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Pressure-sensitive material and preparation method thereof

A technology of pressure-sensitive materials and ball abrasives, applied in the field of pressure-sensitive materials and their preparation, can solve the problems of reducing sintering temperature, high sintering temperature, and reducing leakage current, so as to save energy, improve pressure-sensitive characteristics, and reduce leakage current. Effect

Active Publication Date: 2011-08-31
GUANGXI NEW FUTURE INFORMATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-temperature sintered CaCu 3 Ti 4 o 12 Base pressure-sensitive material and preparation method thereof, make CuO-Bi by ball milling 2 o 3 -B 2 o 3 The glass is evenly distributed in the grain boundary, and liquid phase mass transfer occurs during the sintering process, thereby reducing the sintering temperature; CuO-Bi 2 o 3 -B 2 o 3 At the same time, the glass improves the characteristics of the grain boundary and achieves the purpose of reducing the leakage current

Method used

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  • Pressure-sensitive material and preparation method thereof
  • Pressure-sensitive material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 1. Choose CaCu whose quality is more than 98% 3 Ti 4 o 12 Powder and mass are more than 98% CuO-Bi 2 o 3 -B 2 o 3 Glass powder, CuO-Bi 2 o 3 -B 2 o 3 Glass powder added to CaCu 3 Ti 4 o 12 In powder, CuO-Bi 2 o 3 -B 2 o 3 The amount of glass powder added is CaCu 3 Ti 4 o 12 17% of powder mass.

[0019] 2. Put the prepared materials in step (1) into a ball mill and mix them evenly to obtain a ball mill.

[0020] 3. Add the ball mill, deionized water, polyacrylic acid ammonia dispersant and polyvinyl alcohol binder into the ball mill and mix again, of which: the amount of deionized water, polyacrylic acid ammonia dispersant and polyvinyl alcohol binder They are 17%, 1.2%, and 6% of the mass of the ball abrasive, and they are required to be mixed evenly; airflow spray granulation is used to obtain powder particles with a particle diameter of 0.001 to 1 mm.

[0021] 4. Put the powder particles obtained in step (3) into a press and press into a ceramic g...

Embodiment 2

[0026] 1. Choose CaCu whose quality is more than 98% 3 Ti 4 o 12 Powder and mass are more than 98% CuO-Bi 2 o 3 -B 2 o 3 Glass powder, CuO-Bi 2 o 3 -B 2 o 3 Glass powder added to CaCu 3 Ti 4 o 12 In powder, CuO-Bi 2 o 3 -B 2 o 3 The amount of glass powder added is CaCu 3 Ti 4 o 12 10% of powder mass.

[0027] 2. Put the prepared materials in step (1) into a ball mill and mix them evenly to obtain a ball mill.

[0028] 3. Add the ball mill, deionized water, polyacrylic acid ammonia dispersant and polyvinyl alcohol binder into the ball mill and mix again, of which: the amount of deionized water, polyacrylic acid ammonia dispersant and polyvinyl alcohol binder They are 40%, 3%, and 11% of the mass of the ball abrasive, and they are required to be mixed evenly; airflow spray granulation is used to obtain powder particles with a particle diameter of 0.001-1 mm.

[0029] 4. Put the powder particles obtained in step (3) into a press and press into a ceramic green...

Embodiment 3

[0034] 1. Choose CaCu whose quality is more than 98% 3 Ti 4 o 12 Powder and mass are more than 98% CuO-Bi 2 o 3 -B 2 o 3 Glass powder, CuO-Bi 2 o 3 -B 2 o 3 Glass powder added to CaCu 3 Ti 4 o 12 In powder, CuO-Bi 2 o 3 -B 2 o 3 The amount of glass powder added is CaCu 3 Ti 4 o 12 1% of powder mass.

[0035] 2. Put the prepared materials in step (1) into a ball mill and mix them evenly to obtain a ball mill.

[0036] 3. Add the ball mill, deionized water, polyacrylic acid ammonia dispersant and polyvinyl alcohol binder into the ball mill and mix again, of which: the amount of deionized water, polyacrylic acid ammonia dispersant and polyvinyl alcohol binder They are 15%, 0.2%, and 5% of the mass of the ball abrasive respectively, and they are required to be mixed evenly; airflow spray granulation is used to obtain powder particles with a particle diameter of 0.001-1 mm.

[0037] 4. Put the powder particles obtained in step (3) into a press and press into a ...

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Abstract

The invention discloses a pressure-sensitive material and a preparation method thereof. The preparation method comprises the following steps of: adding CuO-Bi2O3-B2O3 glass powder into CaCu3Ti4O12 powder in an amount of 0.1-17 percent by mass of the CaCu3Ti4O12; and performing ball milling, pelletizing, molding, binder removal and high-temperature sintering to obtain the CaCu3Ti4O12-based pressure-sensitive material modified by CuO-Bi2O3-B2O3 glass with favorable pressure sensitive characteristic. The CuO-Bi2O3-B2O3 glass powder is introduced onto a crystal boundary, so that the microscopic appearance of the CaCu3Ti4O12-based pressure-sensitive material can be controlled, the electrical property of the crystal boundary is improved, the leakage current of the material is reduced, and the pressure sensitive characteristic of the material is enhanced. On the other hand, the sintering of CaCu3Ti4O12 can be accelerated with the low-melting-point CuO-Bi2O3-B2O3 glass, so that the CaCu3Ti4O12 can be densified at lower temperature, and energy is saved.

Description

technical field [0001] The invention belongs to the technical field of material preparation. Specifically, it is a pressure-sensitive material and a preparation method thereof. Background technique [0002] Varistors can be used in electrical and electronic circuits to absorb abnormal overvoltage and protect various components in the circuit or various instruments and equipment used on the circuit. Traditional pressure-sensitive materials mainly focus on zinc oxide-based materials. In recent years, due to the CaCu 3 Ti 4 o 12 It has received extensive attention due to its ultra-high dielectric constant and good dielectric temperature stability. There is a Schottky barrier in the grain boundary of this material, which can prevent the passage of electric current, so that CaCu 3 Ti 4 o 12 Has good current-voltage characteristics. CaCu 3 Ti 4 o 12 The nonlinear coefficient can reach 912 in the range of 5-100 mA [Chung, S.Y., Kim, I.D.and Kang, S.J.L., Strong nonlinea...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/63C04B35/622
Inventor 常宝成刘来君徐伟覃远东蔡燕秋梁自伟
Owner GUANGXI NEW FUTURE INFORMATION IND
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