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MoSi2 Heating Elements

MoSi2, heating element is a kind of resistance heating element basically made of pure Molybdenum Disilicide. In oxidizing atmosphere, a layer of compact quartz protective film is formed on the surface of MoSi2 element owing to the high temperature combustion, which prevent MoSi2 from continuously oxidizing. In oxidizing atmosphere, its Max temperature can reach 1800 oC., and its applicable temperature is 500 – 1700 oC. It can be widely used in such applications as sintering and heat treatment of ceramics, magnet, glass, metallurgy, refractory, etc. The commercial name of our MoSi2 heating elements is RADIANT MoSi2 HEATING ELEMENTS.

Chemical properties of elements Electric properties of elements

 

Dimension marks of elements

Material Grade: 1700, 1800
Diameter : D1/D2, mm/mm
Hotzone length : LE,mm
Cold end length : Lu, mm
Shank Spacing: A, mm

Examples:

U Shape, Material Grade 1800,
D1=3mm, D2=6mm, Le=140mm,
Lu=125mm, A=25mm

Specify as:
Radiant Super MS18, U Shape, 3/6 x 140 x 125 x 25

W Shape, 1700, D1=6mm, D2=12mm, Le=300mm, Lu=250mm, A=50m

Specify as:
Radiant Super MS17, W Shape, 6/12 x 300 x 250 x 50

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Physical properties of elements

 

 

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Chemical properties of elements  

In oxidizing atmosphere, a layer of compact quartz (SiO2) protective film is formed on the surface of element owing to the high – temperature combustion, which prevents MoSi2 from continuously oxidizing. When the element temperature is higher than 1700 oC, the SiO2 protective film will be fused, as its fusing point is 1710°C and the SiO2 is fused into molten drops, which causes it to loose its protective ability. In the oxidizing atmosphere, when the element is continuously used, the protective film forms again.

It should be pointed out that these elements cannot be used for rather long time in 400-700 oC, otherwise, it will be powdered, owing to the strong oxidizing action in low temperature.

 

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Electric properties of elements

 

Resistance properties :

The resistivity of these elements rapidly rises along with the increase in the temperature, under normal operating conditions. Generally the element resistance does not change with the application, so the old and new elements can be used together.

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