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Bismuth ferrite/lead titanate based functional ceramic material and preparation method thereof

A bismuth ferrite lead titanate-based, functional ceramic technology, applied in the field of ferrous functional ceramic materials, can solve the problems of inability to obtain saturated hysteresis loops, failure to put into use, and many chemical defects, and achieve improved breakdown field strength The effect of ferroelectric properties, reduced lattice stress, and simple process

Active Publication Date: 2021-05-28
XI AN JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

Currently, BiFeO 3 -PbTiO 3 Most of the base ceramics are prepared by the traditional solid-state method, but it is difficult to sinter into ceramics, and often has impurity phases (especially BiFeO 3 components with higher content), many chemical defects, poor electrical properties, and the inability to obtain saturated hysteresis loops, etc., so they cannot be put into use
In recent years, it has been reported that high-quality BFPT-based ceramics can be prepared by combining hot pressing technology and high-energy ball milling [Amorín, H., et.al., M. Multiferroism and enhancement of material properties across themorphotropic phase boundary of BiFeO 3 -PbTiO 3 .Journal of Appied Physics,,115,104104(2014)], but the prepared ceramic samples need to be quenched at high temperature to obtain the saturation hysteresis loop
This preparation method has the disadvantages of high process cost, complicated process, and high energy consumption.

Method used

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  • Bismuth ferrite/lead titanate based functional ceramic material and preparation method thereof
  • Bismuth ferrite/lead titanate based functional ceramic material and preparation method thereof
  • Bismuth ferrite/lead titanate based functional ceramic material and preparation method thereof

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preparation example Construction

[0032] A preparation method of bismuth ferrite lead titanate-based functional ceramic material, comprising the following steps:

[0033] Step 1, take required raw material by stoichiometric ratio, each raw material molar ratio is: Fe 2 o 3 :X 2 o 3 :TiO 2 :PbO:Bi 2 o 3 =x:0.1x:(1-x):(1-x):0.9x, 0.6≤x≤0.9, X 2 o 3 It is the rare earth oxide used for modification, and the raw material is fully mixed and ground to a smaller particle size to obtain the raw material;

[0034] Step 2. Pre-press the homogeneously mixed raw material obtained in Step 1 in a mold with a pressure of 100 MPa-500 MPa, and then place it in a high-temperature reaction furnace and heat it up to 700°C-950°C for pre-sintering. Compared with traditional In terms of a heating rate of 5°C / min, the present invention adopts a heating rate as high as 10°C / min-20°C / min, and keeps the temperature for 60min-200min to obtain a pre-sintered sample;

[0035] Step 3. Put the pre-sintered sample obtained in Step 2 i...

Embodiment 1

[0039] A Dy (dysprosium)-doped 0.9BiFeO prepared by an improved solid-state sintering process 3 -0.1PbTiO 3 Functional ceramic material, the chemical composition is 0.9Bi 0.9 Dy 0.1 FeO 3 -0.1PbTiO 3 , referred to as Dy-PT10. Including the following steps:

[0040] Step 1: Take the required raw materials according to the stoichiometric ratio: the molar ratio of each raw material is: Fe 2 o 3 : Dy 2 o 3 : TiO 2 :PbO:Bi 2 o 3 :=0.9:0.09:0.2:0.2:0.81, fully mix the raw materials and grind them to obtain the raw materials.

[0041] Step 2: The uniformly mixed raw material obtained in step 1 is pre-pressed in a mold with a pressure of 100 MPa, and then placed in a high-temperature reaction furnace to raise the temperature to 700°C and then held for 200 minutes for pre-sintering to obtain a pre-sintered sample. Compared with the traditional process, a higher heating rate is adopted here: 10°C / min;

[0042] Step 3: Put the pre-sintered sample obtained in step 2 into a m...

Embodiment 2

[0046] A Dy-doped 0.75BiFeO prepared by an improved solid-state sintering process 3 -0.25PbTiO 3 Functional ceramic material, the chemical composition is 0.75Bi 0.9 Dy 0.1 FeO 3 -0.25PbTiO 3 , referred to as Dy-PT25. Including the following steps:

[0047] Step 1: Take the required raw materials according to the stoichiometric ratio: the molar ratio of each raw material is: Fe 2 o 3 : Dy 2 o 3 : TiO 2 :PbO:Bi 2 o 3 :=0.75:0.075:0.5:0.5:0.675, fully mix the raw materials evenly and grind to obtain the raw material.

[0048] Step 2: Pre-press the homogeneously mixed raw material obtained in Step 1 in a mold with a pressure of 200 MPa, and then place it in a high-temperature reaction furnace to raise the temperature to 800°C. Compared with the traditional process, a higher heating rate is adopted here. It can reach 12°C / min, keep warm for 100min, and obtain pre-sintered samples.

[0049] Step 3: Put the pre-sintered sample obtained in step 2 into a mortar for second...

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Abstract

The invention discloses a bismuth ferrite / lead titanate based functional ceramic material and a preparation method thereof. The preparation method comprises the following steps: weighing required raw materials according to a stoichiometric ratio, fully and uniformly mixing the raw materials, grinding the raw materials to a relatively small particle size to obtain an original material, prepressing the original material into a sheet, and pre-sintering the sheet in a high-temperature reaction furnace; grinding the sample obtained through presintering in a mortar into powder with the appropriate particle size for the second time, adding a binder for granulation, and conducting the tabletting and shaping on the sample again in a high-temperature reaction furnace, heating the sample to 500 DEG C and conducting heat preservation for 30 min for viscosity removal, and heating the sample to the target sintering temperature of 1000-1300 DEG C at the high temperature rising rate, meanwhile, feeding oxygen into the furnace, and performing heat preservation for 100-300 min; finally, conducting in-furnace cooling to the room temperature to obtain a target ceramic sample. The ceramic crystal phase structure is a pure perovskite phase, has excellent multifunctionality, shows a saturated ferroelectric hysteresis loop, has the maximum ferroelectric polarization exceeding 70 [mu] C / cm < 2 >, has significant piezoelectric response, has the positive piezoelectric coefficient exceeding 100 pC / N, the inverse piezoelectric coefficient reaching 200 pm / V and the like.

Description

technical field [0001] The invention belongs to the technical field of ferrous functional ceramic materials, and in particular relates to a bismuth ferrite lead titanate-based functional ceramic material and a preparation method thereof. Background technique [0002] BiFeO 3 -PbTiO 3 Base (bismuth ferrite lead titanate base) perovskite-type iron functional materials have ferroelectric, piezoelectric, magnetic properties, and high phase transition temperature at the same time, in the fields of ferroelectric memories, piezoelectric drivers, sensors, transducers, etc. There are broad application prospects. Functional ceramics such as PZT piezoelectric ceramics have a wide range of applications, such as ultrasonic probes, sonar devices, sensors and so on. However, the current materials cannot meet the extreme use environment, such as aerospace automotive engines and other fields that require high temperature working conditions. [0003] while BiFeO 3 -PbTiO 3 Based functio...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/622C04B35/64
CPCC04B35/2641C04B35/622C04B35/64C04B2235/6583C04B2235/3224C04B2235/3298C04B2235/3234C04B2235/3296
Inventor 庄建唐卓华鲁金明任巍
Owner XI AN JIAOTONG UNIV
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