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A kind of bismuth niobate calcium-based piezoelectric ceramic and its preparation method and application

A technology of calcium bismuth niobate and piezoelectric ceramics, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc. The improvement of electrical properties, resistivity and temperature stability is limited, and it is difficult to meet the problems of high temperature detection sensitivity of piezoelectric vibration sensors, so as to achieve the effect of improving remanent polarization.

Active Publication Date: 2022-03-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Through the perovskite-like layer (CaNb 2 o 7 ) 2- The chemical modification and doping of CBN piezoelectric ceramics has a limited effect on improving the ferroelectric properties, piezoelectric properties, resistivity and temperature stability, and it is difficult to meet the needs of piezoelectric vibration sensors with high temperature resistance and high detection sensitivity.

Method used

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  • A kind of bismuth niobate calcium-based piezoelectric ceramic and its preparation method and application
  • A kind of bismuth niobate calcium-based piezoelectric ceramic and its preparation method and application
  • A kind of bismuth niobate calcium-based piezoelectric ceramic and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0047] Reference sample CaBi 2 Nb 2 o 9 (CBN) preparation:

[0048] In parts by weight, successively weigh 12.084 parts of CaCO 3 , 55.981 Bi 2 o 3 , 31.935 parts of Nb 2 o 5 Pour it into a ball mill jar, add zirconia balls with a diameter of 2 mm twice the mass of the powder, and then add 2 times the volume of absolute ethanol; put the above ball mill jar into a planetary ball mill, set the speed at 240 r / min , ball milled for 12 h; the above ball-milled slurry was kept in a drying oven at 50°C for 4 h, dried and ground into powder, passed through a 100-mesh sieve, and pressed into a block with a mold with an inner diameter of 20 mm at 10 MPa; the above block The body was put into a crucible with a lid, and pre-fired at 850°C for 4 hours; the above-mentioned pre-fired powder block was ground with a mortar, and poured into a ball mill jar, and the ball milling parameters were the same ball milling; after ball milling, dried The powder is passed through a 100-mesh siev...

reference example 2

[0050] Ca 0.8 (Na 0.5 Bi 0.5 ) 0.2 Bi 2 Nb 2 o 9 (x=0) Preparation of piezoelectric ceramics: the raw material of the piezoelectric ceramics is 9.570 parts of CaCO in parts by weight 3 , 0.631 parts of Na 2 CO 3 , 58.187 Bi 2 o 3 and 31.612 parts of Nb 2 o 5 , the sintering temperature was 1110° C., and the other steps and conditions were the same as those in Reference Example 1.

Embodiment 1

[0052] Ca 0.8 (Na 0.5 La 0.1 Bi 0.4 ) 0.2 Bi 2 Nb 2 o 9 (x=0.1) Preparation of piezoelectric ceramics: the raw material of the piezoelectric ceramics is CaCO 3 、Na 2 CO 3 , La 2 o 3 、 Bi 2 o 3 and Nb 2 o 5 , the sintering temperature was 1130° C., and the other steps and conditions were the same as those in Reference Example 1.

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Abstract

The invention provides a bismuth-calcium niobate-based piezoelectric ceramic, the A site of the piezoelectric ceramic is doped with Na + , La 3+ and Bi 3+ ; The piezoelectric ceramic (Bi 2 o 2 ) 2+ layer doped with La 3+ . Bismuth-calcium niobate-based piezoelectric ceramics provided by the invention, by its (Bi 2 o 2 ) 2+ Layer and A site are co-doped, and the distortion of its lattice is regulated, so that it produces a local inhomogeneous structure, such as polarized nano-domains, which improves the remanent polarization, piezoelectric performance and temperature of the high-temperature piezoelectric ceramics. stability. The invention also provides the preparation method and application of the calcium bismuth niobate-based piezoelectric ceramic.

Description

technical field [0001] The invention relates to the field of high-temperature piezoelectric ceramics, in particular to bismuth-calcium niobate-based high-temperature piezoelectric ceramics. Background technique [0002] Piezoelectric ceramic materials are widely used in transducers, actuators, piezoelectric sensors, resonators and other fields due to their electromechanical conversion properties. Among them, the piezoelectric material is used as the core sensitive element of the piezoelectric vibration sensor, and the positive piezoelectric effect is used to convert the input vibration signal into a charge signal for measurement. In the health monitoring of aero-engines, nuclear power plant turbines, etc., sensors are required to withstand high temperatures (≥500°C) and work reliably for a long time, especially high-temperature vibration sensors of the 538, 649 and 760°C series. However, the current commercial PZT (lead zirconate-lead titanate solid solution) piezoelectric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622G01H11/08H01L41/187H01L41/39H01L41/43H10N30/093H10N30/097H10N30/853
CPCC04B35/495C04B35/622G01H11/08C04B2235/442C04B2235/3227C04B2235/3298C04B2235/606C04B2235/6562C04B2235/6567C04B2235/96H10N30/853H10N30/093H10N30/097
Inventor 杨斌余红财
Owner HUNAN UNIV