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Ternary system sodium bismuth titanate base leadless piezoelectric ceramics material and preparation method thereof

A technology based on lead-free piezoelectric and ceramic materials, applied in the field of ternary sodium bismuth titanate-based lead-free piezoelectric ceramic materials and their preparation, can solve the problem of low depolarization temperature, small mechanical quality factor, limited development, etc. problem to achieve good piezoelectric and dielectric properties

Inactive Publication Date: 2009-03-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the BNKB ceramics in the quasicrystalline phase boundary region have the disadvantages of low depolarization temperature (about 100°C), small mechanical quality factor (generally less than 100), etc.
However, the current work on the doping modification of ternary bismuth sodium titanate-based lead-free piezoelectric ceramics (BNKB) is limited, especially the improvement of depolarization temperature and mechanical quality factor under the premise of maintaining its piezoelectric properties. research, very few

Method used

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  • Ternary system sodium bismuth titanate base leadless piezoelectric ceramics material and preparation method thereof
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  • Ternary system sodium bismuth titanate base leadless piezoelectric ceramics material and preparation method thereof

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Embodiment 1

[0023] 1) raw material anhydrous sodium carbonate, anhydrous potassium carbonate, bismuth oxide, titanium dioxide, barium carbonate and dicobalt oxide are pressed chemical formula 85Bi 1 / 2 Na 1 / 2 TiO 3 -12Bi 1 / 2 K 1 / 2 TiO 3 -3BaTiO 3 -0.5Co 2 o 3 Carry out material preparation and mix, obtain mixture powder;

[0024] 2) Using absolute ethanol as the medium, ball mill the mixture powder for 8 hours, discharge and dry, extrude into a block with a pressure of 40MPa, heat up to 850°C, and keep warm for 2 hours to pre-synthesize the block; Dehydrated alcohol is the medium ball mill for 12 hours, and the material is discharged and dried to obtain a powder, and the concentration of 18% polyvinyl alcohol binder solution accounting for 20% of the powder weight is added to the powder, and the mixture is mixed, combined, and coarsely prepared. Rolling and finishing rolling to obtain ceramic diaphragms;

[0025] 3) Discharge the ceramic diaphragm at 720°C, heat it for 4 hours, pl...

Embodiment 2

[0028] 1) raw material anhydrous sodium carbonate, anhydrous potassium carbonate, bismuth oxide, titanium dioxide, barium carbonate and dicobalt oxide are pressed chemical formula 85Bi 1 / 2 Na 1 / 2 TiO 3 -12Bi 1 / 2 K 1 / 2 TiO 3 -3BaTiO 3 -1.5Co 2 o 3Carry out material preparation and mix, obtain mixture powder;

[0029] 2) Using absolute ethanol as the medium, ball mill the mixture powder for 8 hours, discharge and dry, extrude into a block with a pressure of 50 MPa, heat up to 800°C, and keep warm for 1 hour to pre-synthesize the block; Dehydrated alcohol is the medium ball mill for 12 hours, and the material is discharged and dried to obtain a powder, and the concentration of 18% polyvinyl alcohol binder solution accounting for 20% of the powder weight is added to the powder, and the mixture is mixed, combined, and coarsely prepared. Rolling and finishing rolling to obtain ceramic diaphragms;

[0030] 3) Discharge the ceramic diaphragm at 710°C, heat it for 2 hours, pla...

Embodiment 3

[0033] 1) raw material anhydrous sodium carbonate, anhydrous potassium carbonate, bismuth oxide, titanium dioxide, barium carbonate and dicobalt oxide are pressed chemical formula 90Bi 1 / 2 Na 1 / 2 TiO 3 -8Bi 1 / 2 K 1 / 2 TiO 3 -2BaTiO 3 -2.0Co 2 o 3 Carry out material preparation and mix, obtain mixture powder;

[0034] 2) Using absolute ethanol as the medium, ball mill the mixture powder for 8 hours, discharge and dry, extrude into a block with a pressure of 50 MPa, heat up to 800°C, and keep warm for 3 hours to pre-synthesize the block; Dehydrated alcohol is the medium ball mill for 12 hours, and the material is discharged and dried to obtain a powder, and the concentration of 18% polyvinyl alcohol binder solution accounting for 20% of the powder weight is added to the powder, and the mixture is mixed, combined, and coarsely prepared. Rolling and finishing rolling to obtain ceramic diaphragms;

[0035] 3) Discharge the diaphragm at 700°C, heat it for 2 hours, place it i...

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Abstract

The invention discloses a trinary sodium bismuth titanate based lead-free piezoelectric ceramic material and a method for preparing the same, and belongs to the field of functional ceramics and manufacture thereof. The invention aims to improve the depolarization temperature and mechanical quality factor of the prior trinary sodium bismuth titanate based lead-free piezoelectric ceramic material. The component of ceramic material of the invention is (100-x)Bi1 / 2Na1 / 2TiO3-xBaTiO3-yCo2O3, wherein x is more than or equal to 2 and less than or equal to 4, and y is more than or equal to 0.25 and less than or equal to 2.0. The method is to prepare the ceramic material from raw materials of natrium carbonicum calcinatum, anhydrous potassium carbonate, bismuth oxide, titanium dioxide, barium carbonate and cobalt sesquioxide through pre-synthesis, roll forming and sintering. The ceramic material prepared by the method has high depolarization temperature which is 157 DEG C, high mechanical quality factor which is 626, and excellent piezoelectric and dielectric properties and can be used for manufacturing intermediate frequency ceramic filters, resonators, piezoelectric gauges and actuators.

Description

technical field [0001] The invention belongs to the field of functional ceramics and its manufacture, and in particular relates to a ternary bismuth sodium titanate-based lead-free piezoelectric ceramic material and a preparation method thereof. Background technique [0002] Piezoelectric ferroelectric ceramics have excellent ferroelectricity, piezoelectricity, dielectricity, pyroelectricity, etc., and are widely used in functional ceramics, such as memories (ferroelectric applications), sensors, transducers, etc. Devices, filters (piezoelectric applications), infrared detectors (pyroelectric applications), capacitors (dielectric applications), etc., play an important role in the national economy and defense industry, and have formed a large-scale industry. At present, most of the piezoelectric ceramics used are lead-containing materials, of which lead oxide or lead tetraoxide accounts for about 70% of the total mass of raw materials. Such lead-containing materials are like...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 朱满康胡翰宸侯育冬王如志宋雪梅张铭汪浩王波严辉
Owner BEIJING UNIV OF TECH
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