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Barium strontium titanate pyroelectric ceramic prepared from uniform fine grains and preparation method thereof

A technology of pyroelectric ceramics and barium strontium titanate, which is applied in the field of uniform fine-grain barium strontium titanate pyroelectric ceramics and its preparation, can solve problems such as difficulty in obtaining uniform fine-grain BST pyroelectric ceramics, and achieve Solve the effect of large and uneven grain size, uniform grain size and high performance

Inactive Publication Date: 2015-06-17
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to overcome the problem that it is difficult to obtain uniform fine-grained BST pyroelectric ceramics in the prior art, and the present invention provides a uniform fine-grained BST pyroelectric ceramics and a preparation method thereof

Method used

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  • Barium strontium titanate pyroelectric ceramic prepared from uniform fine grains and preparation method thereof
  • Barium strontium titanate pyroelectric ceramic prepared from uniform fine grains and preparation method thereof
  • Barium strontium titanate pyroelectric ceramic prepared from uniform fine grains and preparation method thereof

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preparation example Construction

[0035] More specifically, the preparation method of the uniform fine-grain barium strontium titanate pyroelectric ceramics includes:

[0036] (1) Weigh the raw material BaCO according to the stoichiometric ratio 3 , SrCO 3 、TiO 2 , Fe 2 o 3 , MnCO 3 And the oxide of A, mixed evenly by wet ball milling process, after drying, add 4-10wt% deionized water according to the weight of the raw materials to briquetting, and keep warm at 1000-1200°C for 1-2 Obtain strontium barium titanate block in 3 hours; Then the gained strontium barium titanate block is pulverized and sieved to obtain (Ba 1-x Sr x ) 1-a-b A a+b Ti 1-a-b Fe a mn b o 3 Powder;

[0037] (2) Income (Ba 1-x Sr x ) 1-a-b A a+b Ti 1-a-b Fe a mn b o 3 The powder is mixed evenly by wet ball milling process, after drying, a specified amount of binder is added, after granulation, aging, sieving, pre-pressing, isostatic pressing molding, and plastic discharge to obtain the barium strontium titanate green bo...

Embodiment 1

[0049] Embodiment 1 (preparation 6mol, 1313.87 grams)

[0050] Weigh raw material powder BaCO 3 (849.14g), SrCO 3 (249.09g) and TiO 2 (475.55g), and Fe 2 o 3 (4.45g), MnCO 3 (1.66g) and Y 2 o 3 (7.86) gram powder, all powders are mixed evenly with wet ball milling process; The mass ratio of material, ball milling medium and deionized water is 1:1.5:1.2, and the ball milling time is 24 hours, and ball milling medium is agate ball;

[0051] Dry the abrasive, add deionized water with 4% of the total powder mass, briquette, and synthesize in the air at a synthesis temperature of 1150°C and a holding time of 2 hours to obtain BST blocks; pulverize, pass through a 40-mesh sieve, and use wet The ball milling process makes the powder mix evenly; the mass ratio of material, ball milling medium and deionized water is 1:2.0:0.8, the ball milling time is 48 hours, and the ball milling medium is agate ball;

[0052] Drying, adding PVA solution as a binder, granulating, aging for 24...

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Abstract

The invention relates to barium strontium titanate pyroelectric ceramic prepared from uniform fine grains and a preparation method thereof. The composition chemical formula of the barium strontium titanate pyroelectric ceramic is (Ba(1-x)Srx) (1-a-b)A(a+b)Ti(1-a-b)FeaMnbO3, wherein x is greater than or equal to 0.20 and smaller than or equal to 0.35, a is greater than 0 and smaller than or equal to 0.01. b is greater than 0 and smaller than or equal to 0.005, and A is selected from Y, Sm and / or La.

Description

technical field [0001] The invention relates to a uniform fine-grain barium strontium titanate pyroelectric ceramic and a preparation method thereof, belonging to the technical field of pyroelectric ceramic materials. Background technique [0002] Barium strontium titanate (Ba x Sr 1-x TiO 3 (0<x<1), BST) ceramic materials have the characteristics of adjustable Curie temperature, high dielectric constant, and high pyroelectric coefficient, making them an important candidate material for pyroelectric uncooled infrared focal planes. [0003] When making uncooled infrared focal plane devices, BST pyroelectric ceramics must first be thinned to less than 20 μm, and can only work after adding a certain bias electric field. If the grain size of the ceramic is too large, some grains will be pulled out during processing, leaving larger holes, causing various impurities or conductive substances to enter the holes in the subsequent processing, and the insulation performance of...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 毛朝梁姚春华董显林王根水曹菲闫世光
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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