Method for preparing textured lead zirconate titanate ceramic

A lead zirconate titanate and texturing technology, applied in the field of composite materials, can solve problems such as difficult preparation of PZT single crystal

Inactive Publication Date: 2010-12-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far it is difficult to prep...

Method used

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Embodiment 1

[0011] Embodiment 1: A method for preparing textured lead zirconate titanate ceramics according to the present invention, the steps are as follows:

[0012] Step 1: Use strontium carbonate and titanium dioxide as raw materials, mix according to the molar ratio of 3.1:2.0, heat to 1250 ° C for 3-4 hours, and generate strontium titanate intermediate Sr3Ti2O7, strontium titanate intermediate Sr3Ti2O7 and titanium dioxide by mole Mix again at a ratio of 1.0:1.1, heat to 1100°C for 2 hours, wash the sintered powder with water several times, wash the potassium chloride and dry to obtain a microscopically arranged strontium titanate template, and the prepared titanate The microstructure of the strontium template under the scanning electron microscope presents large and dispersed flakes, and the addition of strontium titanate template grains guides the ceramic grains to grow along a certain direction;

[0013] Step 2: Add PZT powder into a mixed solvent composed of absolute ethanol an...

Embodiment 2

[0016] Embodiment 2: The use of the template grain growth method in the present invention Add anisotropic particles that basically match its crystal lattice to the target material, and use an effective process to make the anisotropic particles evenly distributed and oriented in the target material, In the subsequent sintering process of the ceramic material, the anisotropic particles serve as a template to guide the growth of the ceramic material particles along the surface of the template, forming an anisotropic grain distribution. The piezoelectric performance of piezoelectric ceramics in a specific direction can be greatly improved while reducing the polarization voltage. So far, there have been no reports about the successful preparation of PZT single crystals. The present invention can easily obtain highly textured PZT ceramics, so that the piezoelectric properties in the direction can be well exerted, which will greatly improve Electrical strain or step-up ratio of a pi...

Embodiment 3

[0024] Example 3: The formula and conditions for preparing PZT-based textured piezoelectric ceramics are as follows, and the matrix material PZT powder is commercially available.

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Abstract

The invention discloses a method for preparing textured lead zirconate titanate ceramic, namely a method for preparing highly textured PZT piezoelectric ceramic with a (001) direction. The method for preparing the textured lead zirconate titanate ceramic comprises the following steps of: preparing a strontium titanate template with a laminated microstructure from strontium carbonate and titanium dioxide serving as raw materials by using a two-step molten salt method; adding the template into PZT powder, casting, tabletting and sintering to prepare a PZT block material with higher texturing, piezoelectric coefficient and electromechanical coupling coefficient; and adding the strontium titanate template in microscopic directed arrangement into the PZT ceramic, making the template have directivity in the PZT ceramic by using a casting method, and making the PZT ceramic grow directionally along the template direction to have a highly textured structure similar to a single-crystal structure. The piezoelectric ceramic has higher orientation degree, and has the piezoelectric property greatly improved in the aspects such as piezoelectric constant, piezoelectric coupling coefficient and the like compared with the common PZT.

Description

(1) Technical field [0001] The invention relates to composite material technology, specifically a method for preparing textured lead zirconate titanate ceramics. (2) Background technology [0002] For lead zirconate titanate (PZT), its single crystal has the highest piezoelectric properties. But so far it is difficult to prepare a large number of PZT single crystals. PZT with <001> texture has properties similar to single crystals. PZT piezoelectric ceramics with a highly textured <001> direction can be prepared by the template grain growth method. The template grain growth method is to make the piezoelectric ceramics oriented along the direction of the template by adding a directional template to the piezoelectric ceramics. growth, thus achieving a highly textured approach. This method has been applied in the preparation of lead magnesium niobate titanate (PMN-PT) series piezoelectric ceramics, and the piezoelectric performance has been greatly improved, whic...

Claims

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Application Information

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IPC IPC(8): C04B35/491C04B35/622
Inventor 邱琳张磊闫润泽张明福
Owner HARBIN INST OF TECH
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