0.03, x + y = 1, a is more than or equal to 0 and less than or equal to 5, b is more than or equal to 0 and less than or equal to 5, c is more than or equal to 0 and less than or equal to 1, M presents LiNbO3 or Nb2O5. The invention also discloses the preparation method of the piezoelectric ceramic material. Compared with the prior art, the advantages of the invention are as follows: replacement of doping in the PZT piezoelectric ceramic is conducted, and the preparation process which is suitable for the piezoelectric ceramic material is selected creatively, which leads the Curie point of the piezoelectric ceramic material to be greatly increased, the piezoelectric property and the dielectric property are excellent, under high temperature of 270 degrees C., the piezoelectric property and the dielectric property of the piezoelectric ceramic material is decreased very little, and the invention can be used for SMD piezoelectric ceramic buzzer.

Description

technical field [0001] The invention relates to a piezoelectric ceramic material, and also relates to a preparation method of the piezoelectric ceramic material. Background technique [0002] Piezoelectric ceramics is a functional ceramic material that can convert mechanical energy and electrical energy into each other. It is widely used in many fields closely related to people's lives to achieve energy conversion, sensor drive, frequency control, etc. Features. In terms of energy conversion, piezoelectric igniters, mobile X-ray machine power supplies, shell detonators, piezoelectric transformers, piezoelectric pickups, piezoelectric buzzers, piezoelectric horns, metal flaw detectors, ultrasonic cleaning, Ultrasound medical, ultrasonic cutter. In terms of sensing, it can be used in sonar systems, car reversing sensors, weather detection, telemetry environmental protection, and household appliances. In terms of drive, it can be used for precise control mechanisms - control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/491C04B35/622
Inventor 徐锦生
Owner NINGBO KEPO ELECTRONICS
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