High-dielectric property BST (Barium Strontium Titanate), preparation method thereof and dielectric ceramic prepared by adopting same
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A technology of strontium barium titanate and dielectric ceramics, applied in the field of its preparation, high dielectric performance strontium barium titanate, dielectric ceramics, can solve the problems of low electric strength, poor temperature stability and electric field stability, and achieve Excellent electrical properties, good uniformity, and high dielectric properties
Active Publication Date: 2017-04-26
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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[0005] The purpose of the present invention is to provide a high-dielectric ceramic material for the problems that the higher the dielectric constant is, the lower its electric strength i
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Embodiment 1
[0040] 1) Weigh chemically pure BaCO 3 (115.25g), SrCO 3 (46.31g), TiO 2 (79.80g), ZrO 2 (6.35g), CaO (2.30g), Bi 2 o 3 (11.65g) raw material, add 15.66g polyvinyl butyral as a dispersant, adopt wet method ball mill to mix evenly. The process parameters of wet ball milling are: the mass ratio of raw materials, zirconia balls, absolute ethanol and polyvinyl butyral is 1:5:6:0.06, and the ball milling time is 40 hours.
[0041] 2) After drying the ball-milled slurry in step 1) in the atmosphere, heat it at 1150° C. for 3 hours in the atmosphere to prepare barium strontium titanate raw material powder.
[0042] 3) then the raw material powder obtained in step 2 is ground and crossed a 60-mesh sieve to obtain (Ba 1-a Sr a ) 1-x- y Ca x Bi y Zr b Ti 1-b o 3 Raw material powder 235g.
[0043] 4) to step 3) gained (Ba 1-a Sr a ) 1-x-y Ca x Bi y Zr b Ti 1-b o 3 9.4 g of polyvinyl alcohol solution with a mass concentration of 3% was added to the raw material powd...
Embodiment 2
[0051] Weigh chemically pure BaCO 3 (108.84g), SrCO 3 (43.73g), TiO 2 (79.80g), ZrO 2 (6.35g), CaO (2.30g), Bi 2 o 3 (23.30g) raw material, add 15.66g polyvinyl butyral as a dispersant, adopt wet method ball mill to mix evenly. The process parameters of wet ball milling are: the mass ratio of raw materials, zirconia balls, absolute ethanol and polyvinyl butyral is 1:5:6:0.06, and the ball milling time is 40 hours.
[0052] 2) After drying the ball-milled slurry in step 1) in the atmosphere, heat it at 1150° C. for 3 hours in the atmosphere to prepare barium strontium titanate raw material powder.
[0053] 3) then the raw material powder obtained in step 2 is ground and crossed a 60-mesh sieve to obtain (Ba 1-a Sr a ) 1-x- y Ca x Bi y Zr b Ti1-b o 3 Raw material powder 235g.
[0054] 4) to step 3) gained (Ba 1-a Sr a ) 1-x-y Ca x Bi y Zr b Ti 1-b o 3 9.4 g of polyvinyl alcohol solution with a mass concentration of 3% was added to the raw material powder as...
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Abstract
The invention discloses high-dielectric property BST (Barium Strontium Titanate), a preparation method thereof and dielectric ceramic prepared by adopting the same, and aims to solve the problems that the higher the dielectric constant of an existing dielectric ceramic material is, the electric strength is lower, and the temperature stability and the electric field stability of the existing dielectric ceramic material are poorer. According to the high-dielectric property BST disclosed by the invention, composition design of high-dielectric property BST ceramic is optimized starting from an ABO3 type perovskite crystal structure and a dielectric micromechanism; by improving a preparation method of raw material powder and microscopic structure regulation and control and performance optimization of a ceramic sample, homogeneity and fine grain of the prepared raw material powder are realized, and higher sintering activity is obtained. The invention provides BST dielectric ceramic having both high dielectric constant and low dielectric loss and a preparation method thereof. The BST dielectric ceramic is simple in preparation technology, lower in cost and short in period, is suitable for large-batch production and can meet the demands of industrial application, materials provided by the BST dielectric ceramic can be used in high-power microwave device systems, actual application requirements are met, and a relatively wide application prospect is obtained.
Description
technical field [0001] The invention relates to the field of materials, especially the field of high-performance dielectric materials, and specifically relates to a barium strontium titanate with high dielectric properties, a preparation method thereof and a dielectric ceramic prepared by using the same. The invention belongs to the field of inorganic material dielectric ceramics and its preparation, and provides a strontium barium titanate dielectric ceramic with high dielectric performance and low dielectric loss and a preparation method thereof, which has high application value. Background technique [0002] Ceramic dielectric materials can generally be divided into two categories: one is linear materials, and the other is nonlinear dielectric materials. Linear dielectric materials have high dielectric strength, but their dielectric constant is low, generally not more than 300. As for the nonlinear dielectric material, although it has a high dielectric constant (it can b...
Claims
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