Preparation method of lead magnesio-niobate-lead titanate ceramic

A technology of lead magnesium niobate and lead titanate, which is applied in the field of preparation of lead titanate ceramics, can solve the problems of large dielectric loss of lead magnesium niobate-lead titanate ceramics, and achieve high tuning rate and low dielectric loss , the effect of high dielectric constant

Inactive Publication Date: 2012-10-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency of large dielectric loss of lead magnesium niobate-lead titanate ceramics prepared by existing methods, the present invention provides a preparation method of lead magnesium niobate-lead titanate ceramics

Method used

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  • Preparation method of lead magnesio-niobate-lead titanate ceramic
  • Preparation method of lead magnesio-niobate-lead titanate ceramic

Examples

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Embodiment 1

[0020] Example 1, when x=0.01, weigh 0.8125g MgO, 5.3994g Nb by stoichiometric ratio 2 o 5 , Put the weighed material into the ball mill tank, mix the material and ball mill according to the ratio of zirconia ball: material: alcohol 3:1:1, and the ball milling time is 2 hours; dry the mixed material and briquette it. Carry out pre-synthesis at 1000°C, take out the calcined material and grind it to obtain magnesium niobate pre-calcined powder, then mix the magnesium niobate powder with 13.7389g PbO and 0.0492g TiO 2 , put it into a ball mill jar, mill for 4 hours, dry and sieve; pre-press the sieved powder into large pieces, pre-burn at 900°C for 8 hours, then crush the large pieces, sieve, and pre-press Form a disc with a diameter of 10mm and a thickness of 1mm, and then finally form it under an isostatic pressure of 200MPa; keep the formed disc at 1175°C for 4 hours; after sintering into porcelain, polish it, and then coat it with silver Slurry, at 500 ℃, heat preservation ...

Embodiment 2

[0022] Example 2, when x=0.03, weigh 0.7972g MgO, 5.2975g Nb by stoichiometric ratio 2 o 5 , Put the weighed material into the ball mill tank, mix the material and ball mill according to the ratio of zirconia ball: material: alcohol 3:1:1, and the ball milling time is 3 hours; dry the mixed material and briquetting, Pre-synthesis was carried out at a temperature of 1100°C, and the calcined material was taken out and ground to obtain a magnesium niobate calcined powder, and then the magnesium niobate powder was mixed with 13.7576g PbO and 0.1478g TiO 2 , put into a ball mill jar, mill for 6 hours, dry and sieve; pre-press the sieved powder into large pieces, pre-burn at 1000°C for 6 hours, then crush the large pieces, sieve, and pre-press Form into a disc with a diameter of 10mm and a thickness of 1mm, and then shape it under an isostatic pressure of 250MPa; keep the formed disc at 1200°C for 3 hours; after sintering into porcelain, polish it, and then coat it with silver past...

Embodiment 3

[0023] Example 3, when x=0.05, weigh 0.7445g MgO, 4.9472g Nb by stoichiometric ratio 2 o 5 , Put the weighed material into the ball mill tank, mix the ball mill according to the ratio of zirconia ball: material: alcohol 3:1:1, and the ball milling time is 4 hours; dry the mixed material and briquette it in the Pre-synthesis was carried out at a temperature of 1200°C, and the calcined material was taken out and ground to obtain a magnesium niobate calcined powder, and then the magnesium niobate powder was mixed with 13.1181g PbO and 0.2466g TiO 2 , put it into a ball mill jar, ball mill for another 8 hours, and sieve after drying; pre-press the sieved powder into large pieces, pre-burn them at 1100°C for 4 hours, then crush the large pieces, sieve, and pre-sieve. Press it into a disc with a diameter of 12mm and a thickness of 1.2mm, and then shape it under an isostatic pressure of 250MPa; keep the formed disc at 1225°C for 2 hours; after sintering into porcelain, polish it, an...

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Abstract

The invention discloses a preparation method of lead magnesio-niobate-lead titanate ceramic for solving the technical problem that dielectric loss of the lead magnesio-niobate-lead titanate ceramic prepared by the conventional method is large. The technical scheme is that: weighing and dosing analytically pure MgO (magnesium oxide), Nb2O5 (niobium oxide), PbO (lead oxide) and TiO2 (titanium dioxide) according to the chemical metering ratio (1-x)Pb(Mgl / 3Nb2 / 3)O3-xPbTiO3 (x is smaller than or equal to 0.07 and greater than or equal to 0.01); drying and pressing the materials into blocks after ball-milling, crushing the materials to obtain MgNb2O6 (magnesium niobium oxide) powder; adding TiO2 and PbO to MgNb2O6 powder and then ball-milling, and obtaining PMN-PT (lead magnesium niobate) powder by pressing and burning the material into large blocks; sieving and pre-pressing the PMN-PT powder into wafer, and carrying out isostatic pressing pressure molding; and carrying out heat preservation for 1-4 hours on the molded wafer at 1175-1250 DEG C, and then sintering the molded wafer into ceramic. Two systems are composited together, so that the prepared lead magnesio-niobate-lead titanate ceramic has combination properties of two different systems of lead magnesio and niobate-lead titanate, and has high dielectric constant under the condition that the temperature is 300K same as that of a background technology, meanwhile, lower dielectric loss and higher dielectric tenability are respectively kept at 0.007-0.011 and 63-87% at the same time.

Description

technical field [0001] The invention relates to a preparation method of lead titanate ceramics, in particular to a preparation method of lead magnesium niobate-lead titanate ceramics. Background technique [0002] Most researchers have focused on studying Ba x Sr 1-x TiO 3 ,(Sr,Pb)TiO 3 ,Ba(Zr,Ti)O 3 or (Ba,Sn)TiO 3 and other systems, but because of the problems of technology and proportion, the dielectric loss and dielectric tuning rate of these materials cannot meet the requirements of the instrument at the same time. [0003] The document "R. Wongmaneerung. R. Yimnirun. S. Ananta. Fabrication and characterization of perovskite ferroelectric PMN / PT ceramic nanocomposites. J Mater Sci (2009) 44: 5428-5440" discloses a lead magnesium niobate-lead titanate For the preparation method of ceramics, the literature used traditional ceramic preparation methods to prepare lead magnesium niobate-lead titanate ceramics. The PMN-PT ceramics prepared under the conditions of 300K ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/499C04B35/01
Inventor 樊慧庆彭彪林李强
Owner NORTHWESTERN POLYTECHNICAL UNIV
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