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Method for preparing sodium bismuth titanate piezoelectric ceramic from low-granularity powder

A technology of piezoelectric ceramics and sodium bismuth titanate, which is applied in the field of piezoelectric ceramics preparation, can solve the problems of piezoelectric performance and high-temperature resistivity. There are few studies on the influence of high-temperature resistivity, which cannot meet the actual use requirements and affect high-temperature resistivity. and other problems, to achieve the effect of increasing the remnant polarization strength, improving the polarization effect, and improving the high temperature resistivity

Inactive Publication Date: 2022-01-21
CHINA ELECTRONICS TECH GRP NO 46 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its unique layered structure, the piezoelectric activity is low, and the high-temperature resistivity cannot meet the actual use requirements.
Currently for Na 0.5 Bi 4.5 Ti 4 o 15 The main way to improve the piezoelectric performance of bismuth layered piezoelectric ceramics is ion doping, but with the introduction of doping ions, it will affect its high-temperature resistivity. Therefore, simultaneously improving piezoelectric performance and high-temperature resistivity becomes top priority
For large-scale industrial production, the solid-state reaction method is still the mainstream method. At present, the process adjustment of the solid-state reaction method, especially the ball milling process (powder particle size), affects the piezoelectric performance and high-temperature resistivity of piezoelectric ceramics. There are few studies on the impact

Method used

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  • Method for preparing sodium bismuth titanate piezoelectric ceramic from low-granularity powder
  • Method for preparing sodium bismuth titanate piezoelectric ceramic from low-granularity powder
  • Method for preparing sodium bismuth titanate piezoelectric ceramic from low-granularity powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1), ingredients

[0036] Chemically pure raw material Na with mass purity ≥ 99% 2 CO 3 、 Bi 2 o 3 、TiO 2 、 Ta 2 o 5 、WO 3 and Sm 2 o 3 According to the measurement formula: Na 0.5 Bi 4.5 Ti 3.95 Ta 0.025 W 0.025 o 15.0375 +0.1wt%Sm 2 o 3 The calculated dosage ratio is accurately weighed and mixed. Put the mixed raw materials into a ball mill tank and use a planetary ball mill for ball milling. The grinding balls use agate balls. The agate balls are composed of φ10mm agate balls, φ5mm agate balls and φ3mm agate balls. The weight ratio is 3:4:3. Ethanol is the dispersion medium, the weight ratio of agate balls, raw materials, and absolute ethanol is 5:2:3, the ball milling time is 8 hours, and the frequency of the ball mill is 33.5Hz. Grind in a mortar and pass through a 40-mesh sieve to form a mixed powder.

[0037] (2), synthesis

[0038] Put the mixed powder sieved in step (1) into a crucible, compact it, cover it, seal it, synthesize it in a synt...

Embodiment 2

[0050] (1), ingredients

[0051] Chemically pure raw material Na with mass purity ≥ 99% 2 CO 3 、 Bi 2 o 3 、TiO 2 、 Ta 2 o 5 、WO 3 and Sm 2 o 3 According to the measurement formula: Na 0.5 Bi 4.5 Ti 3.95 Ta 0.025 W 0.025 o 15.0375 +0.1wt%Sm 2 o 3 The calculated dosage ratio is accurately weighed and mixed. Put the mixed raw materials into a ball mill tank and use a planetary ball mill for ball milling. The grinding balls use agate balls. The agate balls are composed of φ10mm agate balls, φ5mm agate balls and φ3mm agate balls. The weight ratio is 3:4:3. Ethanol is the dispersion medium, the weight ratio of agate balls, raw materials, and absolute ethanol is 5:2:3, the ball milling time is 8 hours, and the frequency of the ball mill is 33.5Hz. Grind in a mortar and pass through a 40-mesh sieve to form a mixed powder.

[0052] (2), synthesis

[0053] Put the mixed powder sieved in step (1) into a crucible, compact it, cover it, seal it, synthesize it in a synth...

Embodiment 3

[0065] (1), ingredients

[0066] Chemically pure raw material Na with mass purity ≥ 99% 2 CO 3 、 Bi 2 o 3 、TiO 2 、 Ta 2 o 5 、WO 3 and Sm 2 o 3 According to the measurement formula: Na 0.5 Bi 4.5 Ti 3.95 Ta 0.025 W 0.025 o 15.0375 +0.1wt%Sm 2 o 3 The calculated dosage ratio is accurately weighed and mixed. Put the mixed raw materials into a ball mill tank and use a planetary ball mill for ball milling. The grinding balls use agate balls. The agate balls are composed of φ10mm agate balls, φ5mm agate balls and φ3mm agate balls. The weight ratio is 3:4:3. Ethanol is the dispersion medium, the weight ratio of agate balls, raw materials, and absolute ethanol is 5:2:3, the ball milling time is 8 hours, and the frequency of the ball mill is 33.5Hz. Grind in a mortar and pass through a 40-mesh sieve to form a mixed powder.

[0067] (2), synthesis

[0068] Put the mixed powder sieved in step (1) into a crucible, compact it, cover it, seal it, synthesize it in a synth...

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Abstract

The invention discloses a method for preparing a sodium bismuth titanate piezoelectric ceramic from low-granularity powder. The stoichiometric equation of the sodium bismuth titanate piezoelectric ceramic isNa0.5Bi4.5Ti3.95Ta0.025W0.025O15.0375 + 0.1 wt% Sm2O3 + 0.3 wt% Co2O3. A traditional solid-phase reaction method is adopted, ball milling process parameters and a sintering schedule are adjusted, the piezoelectric ceramic with fine and uniform crystal grains is obtained, the sintering temperature is reduced to 1040 DEG C, the dielectric loss tan delta is reduced to 0.25%, the piezoelectric constant d33 is 33.2 pC / N, the Curie temperature Tc is 674 DEG C, and the high-temperature resistivity rho V at 500 DEG C reaches up to 8.95 * 10<7> omega.cm. The piezoelectric ceramic prepared by the invention is mainly applied to vibration state monitoring of high-temperature objects at 500 DEG C and below. The piezoelectric ceramic prepared by adopting a solid-phase reaction method is simple in process, and the cost can be effectively reduced.

Description

technical field [0001] The invention relates to the preparation of piezoelectric ceramics, in particular to a method for preparing bismuth sodium titanate piezoelectric ceramics by using low particle size powder. Sodium bismuth titanate piezoelectric ceramics are mainly used in vibration state monitoring of high-temperature objects at and below 500°C. Background technique [0002] Piezoelectric ceramics are ceramic materials that convert mechanical energy to electrical energy. They play an important role in the manufacture of electronic components such as sensors, drivers, and ultrasonic transducers, and are widely used in different fields. With the continuous development of science and technology, the performance of piezoelectric ceramics is challenged in some special environments. For example, high-temperature piezoelectric acceleration sensors are required for monitoring the vibration status of aircraft engines, ship gas turbines and other parts. Electroceramics should ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/626C04B35/64C04B41/88
CPCC04B35/475C04B35/622C04B35/6261C04B35/64C04B41/88C04B41/5116C04B2235/3201C04B2235/3224C04B2235/3275C04B2235/3251C04B2235/3258C04B2235/6562C04B2235/6583C04B2235/6567C04B2235/96C04B41/4539C04B41/0072
Inventor 张飞洋闫锋杨声帅张楠赵斌娄岳赵晨
Owner CHINA ELECTRONICS TECH GRP NO 46 RES INST
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