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A kind of ceramic material of ZNO varistor with large flow and medium voltage and preparation method thereof

A technology of varistors and porcelain materials, applied in the direction of varistors, varistor cores, etc., to achieve the effects of expanding the application range, improving the flow capacity, and improving performance

Active Publication Date: 2019-02-12
BAOJI RUIFENG ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since its invention, ZnO varistors have been widely used because of their low cost, convenient manufacture, large nonlinear coefficient, fast response time, and large flow capacity, especially ZnO varistors have excellent The nonlinear volt-ampere characteristics and the ability to absorb impact energy make it a rapidly developing and widely used voltage protection device in AC and DC power systems and electronic circuits. The volume and weight of the resistor make it more miniaturized, how to improve the flow capacity of the varistor while reducing the production cost and other problems

Method used

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  • A kind of ceramic material of ZNO varistor with large flow and medium voltage and preparation method thereof
  • A kind of ceramic material of ZNO varistor with large flow and medium voltage and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] 1. Ingredients. Firstly, make sure that the quality of various materials meets the specified requirements: ZnO content ≥ 99.7%, impurity Na + , Fe 2+ content≤20ppm; Bi 2 o 3 Content ≥99%; Sb 2 o 3 Content ≥99.8%; Co 3 o 4 The content is between 71%-73%; Cr 2 o 3 Content ≥99%; Mn 3 o 4 Medium manganese content ≥ 71%; Ni 2 o 3 The nickel content in the medium is between 73-76%; B 2 o 3 Content≥99%; A1(NO 3 ) 3 9H 2 O content ≥ 99%. Then according to the following porcelain formula, accurately weigh the ingredients: ZnO 100kg, Bi 2 o 3 1.43kg, Sb 2 o 3 2.65kg, Co 3 o 4 0.585kg, Cr 2 o 3 0.504kg, Mn 3 o 4 0.458kg, Ni 2 o 3 0.406kg, B 2 o 3 2.51g, A1(NO 3 ) 3 9H 2 O10g.

[0024] 2. Ball milling. Put the weighed material into the stirring ball mill, add 58Kg of pure water, 8kg of PVA binder (polyvinyl alcohol), and stir the ball mill for 3 hours (the balls account for 2 / 3 of the effective volume of the ball mill).

[0025] 3. Spray g...

Embodiment 2

[0027] Embodiment 2: The process steps are basically the same as in Embodiment 1, except that the ceramic material formula is different: ZnO 100kg, Bi 2 o 3 1.81kg, Sb 2 o 3 2.71kg, Co 3 o 4 0.683kg, Cr 2o 3 0.650kg, Mn 3 o 4 0.512kg, Ni 2 o 3 0.453kg, B 2 o 3 2.58g, A1(NO 3 ) 3 9H 2 O11g.

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Abstract

A large-through-current medium-voltage ZnO pressure-sensitive resistance ceramic material and a preparation method thereof. The preparation method includes the following steps: mixing ZnO, Bi2O3, Sb2O3, Co3O4, Cr2O3, Mn3O4, Ni2O3, B2O3 and Al(NO3)3.9H2O according to ratio uniformly, performing wet-method ball milling to prepare slurry, performing spray granulation to the slurry to obtain a solid ceramic material, sieving the solid ceramic material, and sealing and aging the solid ceramic material to prepare the finish product. Through change on additives and ratio thereof in the medium-voltage ZnO pressure-sensitive resistance ceramic material, the through-current capability of the material is increased from 6 KA / cm<2> in the prior art to 8 KA / cm<2>. The total amount of the additives in the material is low, and especially expensive AgNO3 is omitted, thereby greatly reducing cost.

Description

technical field [0001] The invention belongs to the field of electronic materials, and in particular relates to a ZnO varistor ceramic material with large flow and medium voltage and a preparation method thereof. Background technique [0002] ZnO varistor is based on ZnO powder, adding a variety of trace amounts of other metal compound additives (such as Bi 2 o 3 , Sb 2 o 3 , MnCO 3 、Co 2 o 3 、Cr 2 o 3 etc.), a polycrystalline multi-phase semiconductor ceramic element that is sintered at high temperature after mixing and molding. Since its invention, ZnO varistors have been widely used for their low cost, convenient manufacture, large nonlinear coefficient, fast response time, and large flow capacity, especially ZnO varistors have excellent The nonlinear volt-ampere characteristics and the ability to absorb impact energy make it a rapidly developing and widely used voltage protection device in AC and DC power systems and electronic circuits. The volume and weight o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/112C04B35/453C04B35/622
CPCC04B35/453C04B35/622C04B2235/3241C04B2235/3263C04B2235/3277C04B2235/3279C04B2235/3294C04B2235/3298C04B2235/3409C04B2235/443H01C7/112
Inventor 黄欣刚
Owner BAOJI RUIFENG ELECTRONICS TECH CO LTD