Relaxation ferroelectric lead-based ceramic material with high phase change temperature, excellent fatigue resistance and high electromechanical performance, and preparation method and application thereof

A technology of phase transition temperature and fatigue resistance, which is applied in the field of preparation and application of relaxor ferroelectric lead-based ceramic materials with high phase transition temperature, excellent fatigue resistance and high electromechanical performance, and can solve the problem of poor electrical fatigue resistance , can not take into account the problems of high electromechanical performance, high phase transition temperature, excellent fatigue resistance, low phase transition temperature, etc., to achieve the effect of improving the quality of directional texture, excellent fatigue resistance, and high phase transition temperature

Active Publication Date: 2022-05-06
HARBIN INST OF TECH
9 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of low phase transition temperature and poor electrical fatigue resistance of relaxor ferroelectric ceramic materials in the prior art, and cannot take into account high electromechanical performance, high phase transition temperature and excellent fatigue resistance, and contains ...
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Method used

Beneficial effect of this specific embodiment: this specific embodiment solves that existing technology prepares relaxor ferroelectric ceramic material to have phase transition temperature lower, electrical fatigue resistance performance is relatively poor, can't take into account high electromechanical performance, high phase transition temperature And the problems of excellent fatigue resistance, and also solve the thermodynamic problems in the preparation process of Zr-containing relaxor ferroelectric textured ceramics. The developed textured ceramics are composed of grains along the preferred orientation of [001]c or [111]c, and the preferred orientation degree is above 90%. The temperature Tc is higher than 220°C, the piezoelectric constant d33* is higher than 1000pm/V, and after 106 cycles of unipolar cyclic electric field (Emax is 3 times the coercive field of the material), the change rate of the maximum strain Smax of the material is lower than 3%, that is, the The material maintains a high phase transition temperature, excellent fatigue resistance and high electromechanical properties at the same time, which is significantly better than the ordinary non-textured r...
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Abstract

The invention discloses a relaxor ferroelectric lead-based ceramic material with high phase change temperature, excellent fatigue resistance and high electromechanical performance and a preparation method and application thereof, and relates to a relaxor ferroelectric lead-based ceramic material and a preparation method and application thereof. The problems that in the prior art, a relaxor ferroelectric ceramic material is low in phase change temperature and poor in electrical fatigue resistance, and high electromechanical performance, high phase change temperature and excellent fatigue resistance cannot be considered at the same time are solved, and the thermodynamic problem exists in the preparation process of Zr-containing relaxor ferroelectric texture ceramic. The general chemical formula of the relaxor ferroelectric lead-based ceramic material is (1-x-y) Pb (A, Nb) O < 3-x > PbZrO < 3-y > PbTiO < 3-a > wt.% B. The method comprises the following steps: 1, preparing pure perovskite phase parent fine powder; 2, preparing a ceramic green body by a tape casting method; and 3, preparing the textured ceramic material. The method is applied to piezoelectric actuators, intelligent sensors, ultrasonic transducers and energy collectors.

Technology Topic

Energy harvesterPiezoelectric actuators +9

Image

  • Relaxation ferroelectric lead-based ceramic material with high phase change temperature, excellent fatigue resistance and high electromechanical performance, and preparation method and application thereof
  • Relaxation ferroelectric lead-based ceramic material with high phase change temperature, excellent fatigue resistance and high electromechanical performance, and preparation method and application thereof
  • Relaxation ferroelectric lead-based ceramic material with high phase change temperature, excellent fatigue resistance and high electromechanical performance, and preparation method and application thereof

Examples

  • Experimental program(12)

Example Embodiment

[0029] Specific embodiment 1: this embodiment is a relaxor ferroelectric lead-based ceramic material with high phase transition temperature, excellent fatigue resistance and high electromechanical properties. Its general chemical formula is (1-x-y) Pb (a, Nb) O 3 -xPbZrO 3 -yPbTiO 3 -awt.% B. Where a is one or two of Mg, Yb, SC and in, and B is CuO and Li 2 CO 3 、ZnO、Sm 2 O 3 , PBO and B 2 O 3 One or two of them, 0.12 ≤ x ≤ 0.49, 0.25 ≤ y ≤ 0.49, and 1-x-y ≥ 0.10, 0 ≤ a ≤ 3;
[0030] The relaxor ferroelectric lead based ceramic material with high phase transition temperature, excellent fatigue resistance and high electromechanical properties is composed of Yan [001] c Or [111] c The preferred orientation degree is more than 90%;
[0031] The triangular tetragonal phase transition temperature T of the relaxor ferroelectric lead based ceramic material with high phase transition temperature, excellent fatigue resistance and high electromechanical properties r-t Above 150 ℃, Curie temperature T c Above 220 ℃, piezoelectric constant D 33 * Higher than 1000pm / V, the maximum field strength E in the circulating electric field max Is the material coercivity field E c Under the condition of 3 times, load 10 6 Maximum strain s after a single cycle of monopole electric field max The change rate is less than 3%.
[0032]Beneficial effects of this specific embodiment: this specific embodiment solves the problems of low phase transition temperature and poor electrical fatigue resistance in the preparation of relaxor ferroelectric ceramic materials in the prior art, which can not take into account high electromechanical properties, high phase transition temperature and excellent fatigue resistance, and also solves the thermodynamic problems in the preparation of relaxor ferroelectric texture ceramics containing Zr. The developed textured ceramics are made by Yan [001] c Or [111] c The preferred orientation degree is more than 90%, and the trilateral tetragonal phase transition temperature of the system is t r-t Above 150 ℃, Curie temperature T c Above 220 ℃, piezoelectric constant D 33 * Above 1000pm / V, load 10 6 Loop monopole cyclic electric field (E) max The maximum strain s of the material is 3 times of the material coercivity field) max The change rate is less than 3%, that is, the material maintains high phase transition temperature, excellent fatigue resistance and high electromechanical properties at the same time, which is significantly better than the ordinary texture free relaxor ferroelectric ceramic materials reported at present. It not only provides a design and preparation idea for the continuous development of new relaxor ferroelectric ceramic materials with high comprehensive properties, but also develops a new generation of electromechanical devices with high electrical properties and excellent stability and high reliability, such as piezoelectric actuators Smart sensors, ultrasonic transducers and energy collectors show great application potential, which is expected to greatly expand the practical range of this kind of materials.

