A-coating SiC heating elements
SiC heating elements have high porosity (about 23%), so SiC is slowly oxidized at high temperatures, SiO2 generated from materials, then resistance of elements gradually increased (aging). Generally, SiO2 protective film on the surface of heating elements will prevent from further oxidization due to the presence of oxygen.
Classification:
Key words:
Coating type: A coating
Appearance: Black with glassy luster
Use: SiC heating elements have high porosity (about 23%), so SiC is slowly oxidized at high temperatures, SiO2 generated from materials, then resistance of elements gradually increased (aging). Generally, SiO2 protective film on the surface of heating elements will prevent from further oxidization due to the presence of oxygen. But trace amount of water vapor has significant oxidization effects on heating elements, with the reaction equation as follows:
SiC+ 4H2O →SiO2+ CO2+ 4H
In order to extend the service life and slow down aging, we have developed A coating SiC heating elements, with a dense quartz glass film on the surface, just similar to the glaze layer on the ceramic surface, covering surface pores and reducing the oxidization of heating elements by oxygen and vapor. The service life of heating elements is extended by more than 30% in furnaces where there is oxidizing gas and vapor.
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