Ceramic barbecue furnace ceramic surface spraying is used for the substrate surface to form a ceramic coating, play a wear-resistant anti-corrosion effect, without the process of ceramic spraying into two categories, one is plasma spraying, the other is thermal spraying.

Spraying ceramic coating is the use of special equipment on the substrate surface using spraying process to form a high-hardness dense ceramic coating.

The volumetric resistor is the quotient of the DC voltage between the two electrodes placed on the relative two surfaces of the specimen and the steady current flowing through the two electrodes. Volume resistivity is the quotient of DC electric field strength and steady current density in insulating materials, that is, volume resistance in unit volume. Volume resistivity can be used as a parameter to select insulating materials, and the resistivity changes significantly with the change of temperature and humidity.

The measurement of volume resistivity is often used to check whether the insulating material is uniform or to detect conductive impurities that can affect the quality of the material without being detected by other methods.

The surface resistance is the quotient of the voltage added between the two electrodes on a surface of the specimen and the current flowing through the two electrodes after a certain period of time. The surface resistivity is the quotient of the DC electric field strength and the line current density in the surface layer of the insulating material, that is, the surface resistance within the unit area. The surface resistivity is not a parameter that characterizes the properties of the material itself, but a parameter about the surface pollution characteristics of the material. Because volumetric resistors are always more or less included in the test of surface resistance, the surface resistance can only be measured approximately, and the measured surface resistance values mainly reflect the degree of surface contamination of the test sample.