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Low-temperature sintered zinc oxide pressure-sensitive ceramic and preparation method thereof

A low-temperature sintering technology for pressure-sensitive ceramics, applied in the field of low-temperature sintered zinc oxide pressure-sensitive ceramics and its preparation, can solve problems such as high sintering temperature and occurrence of reactions, and achieve stable chemical properties, promote sintering, and good comprehensive electrical properties

Active Publication Date: 2020-08-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Low-temperature sintered zinc oxide pressure-sensitive ceramic and preparation method thereof
  • Low-temperature sintered zinc oxide pressure-sensitive ceramic and preparation method thereof
  • Low-temperature sintered zinc oxide pressure-sensitive ceramic and preparation method thereof

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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 The...

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 tim...

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Abstract

The invention discloses low-temperature sintered zinc oxide pressure-sensitive ceramic and a preparation method thereof. The method comprises steps: mixing, ball milling, and drying zinc oxide, a sintering aid B4C and a modification additive to obtain a powder, wherein the modification additive contains Bi2O3, Sb2O3, Co3O4, an oxide of manganese and Ni2O3; adding PVA glue into the obtained powder,granulating, sieving, tabletting and discharging glue; sintering for 2 to 3h at 900 to 950 DEG C to obtain a black and compact pressure-sensitive ceramic chip; and respectively coating the two surfaces of the pressure-sensitive ceramic chip with silver paste, heating to 500-550 DEG C, carrying out heat preservation for 20-30 minutes, and cooling to obtain the pressure-sensitive ceramic with electrodes printed on the two surfaces. According to the preparation method, B4C is adopted as a sintering aid, the sintering temperature is reduced to 950 DEG C or below from traditional 1100-1200 DEG C,meanwhile, it is guaranteed that the pressure-sensitive ceramic has good comprehensive electrical properties, and the whole process is energy-saving, consumption-reducing, environmentally friendly, simple, convenient and easy to implement and capable of being industrially popularized.

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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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
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