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High-density barium strontium titanate ceramic and preparation method thereof
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A strontium barium titanate, dense technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., to achieve excellent electrical properties, high density, and broad application prospects
Active Publication Date: 2014-04-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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[0004] However, due to the fact that BST ceramics are difficult to sinter to achieve high density, in general, BST ceramics can only be sintered to a density below 96%. How to effectively increase the density of BST ceramics so that BST pyroelectric ceramics can meet the production requirements The requirement of uncooled infrared focal plane devices is a technical bottleneck in the current research of BST pyroelectric ceramics
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[0029] The preparation method provided by the invention may comprise the following steps:
[0030] 1) First according to the general formula (Ba 1-a-b Sr a Ca b ) 1-c A c Ti 1-d B d o 3 (03 , SrCO 3 , CaCO 3 and TiO 2 Powder, A, B source can use its oxide or carbonate, such as Y 2 o 3 , MnCO 3 Powder. The raw material powder is mixed evenly by wet ball milling process.
[0031] 2) After drying, briquette and synthesize in the air at a synthesis temperature of 1000-1200°C and a holding time of 1-3 hours to obtain BST blocks.
[0032] 3) Pulverize and sieve the BST block obtained in step 2), and then add a sintering aid ZnO, and use a wet ball milling process to mix the powder evenly.
[0033] 4) Dryingafter discharge, adding a certain amount of binder, pre-pressing after granulation, aging, sieving, isostatic pressing, and plastic discharge to obtain the BST embryo body.
[0048] Weigh BaCO 3 (796.3g), SrCO 3 (292.7g)TiO 2 (480.6g) powder, and add a small amount of Y 2 o 3 (4.7g), MnCO 3 (0.7g) powder, use wet ball milling process to mix all the powders evenly; 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;
[0049] Dry the abrasive, add deionized water with 4% of the total powder mass, briquette, and synthesize in air at a synthesis temperature of 1150°C and a holding time of 2 hours to obtain BST blocks; pulverize and pass through a 40-mesh sieve;
[0050] Add 2.7wt% ZnO powder, mix the powder evenly by wet ball milling process, 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;
[0051] Drying, adding PVA solution as a binder, granulating, aging for 24 hours, sieving, pre-pressing and isostatic pressing, the green body...
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Abstract
The invention relates to high-density bariumstrontiumtitanateceramic and a preparation method thereof. The high-density bariumstrontiumtitanateceramic comprises (Ba1-a-bSraCab)1-cAcTi1-dBdO3 powder and ZnO powder, wherein a is greater than 0 and less than 1; b is greater than or equal to 0 and is less than or equal to 0.3; c is greater than or equal to 0 and is less than or equal to 0.03; d is greater than or equal to 0 and is less than or equal to 0.01; A is selected from Y, La and Sm; B is selected from Mn, Fe, Cu, K, Na, Al and Mg; and the mass of the ZnO powder is 2 to 3 percent of that of the (Ba1-a-bSraCab)1-cAcTi1-dBdO3 powder. The BST (bariumstrontiumtitanate) pyroelectric ceramic disclosed by the invention has high density and excellent electrical property and can meet the requirement for manufacturing an uncooled infrared focal plane device.
Description
technical field [0001] The invention belongs to the field of preparation of inorganic materials, specifically relates to the technical field of pyroelectric ceramic materials, and provides a high-density barium strontium titanate ceramic and a preparation method thereof, in particular preparing high-density barium strontium titanate pyroelectric ceramics by adding a sintering aid ceramic method. Background technique [0002] Bariumstrontium titanate (Ba x Sr 1-x TiO 3 (0<x<1), BST) ceramic material has the characteristics of adjustable Curie temperature, high dielectric constant, low dielectric loss, high pyroelectric coefficient, etc., making it a pyroelectric uncooled infrared focal plane. important candidate material. [0003] When using BST pyroelectric ceramics to make uncooled infrared focal plane devices, it usually needs to be thinned to less than 30 microns, because the thin ceramic wafer can make the temperature change larger when absorbing the same infr...
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