What is the important role of the quality of insulating coatings in the quality of resistance

Update:06-06-2022
Insulation resistivity is a physical quantity used to express the resistance characteristics of various substances. The resistance of a wire made of a certain material with a length of 1 meter and a cross-sectional area of ​​1 square meter at room temperature is called the resistance of the material. resistivity. ZS-1091 high temperature smart home relay  resistant insulating paint resistivity is a physical quantity used to express the resistance characteristics of various substances. Made of a material with a length of 1 meter and a cross-sectional area of ​​1mm2 meters. The resistance of a conductor is numerically equal to the resistivity of the material.

The resistivity ρ is not only related to the material of the conductor, but also related to the temperature of the conductor. In the range where the temperature does not change much, the resistivity of almost all metals changes linearly with temperature, that is, ρ=ρo(1+at). where t is the temperature in Celsius, ρo is the resistivity at 0°C, and a is the temperature coefficient of resistivity.Since the resistivity changes with temperature, the physical state of some electrical appliances must be explained for the resistance of some electrical appliances.

Basis for insulating coatings in the production process: insulating coatings strictly control the production of raw materials in the production process to avoid the introduction of stray ions, especially alkali metal or alkaline earth metal ions; ZS-1091 high temperature insulating coating minimizes glass The content of the phase and the conductivity of the glass phase added to improve the process performance should be reduced as much as possible, and the content of metal ions and the content of glass phase should be considered as one of the main parameters when purchasing insulating coatings.

In the production process of insulating coatings, manufacturers also pay attention to strictly control the introduction of variable valence metal ions such as iron and cobalt to avoid free ions and holes. At the same time, the temperature and flame atmosphere in the production process are strictly controlled to avoid the occurrence of electrons and holes due to redox reactions, and to prevent crystal defects caused by lattice conversion. High temperature insulating ceramic coatings can be painted on various materials, cured at room temperature, and the curing time is more than 24 hours. Therefore, the quality of the insulating coating is also an important part of the resistance quality in the production process of the wirewound resistor.
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