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Specifications
1. MoSi2 heating element2.type:U,W,UL,WL,Rod
3 Dia(mm):3/6,4/9,6/12,9/18,12/24
4.1700,1800,1900 typ
Lab Furnace MoSi2 Heating Elements
1.Molybdenum disilicide(MoSi2) heating element is a resistance generate-heating component made from MoSi2 or the basic material. It is used in high temperature under the oxidizing atmosphere, it looks like glass in its surface and form a light SiO2 glass film which can protect the element not to be oxidized. So this kind of element has unique effect for resisting oxidization in the high temperature. It is used to the highest temperature up to 1800°C during oxidizing atmosphere. And the applicable temperature is 500-1700°C.
2.Resistance property
The resistivity of element rapidly rises as the temperature rises. Under normal operating conditions, generally the element resistance doesn’t change with the service time changing. So the old and new elements can be mixed used.
3.Phiscal property
Volume Density |
5.5g/cm3 |
Porosity |
7.40% |
Bending Strength |
15-25kg/cm3 |
Water absorption |
1.20% |
Vickers Hardness |
(HV)570kg/mm2 |
Heating Elongation Rate |
4% |
4.Chemistry property
MoSi2 heating element is used in the high temperature under oxidizing atmosphere. It will form the SiO2 film which can keep the element from being melted. When the temperature of element is more than 1700°C,the MoSi2 heating element must not be used in the temperature between 400°C and 700°C for a long time; otherwise the element will be cremated under the strong oxidizing function in the low temperature.
5.The using temperature under the different atmosphere:
Atmosphere |
The Maximum Using Temperature of Element |
|
1700 Grade |
1800 Grade |
|
NO2,CO2,O2,Air |
1700°C |
1800°C |
He,Ar,Ne |
1650°C |
1750°C |
SO2 |
1600°C |
1700°C |
CO,H2 |
1500°C |
1600°C |
WetH2 |
1400°C |
1500°C |
DryH2 |
1350°C |
1450°C |
6. Recommend Surface load
Furnace Temp (C ) |
1400 |
1500 |
1600 |
1650 |
1700 |
Surface load of hot zone(w/cm2) |
<18 |
<15 |
<12 |
<10 |
<8 |
7.Usage
It can be used for high temperature furnace in ceramics, magnet, glass, metallurgy, refractory etc.
8. When you place order,pls kindly tell us the following things
Diameter of Hot Zone (D1):mm
Diameter of Cold End (D2):mm
Length of Hot Zone (Le):mm
Length of Cold End (Lu):mm
Shank spacing (A):mm
9. Installation of Elements
1) Vertically hanging
Under normal temperature, MoSi2 element is very brittleness, while under high temperature it is plasticity. So, the better way for installation if the U Shape element is to hang it vertically, to the furnace top through the support clamping chucks. The aim of such way is to avoid putting the mechanical stress directly to the element heat-generating end, or the element will easily be broken.
2) Support clamp
Support clamp are applied to 9/18 and 6/12 two kinds of elements respectively. The support clamp supports the whole weight of the element and the position of the element is also determined by it .therefore, it must be installed carefully to assure that the element it vertically hung. In order to prevent the element from being over heated locally, the taper part of the element lower end must put into the furnace chamber.
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