Barium hafnium titanate leadless piezoelectric ceramic with high piezoelectric coefficient and preparation method of leadless piezoelectric ceramic

A barium titanium hafnium oxide and lead-free piezoelectric technology, applied in the field of piezoelectric ceramics, can solve the problems of difficult industrialized production, serious environmental pollution, and performance that has not been reported in literature, and achieves the effects of saving production costs and a simple preparation process.

Inactive Publication Date: 2013-12-25
YILI NORMAL UNIV
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  • Application Information

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Problems solved by technology

Pure BaTiO 3 The electromechanical coupling system can reach 0.36, the mechanical quality factor can reach 360, and the piezoelectric performance is only at a medium level. The piezoelectric coefficient d 33 is about 190×10 -12 C / N, the preparation is relatively simple, and the shape and polarization direction can be selected arbitrarily, but due to its low Curie temperature (Tc = 120℃ ), narrow working temperature range, and near room temperature In the working temperature range), there are orthorhombic and tetragonal phase transitions, and the time and temperature stability of performance parameters are not good. At present, BT-based ceramics are mainly used as dielectric materials (such as multilayer ceramic capacitors), as voltage Electrical applications are rare
The improvement of BT performance is mainly concentrated in two aspects. One is to modify the barium titanate by changing the process (two-step sintering method), but the preparation process requires high technology, serious environmental pollution, and it is difficult to realize industrial production; the other One is to improve the performance of BT materials by doping the A-site and B-site elements in BT. The outstanding work is that Zhi Yu, Chen Ang, Ruyan Guo, and A. S. Bhalla used the solid-state reaction method to Ba (Ti 1-x Zr x ) O 3 (x=0 to 0.3) ferroelectric ceramics, found that at x=0.05, the electromechanical coupling coefficient of the material K 33 =56.5%, piezoelectric coefficient d 33 =236pC / N (JOURNAL OF APPLIED PHYSICS, 92(3), 2002), Wei Li, Zhijun Xu, Ruiqing Chu, Peng Fu and Guozhong Zang prepared Ba(Ti 1-x Zr x )O 3 (x=0.02 to 0.2) Ferroelectric ceramics, found that the dielectric constant can reach 15900 at x = 0.15, and the piezoelectric coefficient of ceramics at x = 0.05 d 33 =208pC / N, Kp=31.5%, Qm=500 (Brazilian Journal of Physics, vol. 40, no. 3, September, 2010), but Ba(Ti 1-x Zr x ) O 3 sub> The sintering temperature is above 1500℃
At present, there is no literature report on the performance of piezoelectric ceramics with high piezoelectric coefficient of barium titanium hafnate

Method used

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  • Barium hafnium titanate leadless piezoelectric ceramic with high piezoelectric coefficient and preparation method of leadless piezoelectric ceramic
  • Barium hafnium titanate leadless piezoelectric ceramic with high piezoelectric coefficient and preparation method of leadless piezoelectric ceramic
  • Barium hafnium titanate leadless piezoelectric ceramic with high piezoelectric coefficient and preparation method of leadless piezoelectric ceramic

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Embodiment 1

[0023] Example 1, the high piezoelectric coefficient barium hafnate titanium lead-free piezoelectric ceramics are obtained according to the following preparation method: the first step, the BaCO 3、 TiO 2 and HfO 2 According to the ratio of the amount of substance 1: (1-x): x mixed into the mixed material, where x=0.005 or x=0.02 or x=0.05 or x=0.07 or x=0.1 or x=0.2; the second step, Put the mixed material and deionized water into the ball mill and mill for 15 h to 18 h to obtain a slurry. The amount of deionized water added is 1 to 1.5 times the volume of the mixed material, and then the slurry is placed at a temperature of 80 ° C to After drying at 100°C for 3 hours to 5 hours, keep the temperature in a high-temperature resistance furnace at 1100°C for 2 hours to 4 hours to obtain powder; the third step is to mix polyvinyl alcohol with a mass percentage concentration of 2.5% per 4 grams of powder The solution is 0.3ml to 0.4ml, and polyvinyl alcohol solution ...

Embodiment 2

[0024] Example 2, the high piezoelectric coefficient barium hafnate titanium lead-free piezoelectric ceramics are obtained according to the following preparation method: in the first step, BaCO 3、 TiO 2 and HfO 2 According to the ratio of the amount of substance 1: (1-x): x mixed into the mixed material, where x=0.005 or x=0.02 or x=0.05 or x=0.07 or x=0.1 or x=0.2; the second step, Add the mixed material and deionized water into the ball mill and mill for 15 h or 18 h to obtain a slurry. The amount of deionized water added is 1 or 1.5 times the volume of the mixed material, and then the slurry is placed at a temperature of 80 ° C or After drying at 100°C for 3 hours or 5 hours, keep the temperature in a high-temperature resistance furnace at 1100°C for 2 hours or 4 hours to obtain powder; in the third step, mix polyvinyl alcohol with a mass percentage concentration of 2.5% per 4 grams of powder The solution is 0.3 ml or 0.4 ml, and polyvinyl alcohol solution i...

Embodiment 3

[0025] Example 3, as an optimization of the above example, in the second step of Example 3, the temperature rise rate of the high temperature resistance furnace is 2°C / min to 4°C / min.

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Abstract

The invention relates to the technical field of piezoelectric ceramics, in particular to barium hafnium titanate leadless piezoelectric ceramic with a high piezoelectric coefficient and a preparation method of the leadless piezoelectric ceramic. The preparation method of the barium hafnium titanate leadless piezoelectric ceramic with the high piezoelectric coefficient comprises the steps of uniformly mixing BaCO3, TiO2 and HfO2 at a ratio of 1:(1-x):x into a mixed material. Compared with barium titanate ceramic, under the condition that the sintering temperature of the barium hafnium titanate leadless piezoelectric ceramic is slightly lower than that of the barium titanate ceramic, the piezoelectric coefficient of the barium hafnium titanate leadless piezoelectric ceramic is 2-3 times that of the barium titanate ceramic; compared with zircon barium titanate ceramic, under the condition that the sintering temperature of the barium hafnium titanate leadless piezoelectric ceramic is much lower than that of the zircon barium titanate ceramic, the piezoelectric coefficient of the barium hafnium titanate leadless piezoelectric ceramic is much higher than that of the zircon barium titanate ceramic; the sintering temperature of a material is reduced on the basis of increasing the piezoelectric coefficient of the material; the production cost is saved; and in addition, the preparation technology is simple and is applicable to industrial production and popularization.

Description

technical field [0001] The invention relates to the technical field of piezoelectric ceramics, and relates to a lead-free piezoelectric ceramic of barium hafnate titanate with high piezoelectric coefficient and a preparation method thereof. Background technique [0002] Barium titanate (BaTiO 3 , bt) for a typical ABO 3 Perovskite-type ferroelectrics are the earliest lead-free piezoelectric materials discovered. The corresponding BT-based piezoelectric materials have been studied for a long time. They are quite mature lead-free piezoelectric ceramics. They were originally used for piezoelectric vibrator materials. It is currently one of the important materials for making capacitors. Pure BaTiO 3 The electromechanical coupling system can reach 0.36, the mechanical quality factor can reach 360, and the piezoelectric performance only belongs to the middle level piezoelectric coefficient d 33 About 190×10 -12 C / N, the preparation is relatively simple, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 尹红梅马晓娇丁捷杜卫平黄以能
Owner YILI NORMAL UNIV
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