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Preparation method of medium-voltage gradient zinc oxide piezoresistor MOV chip

A varistor, voltage gradient technology, applied in the manufacture of resistor chips, resistor manufacturing, resistors, etc., can solve problems such as SPD safety tripping

Inactive Publication Date: 2020-04-17
常州泰捷防雷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, the surge protector SPD used in the low-voltage AC and DC power distribution system mostly adopts the design mode of power frequency overvoltage safety trip, and adopts the common / differential mode connection mode for line protection. The design and technical work of the surge protector SPD , the biggest technical problem is that the SPD fails to trip 100% safely under power frequency overvoltage

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  • Preparation method of medium-voltage gradient zinc oxide piezoresistor MOV chip
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  • Preparation method of medium-voltage gradient zinc oxide piezoresistor MOV chip

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Embodiment

[0077] A method for preparing a medium voltage gradient zinc oxide varistor MOV chip, comprising the following steps:

[0078] (1) Raw material preparation: zinc oxide: 88.25-91.03wt%, bismuth oxide: 3.17-4.89wt%, antimony oxide: 3.67-4.405wt%, cobalt oxide: 1.1-1.51wt%, manganese oxide: 0.7-0.9wt% , nickel oxide: 0.3-0.5wt%; aluminum nitrate: 0.02-0.05wt%, silver nitrate: 0.01-0.021wt%.

[0079] (2) Mixed grinding of doping materials: Mix all the raw materials, and the mixture of bismuth oxide, antimony oxide, cobalt oxide, manganese oxide, nickel oxide, aluminum nitrate and silver nitrate is the base material, and take 1.2-1.5 times the weight of the base material Deionized water, using deionized water as a solvent, conduct water-soluble ball milling on all raw materials for 2-2.5 hours, and the rotating speed of the ball mill is 420-470 rpm.

[0080] (3) continued ball mill: get the deionized water of zinc oxide weight 60.9-64.2wt%, add deionized water in the ball mill in ...

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Abstract

The invention discloses a preparation method of a medium-voltage gradient zinc oxide piezoresistor MOV chip. The preparation method comprises the following steps: (1) preparing raw materials: zinc oxide, bismuth oxide, antimony oxide, cobalt oxide, manganese oxide, nickel oxide, aluminum nitrate and silver nitrate; (2) mixing and grinding a doping material; (3) carrying out continuous ball milling; (4) spraying, drying, and granulating; (5) forming; (6) discharging glue; (7) sintering; (8) carrying out ball-milling and cleaning on the black bare chip; (9) carrying out annealing heat treatmenton the product; (10) coating with silver to form a conductive electrode, and reducing the conductive electrode; (11) coating the side surface with an insulating glaze; (12) welding a copper conductingwire electrode; and (13) packaging, and encapsulating to obtain the product. According to the invention, the piezoresistor can improve the power frequency voltage / current tolerance time under the same voltage gradient so as to provide enough tripping action time for a thermal tripping device of a surge protection device SPD.

Description

technical field [0001] The invention relates to the field of zinc oxide varistors, more specifically, it relates to a method for preparing a medium voltage gradient zinc oxide varistor MOV chip. Background technique [0002] Zinc oxide varistor is a polycrystalline semiconductor electronic ceramic made of multi-component metal oxides, mainly using zinc oxide (ZnO) as the main raw material, adding various components of metal oxides, using typical electronic ceramic material technology Prepared. Zinc oxide varistors fired at high temperature have excellent nonlinear volt-ampere characteristics and lightning wave shock absorption capacity, and are widely used in lightning arresters for power system line protection, which can absorb various overvoltages / currents that occur in power systems , including operating overvoltage / current, lightning overvoltage / current, etc., so as to effectively protect various key and important equipment of the power system. The protection of critic...

Claims

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Application Information

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IPC IPC(8): H01C17/00H01C17/02H01C17/28H01C17/30C04B35/453C04B35/622
CPCC04B35/453C04B35/622C04B2235/3262C04B2235/3275C04B2235/3279C04B2235/3294C04B2235/3298C04B2235/443H01C17/006H01C17/02H01C17/28H01C17/30
Inventor 石国能张琪岳涛
Owner 常州泰捷防雷科技有限公司
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