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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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

Examples

Experimental program
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Example Embodiment

[0035] More specifically, the preparation method of the uniform fine-grained 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 oxides of A, mixed uniformly by wet ball milling process, after drying, adding 4-10wt% deionized water according to the weight of the raw materials for briquetting, and keeping the temperature at 1000-1200 ℃ for 1- The barium strontium titanate was obtained in 3 hours; then the obtained barium strontium titanate was 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 uniformly mixed by wet ball milling process, dried and added with a specified amount of binder, and then pre-pressed, isostatically pressed, and molded to obtain a green body of barium strontium titanate after granula...

Example Embodiment

[0049] Example 1 (preparation of 6 mol, 1313.87 g)

[0050] Weigh the raw 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) grams of powder, all powders are mixed evenly by wet ball milling process; the mass ratio of material, ball milling medium and deionized water is 1:1.5:1.2, the ball milling time is 24 hours, and the ball milling medium is agate balls;

[0051] Dry the abrasive, add 4% of the total powder mass in deionized water, 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, use a The ball milling process makes the powder evenly mixed; 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 balls;

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

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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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