Textured columbate leadless piezoelectric materials and method for making same

A lead-free piezoelectric and niobate technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve problems such as difficulty in achieving densification and sintering

Inactive Publication Date: 2005-11-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because Li, Na, and K are easy to volatilize, it is difficult to achieve densification and sintering by conventional methods.

Method used

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  • Textured columbate leadless piezoelectric materials and method for making same
  • Textured columbate leadless piezoelectric materials and method for making same
  • Textured columbate leadless piezoelectric materials and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The synthesis of flake strontium titanate is carried out in two steps:

[0030] The first step is to synthesize the flake precursor Sr by molten salt method in flux 3 Ti 2 o 7 , first press SrCO 3 :TiO 2 = 2.7 ~ 3.5: 2.0 molar ratio weighing, grinding and mixing in ethanol solution for ≥ 8 hours, then adding the flux KCl or the mixture of NaCl and KCl to the slurry according to 35 ~ 65wt% of the dry material, mixing and drying , heat the obtained powder at 1300°C for ≥ 2 hours, cool with the furnace, and obtain the precursor powder Sr after washing 3 Ti 2 o 7 ; the second step through SrTiO 3 Growth primitives in flaky crystal Sr 3 Ti 2 o 7 Superposition on the interface, the precursor Sr obtained in the first step 3 Ti 2 o 7 with TiO 2 Mix in ethanol liquid at a molar ratio of 1:0.7~1.5, stir gently for 30 minutes, add flux KCl or a mixture of NaCl and KCl to the slurry according to 35~65wt% of dry material, and dry the powder at 1150 ~1250℃ heat preserv...

Embodiment 2

[0032] By KNNT and SrTiO 3 The volume ratio is 1:0.01 to prepare lead-free piezoelectric ceramics. The mixed solvent that adopts dehydrated alcohol and butanone volume ratio is 2: 1 composition, and the volume ratio of solvent and mixed powder is 1: 1, and the mixing amount of dispersant, binding agent and plasticizer is respectively the total amount of mixed powder. 1.04wt%, 2.22wt%, 3.86wt%, cold isostatic pressing pressure 400MPa, hot pressing temperature 1000°C, time 1 hour; sintering temperature 1170°C in air atmosphere, sintering time 3 hours.

Embodiment 3

[0034] By KNNT and SrTiO 3 The volume ratio is 1:0.03 to prepare lead-free piezoelectric ceramics. The mixed solvent that adopts dehydrated alcohol and methyl ethyl ketone volume ratio to be 2: 1 composition, the volume ratio of solvent and mixed powder is 2: 1, and the mixing amount of dispersant, binding agent and plasticizer is respectively the total amount of mixed powder. The amount is 1.04wt%, 2.25wt%, 3.96wt%, the cold isostatic pressing pressure is 400MPa, the hot pressing treatment temperature is 1100°C, and the time is 0.5 hours; the sintering temperature is 1180°C in air atmosphere, and the sintering time is 4 hours.

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PUM

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Abstract

The invention relates a texture-type niobate leadless piezoelectric ceramic material and its preparation method. Said ceramic material, which is mixed with 1-30mol% of surface orientation sheet-like formwork material, mainly contains (K0.44Na0.52Li0.04)(Nb0.84Ta0.10Sb0.06)O3. The method for making comprises the following steps: according to stoichiometric ratio mixing powders of KHCO3, NaHCO3, Li2CO3, Nb2O5, Ta2O5 and Sb2O5; adding alcohol to mixture to be processed in ball mill; drying it and adding adhesive to it; pressing it to block and presintering; comminuting and grinding; and so on. The invention can increase piezoelectric performance greatly.

Description

technical field [0001] The invention relates to a textured niobate lead-free piezoelectric ceramic material and a preparation method thereof, in particular to a sheet-like SrTiO with (001) orientation 3 Doping modification for the template material (K 0.44 Na 0.52 Li 0.04 )(Nb 0.84 Ta 0.10 Sb 0.06 )O 3 A (KNNT) niobate lead-free piezoelectric ceramic material and a preparation method thereof. Background technique [0002] Piezoelectric materials are widely used in the detection, transfer, storage and processing of various information, and are widely used in many high-tech fields such as information, aerospace, laser and biology. However, so far, most piezoelectric materials are still is leaded. Among them, lead oxide or lead tetraoxide accounts for about 70% of the total weight of raw materials, which will cause serious harm to human health and the ecological environment in the process of production, use and disposal of these materials, which is in line with the sust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495
Inventor 曹明贺刘韩星王万强罗大兵郝华
Owner WUHAN UNIV OF TECH
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