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Barium titanate ceramic material with adjustable diffuse phase transition region and preparation method thereof

A ceramic material, barium titanate technology, applied in the field of barium titanate ceramic material with adjustable diffusion type phase change region and its preparation, can solve problems such as weak piezoelectric performance, and achieve improved piezoelectric performance and good piezoelectric performance and temperature stability, piezoelectric performance improvement effect

Active Publication Date: 2019-07-23
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the technical problem of weak piezoelectric performance of the existing pure barium titanate ceramic material, and provides a barium titanate ceramic material with adjustable diffusion-type phase transition region and its preparation method

Method used

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  • Barium titanate ceramic material with adjustable diffuse phase transition region and preparation method thereof
  • Barium titanate ceramic material with adjustable diffuse phase transition region and preparation method thereof
  • Barium titanate ceramic material with adjustable diffuse phase transition region and preparation method thereof

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specific Embodiment approach 1

[0036] Specific Embodiment 1: In this embodiment, a barium titanate ceramic material with adjustable diffusion-type phase transition region, the chemical formula is (xAlN / (1-x)BT) n , wherein, the number n of ceramic material layers is 2 or 3 layers, and x=0.03-0.08.

specific Embodiment approach 2

[0037] Embodiment 2: The method for preparing a barium titanate ceramic material with an adjustable diffusion-type phase transition region described in Embodiment 1 is carried out according to the following steps:

[0038] One, according to the molar percentage of aluminum nitride and barium titanate is x: (1-x), wherein x is 0.03~0.08, weigh barium titanate powder and aluminum nitride powder;

[0039] 2. Put the barium titanate powder and aluminum nitride powder weighed in step 1 into a ball mill for ball mill mixing to obtain a slurry;

[0040]3. Dry the slurry obtained in step 2 to obtain a mixed powder;

[0041] 4. Sieve the mixed powder obtained in step 3 to obtain a prefabricated powder;

[0042] 5. Add polyvinyl alcohol to the prefabricated powder prepared in step 4 to granulate to obtain mixed granules;

[0043] 6. Control the pressure of the mixture particles obtained in step 5 to 8-12 MPa, and keep the pressure for 1-10 minutes to obtain discs;

[0044] 7. Repeat ...

specific Embodiment approach 3

[0048] Specific embodiment three: the difference between this embodiment and specific embodiment two is: in the ball mill in the step 2, use dehydrated alcohol and zirconia grinding balls as the ball milling medium, and the control ball-to-material ratio is (5~10): 1, and the rotating speed is 300~350r / min, ball milling time is 6~12h. Others are the same as in the second embodiment.

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Abstract

Disclosed are a barium titanate ceramic material with an adjustable diffuse phase transition region and a preparation method thereof. The invention relates to the field of lead-free ferroelectric ceramic materials, and concretely relates to the barium titanate ceramic material with the adjustable diffuse phase transition region and the preparation method thereof. The invention aims to solve the technical problem of weak piezoelectric performance of a conventional pure barium titanate ceramic material. A chemical formula of the barium titanate ceramic material is (xAlN / (1-x)BT)n. The method includes the following steps: a solid phase synthetic method is used to make the barium titanate ceramic material have obvious diffuse phase transition by adopting AlN, and the multilayer ceramic material with adjustable diffuse phase transition region width, excellent electrical properties and graded components is obtained by adjusting the doping content of the AlN and a number of layers of the xAlN / (1-x)BT ceramic. The preparation process of the invention is simple, and the barium titanate ceramic material with the adjustable diffuse phase transition region and excellent performance can be obtained without fine powder and a special sintering process. The preparation method of the invention is used for preparing the multilayer barium titanate ceramic material with the adjustable diffuse phase transition region.

Description

technical field [0001] The invention relates to the field of lead-free ferroelectric ceramic materials, in particular to a barium titanate ceramic material with an adjustable diffusion-type phase transition region and a preparation method thereof. Background technique [0002] Barium titanate (BaTiO 3 ) Ceramic materials are mainly used as dielectric materials in most cases because of their good dielectric and ferroelectric properties. For example, barium titanate materials are widely used in multilayer ceramic capacitors (MLCC), PTC thermal Resistors, ferroelectric random access memory, pyroelectric detectors, etc. Generally for a typical ferroelectric such as BaTiO 3 , when the temperature is higher than the Curie temperature T C , a paraelectric-ferroelectric phase (T-C) transition will occur, which corresponds to a sharper phase transition peak in the dielectric constant versus temperature curve; for a typical relaxor ferroelectric, such as lead-magnesium-niobium (PbM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622C04B41/88
CPCC04B35/468C04B35/622C04B41/009C04B41/5116C04B41/88C04B2235/3865
Inventor 徐丹赵文杰陈明华
Owner HARBIN UNIV OF SCI & TECH
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