SiC Heating Elements
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Related Categories
- Heavy Duty SiC Heating Elements
- Industrial SiC Heating Elements
- Large SiC Heating Elements
- Miniature SiC Heating Elements
- SiC Heat Elements
- SiC Heater Elements
- Silicon Carbide Heat Elements
- Silicon Carbide Heating Elements
- Silicone Carbide Heater Elements
- Silicone Carbide Heating Elements
- Small SiC Heating Elements
- Custom SiC Heating Elements
SiC Heating Elements
A SiC heating element, or silicon-carbide heating element, is a type of non-metallic high temperature electric heating element. Using silicon and carbide as the main raw materials, SiC heating elements are capable of higher operating temperatures and watt loadings than metallic heating elements. Typically either an extruded tubular rod or cylinder, SiC heating elements are self-supporting and can be used in furnaces that are too wide or too long for metallic or MoSi2 heating elements. Additional advantages include anti-corrosion, heat zone resistance, little deformation, cold end resistance, easy maintenance and a long service life. However, there are some disadvantages which include the risk of fracture, increased electrical resistance over time as well as more expensive power control equipment than metallic heating elements. SiC heating elements are widely used for applications such as electric furnaces, kilns and other electric heating devices in industries including powder metallurgy, ceramics, metal processes, glass, semiconductor, scientific research and electronics.
SiC heating elements are formed through either a reaction-bonding process or a recrystallization process. In the reaction bonding process, liquid silicon is used to infiltrate compacts made of mixtures of SiC and carbon. As a result, the silicon then reacts with the carbon in order to form silicon carbide. In the recrystallization process, high-density, high-purity green silicon carbide is formed into a blank and then silicided under extremely high temperatures. Next the silicon carbide is recrystallized and fine grains of silicon carbide are formed that act as connection points between large grains, resulting in conductive pathways. As a result of the high heat resistance of silicon carbide, temperatures must be in excess of 3900ºF (2150°C) in order for either process to work. SiC heating elements can be used in temperatures ranging from 600°C to 1650°C and does not require a protective atmosphere. While there are several external factors that can affect the service life of SiC heating elements including type of service, furnace atmosphere, maintenance and watt density, SiC heating elements will most likely fail mechanically rather than as a result of aging.
