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Preparation method of zinc oxide pressure-sensitive ceramic slurry and pressure-sensitive ceramic resistor material

A technology for pressure-sensitive ceramics and resistance materials, applied in the field of functional ceramic material manufacturing, can solve the problems of easy precipitation of slurry, uniform composition of difficult slurry, complicated process, etc., and achieve narrow particle size distribution range, uniform and stable slurry, and preparation Simple process effect

Active Publication Date: 2010-11-24
厦门ABB避雷器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the clinker process is that the process is cumbersome, it is easy to mix impurities, and the slurry is easy to precipitate
In addition, the equipment used in traditional pulping has problems such as low efficiency and uneven dispersion, such as colloid mill: its basic working principle is high-speed shearing, and shearing relies on the relative movement of two toothed surfaces, one of which rotates at a high speed , and the other is still, so that the material passing between the tooth surfaces is subject to great shearing force and friction force, so as to realize dispersion, emulsification, and homogeneity; the colloid mill can eliminate large particles (particle size greater than 10 μm) and hard agglomeration in the material It cannot be effectively crushed and dispersed; in addition, its gap is easy to wear and difficult to adjust, so it is difficult to ensure that the slurry composition is uniform within a limited time

Method used

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  • Preparation method of zinc oxide pressure-sensitive ceramic slurry and pressure-sensitive ceramic resistor material
  • Preparation method of zinc oxide pressure-sensitive ceramic slurry and pressure-sensitive ceramic resistor material
  • Preparation method of zinc oxide pressure-sensitive ceramic slurry and pressure-sensitive ceramic resistor material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh the raw materials including the following molar percentages, ZnO: 95%, Bi 2 o 3 : 0.6%, Sb 2 o 3 : 0.9%, Co 2 o 3 : 1.0%, MnCO 3 : 0.5%, Cr 2 o 3 : 0.5%, NiO: 0.5%, SiO 2 : 1.0%, of which ZnO is the main raw material, except for ZnO, other raw materials are additives.

[0035] Pour the additive in the above ratio into a stirring ball mill, add pure water whose weight is 70% of the total weight of the additive, and ball mill for 1 hour until the particle size is less than 1.5 μm.

[0036] The mixing aid is weighed, and the mixing aid includes a dispersant and an antifoaming agent, and the weight percentages of the dispersing agent and the antifoaming agent in the entire slurry system are 0.2% and 0.03%, respectively. The dispersant is composed of ammonium tetradecyl acetate and polyethylene glycol (PEG4000), and the weight ratio of the ammonium tetradecyl acetate to the polyethylene glycol (PEG4000) is 1.8:1. The foaming agent is composed of tributyl phos...

Embodiment 2

[0040] Weigh the raw materials containing the following molar percentages, ZnO: 94.5%, Bi 2 o 3 : 0.6%, Sb 2 o 3 : 1.0%, Co 2 o 3 : 1.0%, MnCO 3 : 0.6%, Cr 2 o 3 : 0.5%, NiO: 0.5%, SiO 2 : 1.3%, of which ZnO is the main raw material, except for ZnO, other materials are additives.

[0041] The mixing aid is weighed, and the mixing aid includes a dispersant and an antifoaming agent, and the weight percentages of the dispersing agent and the antifoaming agent in the entire slurry system are 0.25% and 0.04%, respectively. The dispersant is composed of ammonium tetradecyl acetate and polyethylene glycol (PEG4000), and the weight ratio of the ammonium tetradecyl acetate to the polyethylene glycol (PEG4000) is 1.9:1. The foaming agent is composed of tributyl phosphate and water-soluble silicone oil in a weight ratio of 1.7:1.

[0042] Pour the additive in the above ratio into a stirring ball mill, add pure water whose weight is 90% of the total weight of the additive, and b...

Embodiment 3

[0045] Weigh the raw materials including the following molar percentages, ZnO: 94.3%, Bi 2 o 3 : 0.7%, Sb 2 o 3 : 1.1%, Co 2 o 3 : 1.1%, MnCO 3 : 0.6%, Cr 2 o 3 : 0.6%, NiO: 0.6%, SiO 2 : 1.0%, of which ZnO is the main raw material, except for ZnO, other materials are additives.

[0046] The mixing aid is weighed, and the mixing aid includes a dispersant and an antifoaming agent, and the weight percentages of the dispersing agent and the antifoaming agent in the entire slurry system are 0.3% and 0.04%, respectively. The dispersant is composed of ammonium tetradecyl acetate and polyethylene glycol (PEG4000), and the weight ratio of the ammonium tetradecyl acetate to the polyethylene glycol (PEG4000) is 2.0:1. The foaming agent is composed of tributyl phosphate and water-soluble silicone oil in a weight ratio of 1.8:1.

[0047] Pour the additive in the above ratio into a stirring ball mill, add pure water whose weight is 80% of the total weight of the additive, and bal...

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Abstract

The invention relates to a preparation method of zinc oxide pressure-sensitive ceramic slurry and a pressure-sensitive ceramic resistor material. The preparation method comprises the following steps: weighing raw materials including main raw material ZnO and additives; adding water to proportionally prepared additives, and ball-milling for 1-4 hours; and putting the weighed ZnO, milled additives, pure water and mixing assistant into a mixing tank, quickly dispersing in a homo-mixer for 20-60 minutes, opening the valve, starting a pipeline type high-shear dispersion emulsion machine to circularly disperse for 1-3 hours, driving into a liquid storage tank, and starting a basket type mill to mill for 2-4 hours, thereby obtaining the slurry. The zinc oxide pressure-sensitive ceramic resistor material comprises the following components in percentage by mol: 93-95% of ZnO, 0.6-0.9% of Bi2O3, 0.9-1.3% of Sb2O3, 1.0-1.3% of Co2O3, 0.5-0.8% of MnCO3, 0.5-0.8% of Cr2O3, 0.5-0.8% of NiO and 1.0-1.5% of SiO2. The invention has the advantages of simple preparation procedure and high efficiency, and impurities can not be easily incorporated in the manufacturing process. The prepared slurry is even and stable and has favorable flowability.

Description

technical field [0001] The invention relates to a manufacturing technology of a functional ceramic material, in particular to a preparation method of a zinc oxide varistor ceramic slurry and a zinc oxide varistor ceramic resistance material prepared by the method. Background technique [0002] Zinc oxide varistor ceramic resistors have excellent nonlinear volt-ampere characteristics and huge energy absorption capacity, and are widely used in power and electronic systems, mainly for limiting potential and absorbing overvoltage energy. It uses zinc oxide as the main material, adds various additives such as bismuth oxide and antimony oxide, and is made according to the electronic ceramic process. [0003] At present, after decades of research and development, the performance of zinc oxide varistor ceramic resistors has been continuously improved, and the application fields have been continuously expanded. systems are widely used. [0004] The microstructural model of ZnO vari...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/63C04B35/634
Inventor 刘勇飞
Owner 厦门ABB避雷器有限公司
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