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Leadless piezoelectric ceramics with bismuth ion replacing modified potassium sodium niobate base and method for preparing same

A potassium-sodium niobate-based, lead-free piezoelectric technology, applied in chemical instruments and methods, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problems of reducing material performance and achieve densification Improvement, the upper limit of sintering temperature is increased, and the effect of avoiding residue

Inactive Publication Date: 2008-11-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although doping modification can improve the piezoelectric properties of materials, doping can easily leave residues in the grain boundaries of ceramics and reduce the performance of materials.

Method used

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  • Leadless piezoelectric ceramics with bismuth ion replacing modified potassium sodium niobate base and method for preparing same
  • Leadless piezoelectric ceramics with bismuth ion replacing modified potassium sodium niobate base and method for preparing same
  • Leadless piezoelectric ceramics with bismuth ion replacing modified potassium sodium niobate base and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The raw material of present embodiment comprises anhydrous potassium carbonate, anhydrous sodium carbonate, niobium pentoxide and bismuth trioxide, and its stoichiometric ratio is (K 0.5 Na 0.5 )NbO 3 .

[0019] The preparation process of this embodiment is:

[0020] (1) Analytical pure anhydrous potassium carbonate, anhydrous sodium carbonate, and niobium pentoxide were dried at 150°C for 5 hours, and the stoichiometric ratio was (Na 0.5 K 0.5 )NbO 3 ingredients.

[0021] (2) The raw material is ZrO in ethanol 2 The ball is a medium planetary ball mill for 24 hours, dried and ground to obtain a dry powder. Keep the obtained powder in the air at 900°C for 5 hours. The calcined powder is manually ground and calcined again in the air at 900°C for 5 hours. After grinding and sieving, the potassium sodium niobate powder with perovskite phase is obtained.

[0022] (3) Put the pre-burned potassium sodium niobate powder in ethanol for another 12 hours and mix it by pla...

Embodiment 2

[0029] (1) Place analytically pure anhydrous potassium carbonate, anhydrous sodium carbonate, niobium pentoxide and bismuth trioxide at 150°C for 5 hours, and the stoichiometric ratio is (K 0.5 Na 0.5 ) 0.997 Bi 0.001 NbO 3 ingredients.

[0030] (2) The raw material is ZrO in ethanol 2 The ball is a medium planetary ball mill for 24 hours, dried and ground to obtain a dry powder. The obtained powder was kept at 900°C in air for 5 hours, the calcined powder was manually ground and calcined again in 900°C in air for 5 hours, and the powder with perovskite phase was obtained after grinding and sieving.

[0031] (3) The pre-burned powder was mixed again by planetary ball milling in ethanol for 12 hours. After drying the mixed material, polyvinyl alcohol was added to manually grind and granulate (60 mesh sieve), and dry-pressed under 300MPa pressure to form a diameter of 12mm. A wafer blank with a thickness of 1.5mm.

[0032] (4) Slowly raise the temperature of the green bod...

Embodiment 3

[0038] (1) Place analytically pure anhydrous potassium carbonate, anhydrous sodium carbonate, niobium pentoxide and bismuth trioxide at 150°C for 5 hours, and the stoichiometric ratio is (K 0.5 Na 0.5 ) 0.99 1Bi 0.003 NbO 3 ingredients.

[0039] (2) The raw material is ZrO in ethanol 2 The ball is a medium planetary ball mill for 24 hours, dried and ground to obtain a dry powder. The obtained powder was kept at 950°C in air for 5 hours, the calcined powder was manually ground and calcined again in 950°C in air for 5 hours, and the powder with perovskite phase was obtained after grinding and sieving.

[0040] (3) Mix the pre-burned powder in ethanol by planetary ball mill again for 24 hours, add polyvinyl alcohol to manually grind and granulate (60 mesh sieve) after drying the mixed material, and dry press to form a diameter of 12mm under a pressure of 300MPa. A wafer blank with a thickness of 1.5mm.

[0041] (4) Slowly raise the temperature of the green body to 500°C in...

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Abstract

The invention relates to a modified potassium-sodium niobate based leadless piezoelectric ceramics substituted by bismuth ion and a preparation method thereof; the raw materials includes anhydrous potassium carbonate, anhydrous sodium carbonate, niobium pentaoxide and dibismuth trioxide; the stoichiometric ratio thereof is ((K0.5Na0.5)1-3xBix)NbO3(x is more than or equal to 0.0 and less than or equal to 0.05), wherein, x is more than or equal to 0.0 and less than or equal to 0.5; the bismuth ion is added to replace the ion at A position in (K0.5Na0.5)NbO3 ceramics, thus improving sintering characteristics and ferroelectric properties of potassium-sodium niobate ceramics and further enhancing piezoelectric properties thereof. During preparation, according to the principle of electrical valence equilibrium, the bismuth ion is added and K ion and Na ion are reduced at the same time, thus generating the vacancy at the A position and avoiding the formation of residual matter; therefore, the piezoelectric properties d33 and kp can reach 164pC / N and 47% respectively; moreover, the invention is characterized by broad source of the raw materials, good stability of the technique and no environment pollution.

Description

1. Technical field [0001] The invention relates to the technical field of preparation of functional ceramics, in particular to potassium sodium niobate-based lead-free piezoelectric ceramics modified by the substitution of bismuth ions and a preparation method thereof. 2. Background technology [0002] Piezoelectric ceramics are increasingly used in commercial, military, automotive, computer, medical and consumer fields due to their unique properties. For a long time, the research and production of piezoelectric ceramics have mainly focused on the traditional lead zirconate titanate Pb(Zr,Ti)O 3 (referred to as PZT) series piezoelectric ceramics. However, traditional lead zirconate titanate ceramics are a class of lead-containing ceramics, in which lead oxide (or lead tetraoxide) accounts for about 70% of the total mass of raw materials. Piezoelectric ceramics containing lead will cause great damage to the environment and human health in the process of preparation, use and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/626C04B35/634C01G33/00H01L41/187H10N30/853
Inventor 杜红亮刘代军周万城罗发朱冬梅苏晓磊王晓燕
Owner NORTHWESTERN POLYTECHNICAL UNIV
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