Durable Varistor Grade Zinc Oxide Powder
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Durable Varistor Grade Zinc Oxide Powder

MST® Durable Varistor Grade Zinc Oxide Powder has good thermal stability and thermal conductivity, high boiling point and low thermal expansion coefficient. The band gap is 3.2-3.4eV. ZnO should be an insulator at room temperature. ZnO is decomposed at high temperature. Excessive zinc enters the gap due to ionization, forming interstitial ions, causing shared movement of electrons in the structure, forming an n-type semiconductor, which is an important raw material for the production of zinc oxide varistors.As the professional manufacture, we would like to provide you MST® Durable Varistor Grade Zinc Oxide Powder. And we will offer you the best after-sale service and timely delivery.

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Product Description

MST® Durable Varistor Grade Zinc Oxide Powder

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MST® Durable Varistor Grade Zinc Oxide Powder has good thermal stability and thermal conductivity, high boiling point and low thermal expansion coefficient. The band gap is 3.2-3.4eV. ZnO should be an insulator at room temperature. ZnO is decomposed at high temperature. Excessive zinc enters the gap due to ionization, forming interstitial ions, causing shared movement of electrons in the structure, forming an n-type semiconductor, which is an important raw material for the production of zinc oxide varistors.

  

Product name

Zinc oxide  

Molecular formula

ZnO

CAS NO

1314-13-2

EINECS NO

215-222-5

Density

5.606g/cm3

Molecular weight

81.38

Melting point

1975℃

Boiling Point:

2360ºC

Purity

0.99

Active substance content

0.997

H.S CODE

2817001000

Appearance

White powder or crystal

 

The advantages of varistor made of Durable Varistor Grade Zinc Oxide Powder:

* Varistor semiconductor ceramics refer to semiconductor ceramics whose resistance value has a significant nonlinear relationship with the applied voltage. It becomes a varistor after adding electrodes when in use. Varistors are widely used in overvoltage protection and voltage stabilization.

* There are two main types of semiconductor materials for making varistors: SiC and ZnO. The I-V nonlinear characteristics of these two types of varistors are derived from the grain boundary barrier in the ceramic body. Compared with SiC varistor, ZnO varistor has unique excellent performance such as large nonlinear coefficient, short response time, low residual voltage, small voltage temperature coefficient, and small leakage current. Therefore, it is used in electronic circuits and household appliances. In the field of voltage stabilization and overvoltage protection of power systems, the development and application of ZnO varistors play a pivotal role.

* The performance of ZnO varistor made from Durable Varistor Grade Zinc Oxide Powder depends on its microstructure and product size. Its microstructure is often caused by the type and amount of dopants added, and the powder preparation process. The size, size distribution, shape, uniformity, etc. are determined by factors such as sintering process, calcination temperature, calcination time, heating and cooling speed. By optimizing these factors, the performance of the ZnO varistor made of Durable Varistor Grade Zinc Oxide Powder can be improved.

Item


Zinc oxide(Zn0 calculating as dry materia)% ≥

99.7

Potassium oxide(K)%≤

0.001

Sodium oxide(K)%≤

0.001

Ferric oxide (Fe)%≤

0.002

Cadmium oxide (Cd)%≤

0.001

Lead oxide(Pb)%≤

0.005

Copper oxide(Cu)%≤

0.0002

Metal content(as Zn)% ≤

NONE

moisture%

0.3

Insoluble Matter in Hci %  ≤

0.004

Loss on ignition % ≤

0.2

PH

7.0-8.0

The average particle size(D50)um ≤

0.5

Residue on sieve (44um)% ≤

0.1

 

Zinc oxide varistors made of Durable Varistor Grade Zinc Oxide Powder can be divided into low voltage and high voltage according to their application environment.

* Low-voltage varistors made of Durable Varistor Grade Zinc Oxide Powder are mainly used in microelectronic equipment, integrated circuit modules in telephone exchanges, and transistor surges;

* High-voltage varistors made of Durable Varistor Grade Zinc Oxide Powder are mainly used in high-voltage and ultra-high-voltage power transmission systems, operation protection of large equipment, and atmospheric overvoltage protection.

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