Preparation of zinc oxide piezoresistor composite powder and compound additive agent powder

A composite additive, varistor technology, applied in the direction of varistor core, varistor, oxide conductor, etc. The problem of obtaining composite powder, etc., to achieve the effect of narrow particle size distribution, low price and dense structure

Active Publication Date: 2010-04-07
雷慧绪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method for the preparation of zinc oxide varistor composite powder is to mechanically mix (ball mill or vibration mill) the monomer powders according to the formula. With this method, even if a very good dispersant is added, it is difficult to Obtain evenly mixed composite powder
[0004] Since the 1980s, many researchers have devoted themselves to the study of liquid-phase chemical synthesis of zinc oxide varistor composite powders. Composite under process conditions, it is difficult to obtain composite powder that meets the requirements

Method used

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  • Preparation of zinc oxide piezoresistor composite powder and compound additive agent powder
  • Preparation of zinc oxide piezoresistor composite powder and compound additive agent powder
  • Preparation of zinc oxide piezoresistor composite powder and compound additive agent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment prepares 1 kg of zinc oxide varistor composite powder, and the formula of the zinc oxide varistor composite powder is:

[0053] ZnO 90.1893%, Bi 2 O 3 3.3929%, Ni 2 O 3 0.7039%, Sb 2 O 3 3.3272%, Co 2 O 3 1.3043%, Cr 2 O 3 0.7012%, MnCO 3 0.3775%, Al(NO 3 ) 3 ·9H 2 O 0.005529%.

[0054] In this example, metal Zn, Bi, Ni, Co, Cr, Mn, Al are used as raw materials and concentrated hydrochloric acid is used as solvent to prepare Zn salt, Bi salt, Ni salt, Co salt, Cr salt, Mn salt and Al salt solution respectively, The concentration of each salt solution is not strictly required, as long as no crystals are precipitated.

[0055] The process steps of preparing zinc oxide varistor composite powder are as follows:

[0056] (1) Mix according to the formula

[0057] Add Zn salt, Bi salt, Ni salt, Co salt, Cr salt, Mn salt and Al salt solution into the reaction vessel according to the amount required by the formula of zinc oxide varistor compo...

Embodiment 2

[0076] The present embodiment prepares 5 kilograms of zinc oxide varistor composite powder, and the formula of the zinc oxide varistor composite powder is:

[0077] ZnO 90.1893%, Bi 2 O 3 3.3929%, Ni 2 O 3 0.7039%, Sb 2 O 3 3.3272%, Co 2 O 3 1.3043%, Cr 2 O 3 0.7012%, MnCO 3 0.3775%, Al(NO 3 ) 3 ·9H 2 O 0.005529%.

[0078] In this example, metals Zn, Bi, Ni, Co, Cr, Mn, Al are used as raw materials, and a nitric acid solution with a mass concentration of 30% is used as a solvent to prepare Zn salt, Bi salt, Ni salt, Co salt, Cr salt, and Mn salt respectively. , Al salt solution, the concentration of each salt solution is not strictly required, as long as there is no crystal precipitation.

[0079] The process steps of preparing zinc oxide varistor composite powder are as follows:

[0080] (1) Mix according to the formula

[0081] Add Zn salt, Bi salt, Ni salt, Co salt, Cr salt, Mn salt and Al salt solution to the reaction vessel according to the amount requ...

Embodiment 3

[0099] The present embodiment prepares 1 kg of zinc oxide varistor composite additive powder, and the formula of the zinc oxide varistor composite additive powder is:

[0100] Bi 2 O 3 36.70%, Sb 2 O 3 40.50%, Ni 2 O 3 8.80%, Co 2 O 3 8.60%, MnO 2 4.28%, Y 2 O 3 0.82%, Cr 2 O 3 0.20%, Al 2 O 3 0.10%.

[0101]In this example, metal Bi, Ni, Co, Mn, Y, Cr, and Al are used as raw materials, and concentrated hydrochloric acid is used as solvent to prepare Bi salt, Ni salt, Co salt, Mn salt, Y salt, Cr salt, and Al salt solution respectively. , the concentration of each salt solution is not strictly required, as long as there is no crystal precipitation.

[0102] The process steps of preparing zinc oxide varistor composite additive powder are as follows:

[0103] (1) Mix according to the formula

[0104] Add Bi salt, Ni salt, Co salt, Mn salt, Y salt, Cr salt and Al salt solution into the reaction vessel according to the amount required by the formula of zinc...

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Abstract

The invention is a preparing method of a zinc-oxide varistor composite powder and a zinc-oxide varistor composite additive powder, comprising the steps of: (1) mixing according to the formulation, (2)liquid phase coprecipitation, (3) filtering and washing, (4) adding antimony tartrate or colloidal antimony oxide, (5) drying and calcining, and (6) screen separating. In steps (1) and (2), the saltsolutions of the component are uniformly mixed and liquid phase coprecipitated, ensuring the uniformity of the zinc-oxide varistor composite powder. The coprecipitation agent is NaOH or Na2CO3, the coprecipitation promoter is NH4OH. In step (2), the mixed solution of the coprecipitation agent and the coprecipitation promoter is added to a reaction system, so that each component can be combined instantaneously under the same process condition. The method can produce a zinc-oxide varistor composite powder and a zinc-oxide varistor composite additive powder which have a granularity of less than 1mum, narrow granularity distribution scope, uniform components and impurity of no more than 0.01%.

Description

technical field [0001] The invention belongs to a preparation method of a zinc oxide varistor composite powder. The composite powder is used in the electronics and electric power industries as a component material of a zinc oxide varistor and a zinc oxide gapless arrester valve plate. Background technique [0002] In the electronics and power industries, it is used as a composite powder for the manufacture of zinc oxide varistors and zinc oxide gapless arrester valves. Its components are nearly 10. ZnO is the main component, with a content of about 90%. Other components with bismuth trioxide (Bi 2 O 3 ), antimony trioxide (Sb 2 O 3 ), cobalt trioxide (Co 2 O 3 ), chromium trioxide (Cr 2 O 3 ), nickel trioxide (Ni 2 O 3 ), silicon dioxide (SiO 2 ), manganese carbonate (MnCO 3 ) and other additives. This kind of composite powder requires high purity, uniform composition, small grain size, fine particle size, standard normal distribution of particle size, large spec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/112H01B1/08B22F9/00
Inventor 雷慧绪
Owner 雷慧绪
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