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Preparation method of textured high-curie-point Pr2Ti2O7 ceramic

A high Curie point, textured technology, applied in the field of preparation of Pr2Ti2O7 piezoelectric ceramic materials, can solve the problems of non-dense material structure, complex operation process, long heat treatment cycle, etc., achieve complete appearance rules, broad application prospects, obvious The effect of preferential orientation of the a-axis

Active Publication Date: 2016-01-06
广东省先进陶瓷材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing heat treatment technologies such as hot forging and hot pressing all have problems such as complex operation process, long heat treatment cycle, low production efficiency, and non-dense material structure, which affect the textured Pr to a certain extent. 2 Ti 2 o 7 Piezoelectric Properties of Ceramics and Its High Temperature Application

Method used

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  • Preparation method of textured high-curie-point Pr2Ti2O7 ceramic
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  • Preparation method of textured high-curie-point Pr2Ti2O7 ceramic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, Pr with a purity of 98.5% and a particle size of 1-20 μm 2 Ti 2 o 7 The raw material powder is filled in a high-temperature graphite mold with a diameter of 15mm, and then the mold is moved into a plasma activation sintering furnace for the first plasma activation heat treatment (that is, densification sintering): first activate for 30s, and then heat up at 100°C / min Raise the temperature to 1200°C, keep it warm for 3 minutes and apply an axial pressure of 30MPa. After reaching the holding time, start to lower the temperature, remove the pressure and cool down with the furnace to obtain a Pr with a diameter of 15mm. 2 Ti 2 o 7 ceramic block.

[0028] Second, the Pr 2 Ti 2 o 7 The ceramic block is placed in the center of a high-temperature graphite mold with a diameter of 25mm, and then the mold is moved into a plasma activation sintering furnace for the second plasma activation heat treatment (i.e. texturing molding): first activate for 30s, and then at 5...

Embodiment 2

[0031] First, Pr with a purity of 98.5% and a particle size of 2 Ti 2 o 7 The raw material powder is filled in a high-temperature graphite mold with a diameter of 15mm, and then the mold is moved into a plasma activation sintering furnace for the first plasma activation heat treatment (that is, densification sintering): first activate for 10s, and then heat up at 50°C / min Raise the temperature to 1250°C, keep it warm for 1min and apply an axial pressure of 20MPa. After reaching the holding time, start to lower the temperature, remove the pressure and cool down with the furnace to obtain a Pr with a diameter of 15mm. 2 Ti 2 o 7 ceramic block.

[0032] Second, the Pr 2 Ti 2 o 7 The ceramic block is placed in the center of a high-temperature graphite mold with a diameter of 25mm, and then the mold is moved into a plasma activation sintering furnace for the second plasma activation heat treatment (i.e. texture forming): first activate for 10s, and then at 50°C / min The hea...

Embodiment 3

[0034] First, Pr with a purity of 98.5% and a particle size of 2 Ti 2 o 7 The raw material powder is filled in a high-temperature graphite mold with a diameter of 15mm, and then the mold is moved into a plasma activation sintering furnace for the first plasma activation heat treatment (that is, densification sintering): first activate for 30s, and then heat up at 100°C / min Raise the temperature to 1100°C, keep it warm for 3 minutes and apply an axial pressure of 50MPa. After reaching the holding time, start to lower the temperature, remove the pressure and cool down with the furnace to obtain a Pr with a diameter of 15mm. 2 Ti 2 o 7 ceramic block.

[0035] Second, the Pr 2 Ti 2 o 7 The ceramic block is placed in the center of a high-temperature graphite mold with a diameter of 25mm, and then the mold is moved into a plasma activation sintering furnace for the second plasma activation heat treatment (i.e. texturing molding): first activate for 30s, then at 100°C / min Th...

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Abstract

The invention relates to a preparation method of textured high-curie-point Pr2Ti2O7 ceramic. According to the technical scheme, the two-time plasma activation heat treatment technology is adopted. The method specifically includes the first step of primary plasma activation heat treatment and the second step of secondary plasma activation heat treatment. In the first step, a graphene die is filled with Pr2Ti2O7 raw materials and then moved into a plasma activated sintering furnace to be activated for 10-30 s, then the temperature is increased to 1100-1250 DEG C at the temperature rise speed of 50-100 DEG C / min, the temperature is kept for 1-3 min, pressure of 20-50 MPa is exerted, and a Pr2Ti2O7 ceramic block is obtained after dense sintering; in the second step, the Pr2Ti2O7 ceramic block is put into the center of a graphene die of a larger size and then moved into the plasma activated sintering furnace to be activated for 10-30 s, then the temperature is increased to 1200-1350 DEG C at the temperature rise speed of 50-100 DEG C / min, the temperature is kept for 3-5 min, pressure of 40-80 MPa is exerted, and the textured Pr2Ti2O7 ceramic is obtained after texturing. The defects that the existing texturing technology of hot forging, hot pressing and the like is long in thermal processing cycle, high in sintering temperature, low in production efficiency and the like are effectively overcome; the application requirement of the high-temperature piezoelectric field can be met through the prepared Pr2Ti2O7 ceramic.

Description

technical field [0001] The present invention relates to a textured, Pr 2 Ti 2 o 7 Preparation method of piezoelectric ceramic material. Background technique [0002] Piezoelectric ceramics are a class of functional materials that can realize mutual conversion of mechanical energy and electrical energy, and have been widely used in high-tech fields such as medical imaging, sensors, transducers, and ultrasonic motors. The piezoelectric application of such materials is limited by their Curie temperature, above which the piezoelectric effect will be lost due to structural phase transition. At present, for the known high-temperature piezoelectric materials (such as alkali metal niobate, tungsten bronze structure, perovskite structure and bismuth layer structure piezoelectric body, etc.), the upper limit of the application temperature is only about 700 ° C, which is difficult to meet the requirements of aviation Special fields such as aerospace, nuclear power plants, and weapo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/50C04B35/622C04B35/64
Inventor 王传彬高潇逸沈强张联盟
Owner 广东省先进陶瓷材料科技有限公司
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