Abstract
Silicon carbide is widely used as an electrical heating element because of its excellent thermal and mechanical properties and its electrical resistivity. However, the increase of the electrical resistivity with running time and temperature limits the industrial development of the SiC heating elements. The processes responsible for ageing are not well understood, but it is generally assumed that this phenomena is primarily associated with the oxidation. The present work is a review of the substantial effort that has been made to determine and understand the effects of oxidation with respect to the properties, performance and durability of various commercialized silicon carbide heating elements. This review encompasses measurements of the main characteristics (crystalline phases, composition, density, porosity, flexural strength, thermal conductivity, oxidation and electrical resistivity).
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