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Hydro-thermal synthesis method for tantalum adulterated potassium sodium niobate leadless piezoelectric ceramic powder

A technology of hydrothermal synthesis, potassium and sodium niobate, applied in chemical instruments and methods, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve problems such as unsatisfactory piezoelectric performance

Inactive Publication Date: 2008-05-28
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

[0010] The hydrothermal synthesis of some piezoelectric ceramic powders, such as bismuth sodium titanate, potassium niobate, sodium niobate, potassium sodium niobate, etc., has been reported, but the hydrothermal synthesis of tantalum (Ta) doped potassium niobate Sodium has not been reported yet
Piezoelectric ceramics made of potassium sodium niobate powder synthesized by hydrothermal method, the piezoelectric performance of ceramics after sintering is not ideal

Method used

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  • Hydro-thermal synthesis method for tantalum adulterated potassium sodium niobate leadless piezoelectric ceramic powder
  • Hydro-thermal synthesis method for tantalum adulterated potassium sodium niobate leadless piezoelectric ceramic powder

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Embodiment 1

[0020] The process flow is as follows:

[0021] 1. Configuration concentration is the mixed solution of potassium hydroxide and sodium hydroxide of 6mol / L, wherein Na + and K + The molar ratios are 1:4-1:6 respectively;

[0022] 2. Weigh different masses of Nb respectively 2 o 5 and Ta 2 o 5 , and their mass molar ratios are respectively 0.9:0.1, 0.8:0.2, 0.7:0.3 and 0.6:0.4;

[0023] 3. Mix different proportions of powder with lye and add them to the PTFE lining, keep the filling degree of 50%, and stir mechanically for 30 minutes;

[0024] 4. Put the inner lining into a stainless steel hydrothermal kettle, put it into an oven for reaction, the temperature range is 200-250°C, and the time is 24-36 hours;

[0025] 5. After the reaction is complete, a white precipitate can be seen on the bottom of the inner substrate;

[0026] 6. Use deionized water to filter the white precipitate on the bottom of the inner substrate for several times until it becomes neutral, and put t...

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Abstract

The invention relates to a hydrothermal synthesis method for preparation of sodium-potassium niobate lead-free piezoelectric ceramic powder intermingled with tantalum, which belongs to the functional ceramic material field. The invention is characterized in that sodium hydroxide, potassium hydroxide, niobium pentaoxide and tantalum pentoxide are used as raw materials at the temperature ranging from 200 to 250 DEG C, and K0.5Na0.5NbO3 piezoelectric ceramic powder intermingled with Ta can be achieved by hydrothermal synthesis while preserving the heat for 20 to 36 hours; the molar ratio of the total added amount of niobium pentaoxide and tantalum pentoxide to alkali solution is 1:10 to 1:25, and the molar ratio of the added niobium pentaoxide to tantalum pentoxide is 1:9 to 4:6; the solution mixture ratio of sodium hydroxide to potassium hydroxide is 1:4 to 1:6, and the concentration of alkali solution is 4-10mol / L. The synthesis temperature is low and the powder grain is fine and average with a diameter about hundreds of nanometers in the invention. And the surface activity is great, which is favorable to the ceramic sintering at the latter stage.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, and relates to a method for hydrothermally synthesizing tantalum-doped potassium sodium niobate lead-free piezoelectric ceramic powder. Background technique [0002] Piezoelectric ceramics is a new type of functional ceramic material that converts changing forces into electricity or converts electricity into rotation and vibration. Since the Curie brothers first discovered the piezoelectric effect on quartz crystals in the 1880s, piezoelectric materials and piezoelectric materials The research and production of electrical devices has developed extremely rapidly. With the rapid development of electronic information technology, the research on piezoelectric ceramic materials and their applications is also deepening, and now the requirements for miniaturization, functionalization, low cost and high stability of electronic components are higher, which will inevitably require materials It ...

Claims

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Application Information

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IPC IPC(8): C01G33/00C04B35/495H01L41/187
Inventor 张梅郭敏王习东张慈吕海军
Owner UNIV OF SCI & TECH BEIJING
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