Varistor Grade Zinc Oxide Powder

Varistor grade zinc oxide powder

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MST 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.

The advantages of varistor made of 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 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 varistor grade zinc oxide powder can be improved.

Zinc oxide varistors made of varistor grade zinc oxide powder can be divided into low voltage and high voltage according to their application environment.

* Low-voltage varistors made of 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 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.