Example Embodiment

[0033] Specific embodiment 2: this embodiment is a preparation method of relaxor ferroelectric lead-based ceramic material with high phase transition temperature, excellent fatigue resistance and high electromechanical properties, which is completed according to the following steps:
[0034] 1、 Preparation of pure perovskite phase parent fine powder:
[0035] ① (1-x-y) Pb (a, Nb) O according to the general chemical formula 3 -xPbZrO 3 -yPbTiO 3 -awt.% The stoichiometric ratio of B takes PbO powder, material powder containing a and Nb and ZrO 2 Powder, TiO 2 Powder and sintering aid powder B; Wherein, 0.12 ≤ x ≤ 0.49, 0.25 ≤ y ≤ 0.49, and 1-x-y ≥ 0.10, 0 ≤ a ≤ 3; The material powder containing a and Nb is MgNb 2 O 6 、YbNbO 4 、ScNbO 4 And innbo 4 One or both of them; The sintering aid powder B is CuO and Li 2 CO 3 、ZnO、Sm 2 O 3 , PBO and B 2 O 3 One or both of them;
[0036] ② . PbO powder, material powder containing a and Nb and ZrO taken symmetrically with anhydrous ethanol as the medium 2 Powder and TiO 2 The powder is milled for 24h ~ 72h and then dried to obtain the mixed raw materials. The mixed raw materials are pre burned for 1H ~ 6h by solid-state reaction method at the temperature of 700 ℃ ~ 850 ℃ to obtain the parent powder;
[0037] The parent powder is pure phase (1-x-y) Pb (a, Nb) o with particle size less than 400 nm 3 -xPbZrO 3 -yPbTiO 3 Parent powder;
[0038] ③ . using absolute ethanol as the medium, ball mill the parent powder and the weighed sintering additive powder B for 24h ~ 72h, and then dry to obtain the pure perovskite phase parent powder with sintering additives;
[0039] 2、 Preparation of ceramic green body by tape casting:
[0040] ① Weigh the pure perovskite phase parent powder and flake BaTiO with sintering additives according to the volume ratio of base material to template of 99:1 ~ 92.5:7.5 3 Template seed crystal; The flake BaTiO 3 Template seed crystal along {111} c Or {001} c Preferred orientation and diameter thickness ratio ≥ 8;
[0041] ② . the solvent, dispersant, binder, plasticizer and the weighed fine powder of pure perovskite phase with sintering additives are milled and mixed for 24h ~ 48h, and then the weighed flake BaTiO is added 3 The template seed crystal is ball milled for 15min ~ 40min and vacuumed for 1H ~ 6h to obtain the slurry. The slurry is cast and dried by a tape casting machine to obtain a thickness of 10 μ m~100 μ M, cut, stack, hot water uniform pressure, cut, discharge glue at the temperature of 500 ℃ ~ 650 ℃ and cold isostatic pressing at the pressure of 150MPa ~ 300mpa to obtain ceramic green body;
[0042] 3、 Preparation of textured ceramic materials:
[0043] The ceramic green body is put into a high-temperature furnace and sintered for 2h ~ 10h at the temperature of 1100 ℃ ~ 1275 ℃. The textured ceramics are obtained. The upper and lower surfaces of the textured ceramics perpendicular to the texture direction are polished, ultrasonically cleaned and dried respectively, and then the silver slurry is evenly coated on the two polished surfaces. Under the temperature of 450 ℃ ~ 650 ℃, it is kept warm for 5min ~ 60min, and finally placed in silicone oil, The preparation method is completed by applying an AC or DC electric field with a voltage of 15kV / cm ~ 70kv / cm for polarization.

Example Embodiment

[0044] Specific embodiment 3: the difference between this embodiment and specific embodiment 2 is: PbO powder, material powder containing a and Nb and ZrO described in step 1 ① 2 Powder, TiO 2 The purity of powder and sintering additive powder B is more than 99%; ZrO described in step 1 ① 2 Powder and TiO 2 The particle size of the powder is less than 70 nm. Others are the same as embodiment 2.

PUM

PropertyMeasurementUnit
Curie temperature>= 220.0°C
Piezoelectric constant>= 1000.0pm/V
Piezoelectric constant33.0 ~ 1000.0pm/V

Description & Claims & Application Information

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