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Method for preparing piezoelectric ceramic based on hot isostatic pressing process

A technology of hot isostatic pressing and piezoelectric ceramics, applied in the field of preparation of special ceramic products, can solve the problems of adverse effects of piezoelectric ceramics performance, unclean adhesive removal, change of stoichiometric ratio, etc., so as to increase the service period and use Stability, avoidance of inaccurate stoichiometry, high density effects

Pending Publication Date: 2022-01-14
中科听海(苏州)电子科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, piezoelectric ceramics are mainly prepared by the traditional sintering process, which has the following problems: 1. The density is not high, the traditional sintering process is sintered in an atmospheric pressure environment, and there are holes in the blank
2. Adhesives are not removed cleanly. In the molding process, in order to form well, polymer adhesives need to be added and mixed evenly. These adhesives need to be removed in the subsequent debinding process, but there are some problems that are not cleaned. situation, these residual adhesives will adversely affect the performance of piezoelectric ceramics
5. Lead volatilization, there is a problem of lead oxide volatilization in the firing process, and the stoichiometric ratio of the final piezoelectric ceramic product changes

Method used

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  • Method for preparing piezoelectric ceramic based on hot isostatic pressing process
  • Method for preparing piezoelectric ceramic based on hot isostatic pressing process
  • Method for preparing piezoelectric ceramic based on hot isostatic pressing process

Examples

Experimental program
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Embodiment 1

[0035] A method for preparing piezoelectric ceramics based on a hot isostatic pressing process, comprising the following steps:

[0036] Step (1) ingredients: according to Pb (Zr 0.52 Ti 0.48 )O 3 The stoichiometric ratio for batching.

[0037] Step (2) Mixing of raw materials: put the weighed raw materials in step (1) into a drum mixer for mixing, the ball milling medium is distilled water and zirconia balls, 1:2.5:2.5, ball milling for 6 hours, and the ball milling is completed The material was put into an oven and baked at 100°C to remove moisture.

[0038] Step (3) Pre-burning: add 5% pure water to the dried raw materials and mix evenly, then press the raw materials on a molding machine to form a round cake with a diameter of 100 mm and a thickness of 10 mm; put the round cake into a heating furnace, 900°C for 4 hours.

[0039] Step (4) Pulverization: smash the pre-fired billet with a hammer, then put it into a drum mixer and put 2.5 times the weight of zirconia balls...

Embodiment 2

[0057] A method for preparing piezoelectric ceramics based on a hot isostatic pressing process, comprising the following steps:

[0058] Step (1) ingredients: according to Pb 0.92 La0.08 (Zr 0.65 Ti 0.35 )O 3 Proceed to the ingredients.

[0059] Steps (2)-(10) are the same as in Example 1.

[0060] Table 3 shows the density values ​​of piezoelectric ceramics prepared by traditional sintering process and hot isostatic pressing process at different temperatures. Figure 5 The variation trend of the density of piezoelectric ceramics prepared by traditional sintering process and hot isostatic pressing process with temperature is shown. Table 4 shows the piezoelectric ceramics prepared by traditional sintering process and hot isostatic pressing process at different temperatures d 33 value. Figure 6 shows the traditional sintering process and hot isostatic pressing process to prepare piezoelectric ceramics d 33 trend with temperature. In this example, the traditional sinte...

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Abstract

The invention discloses a method for preparing piezoelectric ceramics based on a hot isostatic pressing process, which comprises the steps of weighing corresponding raw materials according to a certain stoichiometric ratio, uniformly mixing the weighed raw materials, carrying out mould pressing to form a block, carrying out presintering treatment, then crushing and sieving, filling powder into a rubber sheath, carrying out cold isostatic treatment, putting a blank formed by treatment into an iron sheath, covering an upper cover with a degassing pipe, welding the upper cover and a sheath body, degassing, sealing and welding the degassing pipe after degassing is finished, carrying out hot isostatic pressing treatment on the degassed sheath, processing an ingot blank subjected to hot isostatic pressing into a required shape, preparing a silver electrode on the surface, putting a sample into high-temperature silicone oil, applying electric field polarization. The preparation method has the beneficial effects that organic adhesive residues are avoided, the problem of inaccurate stoichiometric ratio is avoided, the product is high in density and free of pores, the piezoelectric property of the product is improved, the mechanical property of the ceramic is improved, and the service cycle and the use stability of the piezoelectric ceramic are greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of preparation of special ceramic products, in particular to a method for preparing piezoelectric ceramics based on a hot isostatic pressing process. Background technique [0002] Piezoelectric ceramics are polycrystalline ceramics with piezoelectric effect and inverse piezoelectric effect. Because of their special function of mutual conversion between mechanical energy and electrical energy, 1-3 piezoelectric composite transducers are used for underwater imaging, ultrasonic Fields (such as ultrasonic cleaning, phacoemulsification, ultrasonic welding, ultrasonic drilling, etc.), electroacoustic devices (such as pickups, speakers, receivers, buzzers, sound level calibrators, electronic calibration instruments, etc.), filters, etc. It has broad application prospects in economy and daily life. [0003] At present, piezoelectric ceramics are mainly prepared by the traditional sintering process, which has the fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/645C04B35/491C04B35/493C04B35/622C04B41/88
CPCC04B35/6455C04B35/491C04B35/493C04B35/622C04B41/009C04B41/5116C04B41/88C04B2235/3232C04B2235/3244C04B2235/3296C04B2235/3227C04B2235/5436C04B2235/602C04B2235/656C04B2235/6567C04B2235/77C04B41/4535C04B41/0072
Inventor 李群
Owner 中科听海(苏州)电子科技有限责任公司