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Method for preparing bending-free piezoelectric ceramic fiber with low cost

A piezoelectric ceramic, non-bending technology, applied in the field of ultrasonic imaging and non-destructive flaw detection, can solve the problems of high cost, inability to prepare, consume large carbon fibers, etc., and achieve good piezoelectric performance, good uniformity, and low porosity.

Active Publication Date: 2010-09-01
江苏为一新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method needs to consume a large amount of valuable carbon fibers, and the cost is very high; the obtained PZT fibers have poor compactness, and most of them are irregular tubular
The piezoelectric properties of composites prepared with it are also poor
[0007] In addition, the bending of the fibers affects the orientation of the fibers, which also reduces the density of the fiber arrangement and the volume density and uniformity of the fibers in the composite.
However, none of the above methods can prepare long non-bending PZT-based piezoelectric ceramic fibers.

Method used

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  • Method for preparing bending-free piezoelectric ceramic fiber with low cost
  • Method for preparing bending-free piezoelectric ceramic fiber with low cost
  • Method for preparing bending-free piezoelectric ceramic fiber with low cost

Examples

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example 1

[0039] Using analytically pure lead oxide, titanium dioxide, zirconium dioxide, lanthanum trioxide, niobium pentoxide and bismuth trioxide as raw materials, the traditional mixed oxide sintering process was adopted, and the materials were mixed and pre-sintered at 850 °C for 3 hours. After crushing, the powder and zirconia balls (diameter of 2mm, mass ratio of 3mm and 8mm are 8:5:3) were put into a nylon ball mill in a mass ratio of 1:4, and milled with water as the medium for 6 hours. Preparation of lead lanthanum zirconate titanate [Pb 1-1.5x La x (Zr 0.58 Ti 0.42 ) 1-1.25y Nb y O 3 +0.01weight%Bi 2 O 3 (x=0.06, y=0.02); PLZT] powder particle size analysis by laser particle size analyzer (LS908A, Zhuhai Omega) and scanning electron microscope (JEOL, JSM-6490) showed that the most particle size The diameter is about 0.72 μm. The polyvinyl alcohol and water were put into a beaker at a ratio of 8:92, and were dissolved at 80° C. for more than 8 hours under stirring to ...

example 2

[0045] The commercial product PZT502 standard raw material powder and zirconia beads (diameter 2mm, 3mm and 8mm mass ratio of 8:5:3) were put into a nylon ball mill in a mass ratio of 1:4, and milled for 6 hours with water as the medium. The particle size analysis of the powder by laser particle size analyzer (LS908A, Zhuhai Omega) and scanning electron microscope (JEOL, JSM-6490) shows that the most probable particle size is about 0.52 μm. Put polyvinyl alcohol, polyvinylpyrrolidone and water in a beaker at a ratio of 10:8:82, and dissolve at 80° C. for more than 8 hours under stirring to obtain a viscous binder aqueous solution.

[0046] Mix PZT502 and binder aqueous solution at a ratio of 70:30, stir well and -3 Degassed for 30 minutes under Pa pressure to become a mud billet. The plastic sludge is loaded into the barrel of the spinning machine, heated to 55-60°C, and extruded through a spinneret hole with a diameter of 350 microns to form a fiber blank. The fiber blank w...

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Abstract

The invention discloses a method for preparing a bending-free piezoelectric ceramic fiber with a low cost. The method comprises the following steps of: fully and uniformly stirring one or two of polyvinyl alcohol, polyvinyl pyrrolidone and cellulose acetate serving as adhesives, water serving as a solvent and lead zirconate titanate series powder with a grain diameter of smaller than 1 micron serving as a raw material, degassing the mixture under the negative pressure of between 10<-2> and 10<-3> Pa or degassing the mixture in a vacuum pugmill to form a briquette; putting the briquette into a melt spinning machine for spinning, straightening the spun briquette and drying the straightened briquette in the air to form a continuous fiber, and cutting the continuous fiber into short fiber briquettes with lengths of between 100 and 350 millimeters; pyrolyzing the fiber briquettes in a muffle furnace at the temperature of 550 DEG C for 1 hour, raising the temperature to 85 to 900 DEG C at a speed of 5 DEG C per minute, preserving the heat for 2 hours and cooling the fiber briquettes; and hanging pre-burnt fiber briquettes in an aperture formed between two square corundum strips in a corundum crucible, raising the temperature to a needed temperature at the speed of 5 DEG C per minute and preserving the heat for about 90 minutes to obtain the ceramic fiber. The method has low cost; the prepared ceramic fiber is bending-free; and the sintered ceramic fiber has low porosity, good uniformity and good piezoelectric property.

Description

technical field [0001] The invention relates to functional materials used in ultrasonic transducers, in particular to a low-cost preparation method for producing non-bending piezoelectric ceramic fibers, which is applied to the technical fields of ultrasonic imaging and non-destructive testing. Background technique [0002] Ultrasound imaging and NDT have a wide range of uses in the medical and military fields. Generally, functional materials used in ultrasonic transducers are piezoelectric ceramics, piezoelectric crystals, magnetostrictive materials and piezoelectric polymers. Piezoelectric ceramics and piezoelectric crystals have high energy conversion efficiency, but their brittleness makes the machining of thin vibrators more difficult, and the manufacturing cost of single crystals is dozens or even hundreds of times that of ceramics. The mutual coupling between the radial vibration and the thickness vibration is the main source of noise in the ultrasonic imaging proces...

Claims

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Application Information

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IPC IPC(8): C04B35/491C04B35/622
Inventor 李坤严玲韩权威周金龙李金华
Owner 江苏为一新材料科技有限公司
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