If the impurities react with silica, the melting point will be lowered.
The silica layer possesses the capacity to “clean itself” from adhering impurities.
When MoSi2 reacts with oxygen in the atmosphere, the layer of quartz glass is formed and under this a thin layer of molybdenum silicide with a lower silicon content Mo5Si3. This is due to the formation of a thin and adhesive protective layer of quartz glass on the surface. MoSi2 is a dense cermet material consisting of MoSi2 and an oxide component of mainly a glass phase and has the ability to withstand oxidation at high temperatures. With an ability to reach element temperatures of up to 1850☌ (3360☏) and watt densities of up to almost 200 watts per square inch, MoSi2 elements are peak performers. Molybdenum disilicide (MoSi2) heating elements are the element of choice when the application demands high temperatures beyond what conventional metallic and Silicon Carbide elements can support. They can be installed through side walls or rood, or project up through the hearth or used to heat furnaces that are too wide or too long to span with conventional elements. The single ended connection types allow even greater flexibility in furnace design. Silicon carbide heating elements are rigid throughout the range of operating temperatures so they can be installed horizontally or vertically without any additional supports. They handle a wide range of products and atmospheres efficiently, and temperatures can be controlled as closely as you like. Silicon Carbide equipped furnaces are versatile. There are no fuel storage problems, no worries about fuel availability and no noxious exhaust products to be ducted away. Electric furnace heating with silicon carbide elements is economical, dependable, clean, quiet and safe.
When element temperatures up to 1625☌ (2927☏) are required, Silicon carbide (SiC) heating elements are a desirable option with an impressive peak power density of 50 watts per square inch.
0 kommentar(er)
