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Preparation method of rare earth modified pressure-sensitive material

A pressure-sensitive material, rare earth modification technology, applied in the field of preparation of CaCu3Ti4O12-based pressure-sensitive materials, can solve problems such as poor performance and large leakage current, and achieve the effect of improving pressure-sensitive characteristics and reducing leakage current

Active Publication Date: 2011-09-07
XINING GONGJIN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the CaCu in the prior art 3 Ti 4 o 12 To solve the problems of poor varistor performance and large leakage current, the present invention provides a rare earth grain boundary modified CaCu 3 Ti 4 o 12 The preparation method of the base pressure-sensitive material, through the uniform distribution of rare earth in the grain boundary, regulates the microstructure of the material, so as to reduce the leakage current and improve the pressure-sensitive performance

Method used

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  • Preparation method of rare earth modified pressure-sensitive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] CaCu 3 Ti 4 o 12 The powder is sieved, and lanthanum oxide is added, and the total mass added is CaCu 3 Ti 4 o 12 0.01% of the powder mass; put the prepared material into a ball mill for mixing, the ball / material mass ratio is 9, and the material of the ball is zirconia. Add deionized water with a mass ratio of 23% of raw materials, polyacrylic acid ammonia dispersant with a mass ratio of 1.5%, and polyvinyl alcohol binder with a mass ratio of 6%, and mix them uniformly for 2 hours to form a slurry with a ball milling speed of 200 revolutions per minute, using airflow spray granulation to obtain powder particles with an average particle diameter of 0.3 mm; put the prepared powder particles into a press, and press a disc under a pressure of 300 MPa; put the disc into the furnace For medium debinding, the heating rate is 45°C / h at 25-500°C, 180°C / h at 500-800°C, and kept at 270°C, 360°C, 500°C and 800°C for 1 hour, and then cooled with the furnace ;Put the obtained ...

Embodiment 2

[0018] CaCu 3 Ti 4 o 12 The powder is sieved, adding lanthanum oxide and europium oxide, the mass ratio is 1:1, and the total mass added is CaCu 3 Ti 4 o 12 3% of the mass of the powder; put the prepared material into a ball mill for mixing, the ball / material mass ratio is 8, and the material of the ball is zirconia. Add deionized water with a mass ratio of 20% of raw materials, polyacrylic acid ammonia dispersant with a mass ratio of 1.8%, and polyvinyl alcohol binder with a mass ratio of 8%, and mix them uniformly for 2 hours to form a slurry with a ball milling speed of 200 revolutions per minute, using airflow spray granulation to obtain powder particles with an average particle diameter of 0.1mm; put the prepared powder particles into a press, and press the discs under a pressure of 300MPa; put the discs into the furnace For medium debinding, the heating rate is 45°C / h at 25-500°C, 180°C / h at 500-800°C, and kept at 270°C, 360°C, 500°C and 800°C for 1 hour, and then c...

Embodiment 3

[0020] CaCu 3 Ti 4 o 12 The powder is sieved, and praseodymium oxide is added, and the total mass added is CaCu 3 Ti 4 o 12 9% of the mass of the powder; the prepared material is put into a ball mill for mixing, the ball / material mass ratio is 12, and the material of the ball is agate. Add deionized water with a mass ratio of 30% of the raw materials, a polyacrylic acid ammonia dispersant with a mass ratio of 2.8%, and a polyvinyl alcohol binder with a mass ratio of 10%, and mix them uniformly for 3 hours to form a slurry with a ball milling speed of 300 Turn per minute, use airflow spray granulation to obtain powder particles with an average particle diameter of 0.03 mm; put the prepared powder particles into a press, and press the disc under a pressure of 400MPa; put the disc into the furnace For medium debinding, the heating rate is 35°C / h at 25-500°C, 130°C / h at 500-800°C, and kept at 270°C, 360°C, 500°C and 800°C for 2 hours, then cooled with the furnace ;Put the re...

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Abstract

The invention discloses a preparation method of a rare earth modified pressure-sensitive material. The preparation method comprises the following steps: adding one or a combination of lanthanide series rare earth oxides in CaCu3Ti4O12 powder, wherein the total mass of added rare earth oxides is 0.01-9% of the mass of CaCu3Ti4O12 powder, and the lanthanide series rare earth metal oxides comprise lanthanum oxide, cerium oxide, praseodymium oxide, neodymium oxide, promethium oxide, samarium oxide, europium oxide, gadolinium oxide, terbium oxide, antimony oxide, holimium oxide, erbium oxide, thulium oxide, ytterbium oxide and lutetium oxide; and the rare earth modified CaCu3Ti4O12-based ceramic with good pressure-sensitive characteristic can be prepared by the process steps of ball milling, pelleting, forming, dewaxing, and high-temperature sintering. In the preparation method, since rare earth oxides are introduced to a crystal boundary, on one hand, the microscopy topography of the CaCu3Ti4O12-based pressure-sensitive material is regulated, and on the other hand, the electric property of the crystal boundary of the CaCu3Ti4O12-based pressure-sensitive material is changed, thereby reducing the leakage current of the material and improving the pressure-sensitive characteristic of the material so that the pressure-sensitive material reaches commercial requirements.

Description

technical field [0001] The invention relates to a rare earth modified CaCu 3 Ti 4 o 12 The invention discloses a method for preparing a (CCTO)-based pressure-sensitive material, belonging to the technical field of material preparation. 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. Increasing the dielectric constant of the varistor sheet can significantly improve the uniformity of the potential distribution of the varistor column in the arrester. At present, ZnO varistors fired by adding rare earth oxides, transition metal oxides, etc. are used. The relative dielectric constant of the material is relatively low. The stray capacitance is in the same order of magnitude, causing the potential distribution of the varistor column in the arrester to be very uneven. The uneven potential distribution wi...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/622
Inventor 刘来君黄延民苏聪学方亮胡长征
Owner XINING GONGJIN NEW MATERIAL TECH CO LTD
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