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Preparation method of piezoelectric ceramic spherical shell

A piezoelectric ceramic and spherical shell technology, which is applied in the field of piezoelectric ceramic spherical shell preparation, can solve the problems of restricting the omnidirectional underwater acoustic transducer, high preparation cost, unstable performance, etc., and achieves strong universality of powder. , The effect of short production cycle and high production efficiency

Inactive Publication Date: 2012-10-31
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the hard and brittle characteristics of ceramics and the characteristics of high-temperature sintering required in the manufacturing process, coupled with the extremely special shape of such hollow spherical shell parts with small openings and large internal cavities, its preparation is extremely difficult.
Conventional methods require the use of complex and huge isostatic pressing equipment and complex ceramic sintering procedures to remove the lost foam of the metal balls in the hollow shell, or the need to butt two hemispherical shell ceramic bodies, which leads to extremely high preparation costs. The yield is low and the performance is unstable; in addition, for ceramic spherical shells with relatively large sizes (such as diameters exceeding 10cm), conventional methods are difficult to prepare, which seriously restricts the manufacture of omni-directional underwater acoustic transducers

Method used

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  • Preparation method of piezoelectric ceramic spherical shell
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Examples

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Embodiment 1

[0027] Mix 4g of acrylamide (AM), 1g of N,N'-methylenebisacrylamide (MBAM), 65g of lead zirconate titanate powder and 1g of dispersant ammonium citrate with 10g of deionized water to obtain a volume fraction of about It is about 19ml of 45Vol% low-viscosity ceramic slurry. After vacuuming and defoaming, add 2μg initiator and 10ul catalyst. After stirring evenly, pour it into a metal mold with a ball cavity inner diameter of 1.2cm and a central fixed diameter of 1cm wax ball. Put it in an oven at 60°C for 1 hour to solidify the slurry, then raise the temperature to 80°C to remove the inner mold of the wax ball; after the wax ball is removed, take the formed hollow ceramic spherical shell out of the mold, and place it at 30-40°C for 72 Continue to solidify and dry for hours; then remove the thin column left at the pouring port to make a hollow ceramic spherical shell green body with a strength greater than 10Mpa; keep the hollow ceramic spherical shell green body at 550°C for 2 h...

Embodiment 2

[0029]Mix 12g of acrylamide (AM), 2.4g of N,N'-methylenebisacrylamide (MBAM), 682g of lead zirconate titanate powder and 1g of dispersant sodium polyacrylate with 80g of deionized water to obtain the volume fraction About 162ml of low-viscosity ceramic slurry of about 52Vol%, after vacuuming and defoaming, add 40μg of initiator and 130ul of catalyst, after stirring evenly, pour it into a metal mold with a ball cavity inner diameter of 10cm and a central fixed diameter of 8.8cm wax ball , put it in an oven at 60°C for 2 hours to solidify the slurry, then raise the temperature to 80°C to remove the inner mold of the wax ball; after the wax ball is removed, take the formed hollow ceramic spherical shell out of the mold, and place it at 30°C for 4 days Continue curing and drying; then remove the thin column left at the pouring port to make a hollow ceramic spherical shell green body with a strength greater than 10Mpa; keep the hollow ceramic spherical shell green body at 550°C for ...

Embodiment 3

[0031] Mix 4g methacrylamide (MAM), 1g N, N'-methylenebisacrylamide (MBAM), 190g lead zirconate titanate powder and 0.5g dispersant sodium polyacrylate with 20g deionized water to obtain About 42ml of low-viscosity ceramic slurry with a volume fraction of about 55Vol%, after vacuuming and defoaming, add 8μg initiator and 20μl catalyst. In the mold, place it in an oven at 60°C for 1.5 hours to solidify the slurry, then raise the temperature to 80°C to remove the inner mold of the wax ball; ℃ for 72 hours to continue to solidify and dry; then remove the thin column left at the pouring port to make a hollow ceramic spherical shell green body with a strength greater than 10Mpa; keep the hollow ceramic spherical shell green body at 550°C for 1 hour, and then in Sintering at 1265°C for 2.5 hours to obtain a piezoelectric ceramic spherical shell with an outer diameter of 3.12 cm, an inner diameter of 2.6 cm, and a wall thickness of 0.52 cm.

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Abstract

The invention relates to a preparation method of a piezoelectric ceramic spherical shell. The method comprises the steps that: (1) ceramic powder, a dispersant, a curing agent system, and water are sufficiently mixed, such that high-solid-content and low-viscosity ceramic slurry is obtained; (2) a wax material is heated and melted; the molten wax material is filled into a first hollow spherical mold, such that a wax solid ball is formed; (3) the wax solid ball formed in the step (2) is concentrically arranged in a second hollow spherical mold, wherein the diameter of the second hollow spherical mold is larger by 0.2-2cm than that of the wax solid ball, such that a spherical gap is formed; the ceramic slurry is filled into the spherical gap; a gel reaction is initiated, such that the ceramic slurry is solidified into a spherical shell structure; the material is heated, and the wax ball is molten and flows out; and de-molding is carried out; and (4) the hollow ceramic spherical shell blank is heated to a temperature of 550 DEG C; the temperature is maintained for 2h; the ceramic spherical shell blank is sintered, such that the piezoelectric ceramic spherical shell is prepared. The method provided by the invention is advantaged in that no additional pressure is needed, and the operation is simple and feasible.

Description

technical field [0001] The invention relates to the field of acoustic materials, in particular, the invention relates to a method for preparing a piezoelectric ceramic spherical shell. Background technique [0002] The forward and reverse piezoelectric effect of piezoelectric materials, which can convert mechanical energy and electrical energy, makes it widely used in various acoustic transducers, micro-electromechanical systems and sensors. The most widely used mainstream piezoelectric material is piezoelectric ceramics. Piezoelectric ceramics are the core working materials of various micro-electromechanical systems, acoustic transducers and sensors. Some special transducers, such as omnidirectional underwater acoustic transducers, need to use piezoelectric ceramic spherical shells as piezoelectric vibrators to emit sound waves in all directions or detect sound signals in all directions. However, due to the hard and brittle characteristics of ceramics and the fact that hi...

Claims

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Application Information

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IPC IPC(8): C04B35/622
Inventor 郭栋刘慧生赵高磊莫喜平
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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