Preparation method of potassium-sodium niobate-potassium-bismuth titanate nano ceramics

A technology of bismuth potassium titanate and sodium potassium niobate, which is applied in the field of functional ceramics, can solve the problem of excessive grain size of sodium potassium niobate-bismuth potassium titanate ceramics, achieve the purpose of inhibiting grain growth and improving microscopic morphology , Improve the effect of sintering power

Inactive Publication Date: 2010-11-24
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0003] In order to overcome the shortcomings of the sodium potassium niobate-bismuth potassium titanate ceramics with too large crystal grains prepared in the prior art, the present invention adopts a sodium potassium niobate-bismuth potassium titanate solid solution system to provide a high-energy ball milling refin

Method used

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  • Preparation method of potassium-sodium niobate-potassium-bismuth titanate nano ceramics

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Embodiment 1

[0016] Using analytical grade niobium pentoxide, sodium carbonate, potassium carbonate, titanium dioxide, and bismuth trioxide powder as raw materials, after drying at 120°C for 24 hours, follow the chemical formula 0.85Na 0.5 K 0.5 NbO 3 -0.15Bi 0.5 K 0.5 TiO 3 Proportioning and weighing various raw material powders. The obtained powder is directly subjected to mechanical alloying ball milling without any special treatment. The quality of raw materials is 5% of the mass of the grinding ball; no ball milling medium is added, the milling time is 8 hours, and the rotation speed is 450 rpm; the powder after grinding Calcined at 850°C for 2 hours to fully react the raw material powders; figure 1 The XRD pattern of the powder is given, and the crystal grain size of the powder is 31 nanometers calculated by the Scherer formula. The calcined niobate material powder is granulated and placed in a metal mold with a diameter of 10 mm to be molded with a press at a pressure of 350 MPa, and ...

Embodiment 2

[0018] Using analytical grade niobium pentoxide, sodium carbonate, potassium carbonate, titanium dioxide, and bismuth trioxide powder as raw materials, after drying at 120°C for 24 hours, follow the chemical formula 0.80Na 0.5 K 0.5 NbO 3 -0.20Bi 0.5 K 0.5 TiO 3 Proportioning and weighing various raw material powders. The obtained powder is directly subjected to mechanical alloying ball milling without any special treatment. The quality of the raw material is 8% of the mass of the ball, without any ball milling medium, the ball milling time is 4 hours, and the rotation speed is 450 rpm; the powder after grinding Calcined at 950°C for 2 hours to fully react the raw material powders; pre-compress the calcined niobate material and put it into a vacuum bag, evacuate it, and put it into a hydraulic press at a pressure of 650 MPa and keep the pressure for 8 minutes; The green body was sintered at 1090°C for 4 hours to obtain a piezoelectric ceramic sample with a higher density. After...

Embodiment 3

[0020] Using analytically pure niobium pentoxide, sodium carbonate, potassium carbonate, titanium dioxide, and bismuth trioxide powder as raw materials, after drying at 120°C for 24 hours, follow the chemical formula 0.20Na 0.5 K 0.5 NbO 3 -0.80Bi 0.5 K 0.5 TiO 3 Proportioning and weighing various raw material powders. The obtained powder is directly subjected to mechanical alloying ball milling without any special treatment. The quality of the raw material is 15% of the mass of the milling ball. No ball milling medium is added. The milling time is 4 hours and the rotation speed is 400 rpm; the powder after grinding. Calcined at 650°C for 3 hours to fully react the raw material powder; put the calcined niobate material powder into a metal mold with a diameter of 10 mm and press it into a shape with a press at a pressure of 250 MPa. Then the green body was sintered at 1070°C for 2 hours to obtain a piezoelectric ceramic sample with a higher density. After sintering, the sample i...

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Abstract

The invention discloses a preparation method of potassium-sodium niobate-potassium-bismuth titanate nano ceramics. The potassium-sodium niobate-potassium-bismuth titanate contains niobium pentaoxide, sodium carbonate, potassium carbonate, titanium dioxide and dibismuth trioxide with the stoichiometric ratio of (1-x)[(Na0.5K0.5)NbO3]-x[(Bi0.5K0.5)TiO3], wherein x is more than 0.1 but less than 0.9; the potassium-sodium niobate-potassium-bismuth titanate nano ceramics is prepared by the procedures of material blending, high-energy ball milling of the mixed material, pre-sintering, cold isostatic pressing formation, high-temperature sintering, grinding and polishing and sputtering of gold electrode. According to the invention, since the grain size of the ceramics is effectively varied owing to the different ingredient proportions adopted, a series of electronic ceramics from micron level to nanometer level is prepared and further, the electronic ceramics with different piezoelectricity and dielectricity is prepared. The preparation method adopting the method of high-energy ball milling and appropriate chemical proportions achieves great simplicity, proper cost and excellent suitability for batch production.

Description

Technical field [0001] The invention relates to a preparation method of sodium potassium niobate-bismuth potassium titanate nano ceramics, and belongs to the field of functional ceramics. Background technique [0002] Literature "Ruzhong Zuo, Xusheng Fang, and Chun Ye, Phase structures and electrical properties of new lead-free Na 0.5 K 0.5 NbO 3 -Bi 0.5 Na 0.5 TiO 3 ceramics, APPLIED PHYSICS LETTERS 90, 092904 (2007)" Sodium potassium niobate-bismuth sodium titanate ceramics were prepared using traditional powdering methods combined with pressureless sintering methods. They used ordinary light balls (such as alumina balls, oxide balls). (Zirconium ball and agate ball) ball milling method, in the initial stage of powder preparation, it is difficult to make the original powder reach the nanometer level. In the subsequent sintering, the crystal grains further grow, so that the crystal grain size of the ceramic is about 1-5 Between micrometers, it is difficult to obtain dense nano-...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/475C04B35/622
Inventor 刘来君吴枚霞杨曌方亮胡长征
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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