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A low-temperature sintered zinc oxide varistor ceramic and its preparation method

A technology of varistor ceramics and low-temperature sintering, which is applied in the field of low-temperature sintered zinc oxide varistor ceramics and its preparation. It can solve the problems of high sintering temperature and reaction, achieve stable chemical properties, promote sintering, and increase the potential gradient.

Active Publication Date: 2021-07-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low-temperature sintered zinc oxide varistor ceramic and other problems in the preparation technology of the existing multi-layer chip varistor ceramics, such as excessive sintering temperature and reaction during co-firing of the inner electrode and the ceramic layer. its preparation method

Method used

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  • A low-temperature sintered zinc oxide varistor ceramic and its preparation method
  • A low-temperature sintered zinc oxide varistor ceramic and its preparation method
  • A low-temperature sintered zinc oxide varistor ceramic and its preparation method

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Embodiment 1-4

[0033] A method for preparing low-temperature sintered zinc oxide varistor ceramics, specifically comprising the following steps:

[0034] (1) Mix zinc oxide, sintering aids and modification additives according to the proportions described in Table 1, put the mixed powder into a ball mill tank, mix it with deionized water, and ball mill it in a vertical planetary ball mill for 40 Minutes, the ratio of the powder, balls and water is 1.5:1:1. After the ball milling, put the uniformly mixed slurry in an oven to dry to obtain a dry and uniform powder.

[0035] (2) Add PVA glue (polyvinyl alcohol solution) to the powder obtained, the addition is 10wt% of ZnO, granulate and sieve, press and form, wherein the mold is a cylindrical mold with a diameter of about 14mm, and the pressure is 80MPa, pressurized The time is 3-5 seconds, and then the obtained ceramic green sheet is subjected to debinding treatment in a box furnace at a debinding temperature of 600° C., kept for 1 hour and the...

Embodiment 5

[0045] A method for preparing low-temperature sintered zinc oxide varistor ceramics, specifically comprising the following steps:

[0046] (1) Mix zinc oxide, sintering aids and modifying additives in the following proportions: ZnO and Bi 2 o 3 , Sb 2 o 3 、Co 3 o 4 , Mn 3 o 4 、Ni 2 o 3 The molar percentage is (97.3): (1): (1): (0.3): (0.2): (0.2); Cr 2 o 3 , Al(NO 3 ) 9H 2 O, SiO 2 , B 4 The mass ratio of C and ZnO is (0.2):(0.0125):(0.5):(0.5):(100). After mixing, mix with deionized water and ball mill in a vertical planetary ball mill for 40 minutes. The ratio of the powder, balls and water is 1.5:1:1. After the ball milling, put the uniformly mixed slurry in an oven Dried to get a dry and uniform powder.

[0047] (2) Add PVA glue (polyvinyl alcohol solution) to the powder obtained, the addition is 10wt% of ZnO, granulate and sieve, press and form, wherein the mold is a cylindrical mold with a diameter of about 14mm, and the pressure is 80MPa, pressurized Th...

Embodiment 6

[0052] A method for preparing low-temperature sintered zinc oxide varistor ceramics, specifically comprising the following steps:

[0053] (1) Mix zinc oxide, sintering aids and modifying additives in the following proportions: ZnO and Bi 2 o 3 , Sb 2 o 3 、Co 3 o 4 , MnO 2 、Ni 2 o 3 The molar percentage is (96.9): (1): (1): (0.3): (0.6): (0.2); Cr 2 o 3 , Al(NO 3 ) 9H 2 O, SiO 2 , B 4 The mass ratio of C and ZnO is (0.2):(0.0125):(0.5):(0.5):(100). After mixing, mix with deionized water and ball mill in a vertical planetary ball mill for 40 minutes. The ratio of the powder, balls and water is 1.5:1:1. After the ball milling, put the uniformly mixed slurry in an oven Dried to get a dry and uniform powder.

[0054] (2) Add PVA glue (polyvinyl alcohol solution) to the powder obtained, the addition is 10wt% of ZnO, granulate and sieve, press and form, wherein the mold is a cylindrical mold with a diameter of about 14mm, and the pressure is 80MPa, pressurized The ti...

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Abstract

The invention discloses a low-temperature sintered zinc oxide varistor ceramic and a preparation method thereof. Zinc oxide, sintering aid B 4 C and modified additives are mixed and ball milled to obtain powder after drying; modified additives contain Bi 2 o 3 , Sb 2 o 3 、Co 3 o 4 , manganese oxide and Ni 2 o 3 ; Add PVA glue to the obtained powder, granulate and sieve, press and deglue; sinter at 900-950°C for 2-3h to obtain a black and dense pressure-sensitive ceramic sheet; then coat both sides of the pressure-sensitive ceramic sheet with silver The slurry is heated to 500°C-550°C, kept for 20-30 minutes and then cooled to obtain a pressure-sensitive ceramic with electrodes printed on both sides. The present invention adopts B 4 C is used as a sintering aid to reduce the sintering temperature from the traditional 1100-1200°C to below 950°C, and at the same time ensure that the varistor ceramics have good comprehensive electrical properties. Industrialization promotion.

Description

technical field [0001] The invention relates to a low-temperature sintered zinc oxide varistor ceramic and a preparation method thereof, belonging to the technical field of varistor materials. Background technique [0002] ZnO varistors are widely used in electronic circuits and power systems as voltage stabilizing and surge protection devices due to their excellent nonlinear current-voltage characteristics and high energy absorption capacity. With the development of electronic circuits toward integration and miniaturization, there is also a volume requirement for the corresponding protection components, and multilayer varistors that can be used for surface mounting greatly reduce the size of the device. [0003] Generally, the sintering temperature range of ZnO varistor ceramics is 1100-1200°C. At such a high temperature, silver-palladium alloys with high melting points are often used as internal electrodes to achieve high-temperature co-firing of internal electrodes and va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/453C04B35/622C04B41/88C04B35/64
CPCC04B35/453C04B35/622C04B35/64C04B41/009C04B41/5116C04B41/88C04B2235/3241C04B2235/3262C04B2235/3277C04B2235/3279C04B2235/3294C04B2235/3298C04B2235/3418C04B2235/3821C04B2235/443C04B2235/602C04B2235/656C04B2235/96C04B41/4535
Inventor 卢振亚肖淼淼杨凤金
Owner SOUTH CHINA UNIV OF TECH