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Elmet Technologies

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Zircar Ceramics MOSI2 Molybdenum Disilicide Heating Element
Categories: Ceramic; Oxide; Silicon Oxide

Material Notes: ZIRCAR Molybdenum Disilicide Heating Element Type MOSI2 is an electric element principally containing molybdenum disilicide for use in industrial and laboratory furnaces. Elements fabricated of this unique material support high power densities on their surface (e.g. 20 W/cm² of element surface area at an element temperature of 1700°C, 14 W/cm² at  1800°C and 5 W/cm² at 1900°C), can be cycled rapidly, and  provide up to 10KVA / sq. ft. power density in rapid cycle and continuous furnace applications. 3 grades are available with maximum element temperatures of 1700°C, 1800°C and 1900°C in air.

Made of molybdenum disilicide based cermets MOSI2 heating elements withstand oxidation at very high temperatures. Their surface is protected by of a thin layer of silica glass that forms when they are exposed to oxygen at elevated temperatures. Although the base cermet is consumed in the formation of the silica "skin" the rate of decomposition is minimal. They provide long performance at elevated temperatures while delivering high power.

Typical Applications:

  • Heating source in furnaces and industrial process equipment operating to 1800ºC (3272ºF).
  • Elements in production, laboratory and research furnaces for annealing, heat treating, forging, ceramic and metal sintering, glass and metal melting, holding & refining, testing and gem enhancement.

Information provided by Zircar Ceramics.

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Physical PropertiesOriginal ValueComments
Density 5.50 - 5.60 g/cc
Porosity <= 2.0 %
 
Mechanical PropertiesOriginal ValueComments
Hardness, Mohs 7.5 - 7.8
@Temperature 26.9 °C
Tensile Strength >= 190 MPa
@Temperature 1530 °C
Flexural Strength >= 350 MPa
@Temperature 26.9 °C
Impact 0.70Impact Strength, MPa
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity 0.000353 ohm-cm
 
Thermal PropertiesOriginal ValueComments
CTE, linear 7.00 - 8.00 µm/m-°C
Maximum Service Temperature, Air 1700 - 1900 °CDepends on Grade
 
Optical PropertiesOriginal ValueComments
Emissivity (0-1) 0.74 - 0.82

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CZIR903 / 138545

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