Preparation method of light curing molding potassium-sodium niobate leadless piezoelectric ceramics

A technology of light-curing molding and potassium sodium niobate, which is applied in the field of piezoelectric ceramics, can solve problems such as inability to realize complex structures, complex processing techniques, and damage, and achieve excellent electrical properties, low viscosity, and high light activity.

Inactive Publication Date: 2019-04-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional piezoelectric ceramic molding techniques include dry press molding, tape casting, and grouting molding, etc., which can realize piezoelectric devices with simple shapes, but inevitably have the disadvantages of complex processing technology and inability to realize complex structures.
Piezoelectric ceramics are hard and brittle, and are easy to be damaged during the molding process.

Method used

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  • Preparation method of light curing molding potassium-sodium niobate leadless piezoelectric ceramics
  • Preparation method of light curing molding potassium-sodium niobate leadless piezoelectric ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preliminary chemical formula is K 0.46 Na 0.5 Li 0.04 Nb 0.95 Sb 0.05 o 3 Potassium sodium niobate series lead-free piezoelectric ceramic powder, the powder can be purchased from the market or can be obtained according to the preparation methods well known to those skilled in the art, and can also be prepared by the following method: According to chemical formula K 0.46 Na 0.5 Li 0.04 Nb 0.95 Sb 0.05 o 3 The atomic ratio of each element in the formula, weigh a certain mass of K 2 CO 3 、Na 3 CO 3 , Nb 2 o 5 , Li 2 CO 3 and Sb 2 o 3Pour the raw materials into the ball mill jar respectively, add the grinding medium absolute ethanol and zirconia grinding balls, wet the mixture at 250rpm for 24 hours, dry the intermediate to obtain the intermediate, and pre-calcine the intermediate at 900°C for 4 hours , and crushed with a mortar to obtain 0.46 Na 0.5 Li 0.04 Nb 0.95 Sb 0.05 o 3 Potassium sodium niobate based lead-free piezoelectric ceramic powder wi...

Embodiment 2

[0043] Preliminary chemical formula is K 0.46 Na 0.5 Li 0.04 Nb 0.95 Sb 0.05 o 3 Potassium sodium niobate-based lead-free piezoelectric ceramic powder, which can be purchased from the market or can be obtained according to a preparation method well known to those skilled in the art, or can be prepared by the method described in Example 1.

[0044] Weigh a certain mass of potassium sodium niobate lead-free piezoelectric ceramic powder, and weigh a surfactant whose mass is 1% of the mass of the ceramic powder, pour it into a ball mill jar, add grinding media absolute ethanol and zirconia Grinding balls, the mixture was ball milled at 350 rpm for 12 hours. This process not only breaks the ceramic particles to reduce the particle size of the powder, but also makes the surface active agent evenly adhere to the surface of the ceramic powder, so that the sodium potassium niobate series lead-free piezoelectric ceramic powder is modified. In this embodiment, polyethylene glycol o...

Embodiment 3

[0055] Preliminary chemical formula is K 0.46 Na 0.5 Li 0.04 Nb 0.95 Sb 0.05 o 3 Potassium sodium niobate-based lead-free piezoelectric ceramic powder, which can be purchased from the market or can be obtained according to a preparation method well known to those skilled in the art, or can be prepared by the method described in Example 1.

[0056] Weigh a certain mass of potassium sodium niobate lead-free piezoelectric ceramic powder, and weigh a surfactant whose mass is 1% of the mass of the ceramic powder, pour it into a ball mill jar, add grinding media absolute ethanol and zirconia Grinding balls, the mixture was ball milled at 350 rpm for 12 hours. This process not only breaks the ceramic particles to reduce the particle size of the powder, but also makes the surface active agent evenly adhere to the surface of the ceramic powder, so that the sodium potassium niobate series lead-free piezoelectric ceramic powder is modified. In this embodiment, polyethylene glycol o...

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Abstract

The invention discloses a preparation method of light curing molding potassium-sodium niobate leadless piezoelectric ceramics. The method comprises the following steps that potassium-sodium niobate leadless piezoelectric ceramic powder is modified, and finally activated piezoelectric ceramic fine powder with the excellent performance is obtained; then, the activated ceramic fine powder is mixed with a photo initiator, acrylic resin, a dispersing agent and a defoaming agent through ball milling, and vacuumizing is performed to obtain uniform-dispersed leadless piezoelectric ceramic slurry withproper viscosity and high photo-curing activity; then, the prepared ceramic slurry is subjected to photo-curing molding through a 3D printer, and a ceramic green body is obtained; finally, the ceramicgreen body is subjected to two-step degreasing, sintering, silver coating and polarization to obtain dense flawless potassium-sodium niobate leadless piezoelectric ceramics. The obtained ceramic slurry is uniform in granule dispersion, high in illumination activity, low in viscosity and capable of printing complex components of any shape in the photo-curing process, the sintered sample is high indensity and excellent in electric performance, and the using requirement of a piezoelectric device is met.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric ceramics, in particular to a method for preparing lead-free piezoelectric ceramics based on potassium sodium niobate formed by photocuring. Background technique [0002] Piezoelectric ceramics are functional ceramic materials that can convert electrical energy to mechanical energy. Due to its good piezoelectric properties, dielectric properties and elastic properties, it is widely used in sensing, actuation, energy conversion, biomedical imaging and therapy, and other fields. Lead zirconate titanate piezoelectric ceramics are currently the most widely used piezoelectric materials due to their excellent piezoelectric properties, good temperature and time stability, and high Curie temperature. However, since lead zirconate titanate piezoelectric ceramics contain lead, its preparation and use will cause harm to the human body and the environment. With the increasing emphasis on environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/626C04B35/634C04B41/88B33Y10/00B33Y70/00B28B11/24
CPCB28B11/243B33Y10/00B33Y70/00C04B35/495C04B35/622C04B35/62615C04B35/6264C04B35/63424C04B41/5116C04B41/88C04B2235/3201C04B2235/3203C04B2235/3251C04B2235/3294C04B2235/60
Inventor 吴大伟陈韦岑严康张园豪何丽媛刘威米源
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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