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A kind of piezoelectric ceramic and preparation method thereof

A piezoelectric ceramic and solution technology, applied in the field of piezoelectric ceramic materials, can solve the problems of lead-free piezoelectric ceramics performance gap, unachieved and other problems

Active Publication Date: 2020-09-18
XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with lead-based piezoelectric ceramics, there is still a big gap in the performance of lead-free piezoelectric ceramics, which is far from reaching the level of replacing lead-based piezoelectric ceramics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A piezoelectric ceramic comprising the following steps: (1) dissolving ferric nitrate nonahydrate, sodium nitrate hexahydrate, and citric acid in deionized water at a weight ratio of 80:35:75, and then adding the nitrate solution to the citric acid In the solution, adjust the pH of the solution at 5 so that the concentration of the solution is 0.8mol / L. When the solution is stirred to a uniform and transparent solution, evaporate and dehydrate at 80°C to gel, then dry at 90°C and then grind. Then gradually heat treatment at 750-950°C with a heating rate of 25°C / h to obtain nano-NiFe 2 o 4 ; (2) with Na 2 CO 3 、K 2 CO 3 , Nb 2 o 5 、 Bi 2 o 3 、 Ta 2 o 5 、NiFe 2 o 4 、WO 3 、Na 2 B 4 o 7 , carbon nanotubes as raw materials, and then put the prepared raw materials in a ball milling tank, and add absolute ethanol as a ball milling medium. After ball milling in a planetary ball mill for 16 hours, treat it in an oven at 55°C for 20 hours; (3) use 140 After the t...

Embodiment 2

[0020] A piezoelectric ceramic, comprising the following steps: (1) dissolving ferric nitrate nonahydrate, sodium nitrate hexahydrate, and citric acid in deionized water at a weight ratio of 80:40:75, and then adding the nitrate solution to the citric acid In the solution, adjust the pH of the solution at 5 so that the concentration of the solution is 0.8mol / L. When the solution is stirred to a uniform and transparent solution, evaporate and dehydrate at 70°C to gel, then dry at 100°C and then grind. Then gradually heat treatment at 750-950°C with a heating rate of 25°C / h to obtain nano-NiFe 2 o 4 ; (2) with Na 2 CO 3 、K 2 CO 3 , Nb 2 o 5 、 Bi 2 o 3 、 Ta 2 o 5 、NiFe 2 o 4 、WO 3 、Na 2 B 4 o 7 , carbon nanotubes as raw materials, and then put the prepared raw materials in a ball milling tank, and add absolute ethanol as a ball milling medium, after ball milling in a planetary ball mill for 16 hours, treat it in an oven at 55°C for 20 hours; (3) use 180 After the...

Embodiment 3

[0022] A piezoelectric ceramic, comprising the following steps: (1) dissolving ferric nitrate nonahydrate, sodium nitrate hexahydrate, and citric acid in deionized water at a weight ratio of 80:36:75, and then adding the nitrate solution to the citric acid In the solution, adjust the pH of the solution at 5 so that the concentration of the solution is 0.8mol / L. When the solution is stirred to a uniform and transparent solution, evaporate and dehydrate to gel at 72°C, then dry at 95°C and then grind. Then gradually heat treatment at 750-950°C with a heating rate of 25°C / h to obtain nano-NiFe 2 o 4; (2) with Na 2 CO 3 、K 2 CO 3 , Nb 2 o 5 、 Bi 2 o 3 、 Ta 2 o 5 、NiFe 2 o 4 、WO 3 、Na 2 B 4 o 7 , carbon nanotubes as raw materials, and then put the prepared raw materials in a ball milling tank, and add absolute ethanol as a ball milling medium, after ball milling in a planetary ball mill for 16 hours, treat it in an oven at 55°C for 20 hours; (3) use 150 After the t...

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Abstract

The invention provides piezoelectric ceramic and a preparation method thereof. The preparation method comprises the following steps: preparing nanometer NiFe2O4; (2) ball-milling the raw materials comprising Na2CO2, K2CO3, Nb2o5, Bi2O3, Ta2O5, NiFe2O4, WO3, Na2B4O7 and carbon nano-tubes by taking absolute ethanol as a ball-milling medium, and drying; (3) pre-sintering the above raw materials, ball-milling the pre-sintered raw materials by using absolute ethanol, and drying; (4) putting the dried mixed materials into a sintering furnace, pre-sintering, adding Ag2O, ball-milling for the second time by taking absolute ethanol as a medium, drying, pelletizing by using paraffin, performing glue discharging treatment, and sintering at high temperature for 3 hours to prepare ceramic; and (5) polishing the surface of the sintered ceramic, plating a silver electrode, putting into silicone oil and polarization. The piezoelectric ceramic is a piezoelectric ceramic material with excellent performance and high mechanical quality factor.

Description

technical field [0001] The invention relates to the field of piezoelectric ceramic materials, in particular to a piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramic material is a functional ceramic material that can convert mechanical energy and electrical energy. When subjected to mechanical pressure or sensing vibration signals, there will be a voltage signal output between the two electrode surfaces of piezoelectric ceramics; When an electrical signal is applied to a piezoelectric ceramic, it can also convert the electrical signal into a vibration signal. Using these two characteristics (forward and reverse piezoelectric effects), many components with special functions can be designed, such as piezoelectric frequency devices, transmitting and receiving ultrasonic devices, measurement and control devices, signal generators (electrical and acoustic signals) ), high voltage power generator. With the continuous researc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622C04B41/88C04B41/80
Inventor 樊之雄
Owner XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD