Two-shank MOSI2 Heating Element

 

SUPER MOSI2 HEATING ELEMENT

Physical Properties

 Density: 5.6 g/cm3
- Tensile strength at 1550C: 100 Mpa+/-25%
- Bending strength at 20C: 450 Mpa +/-10%
- Compression strength at 20C: 1400~1500 Mpa
- Hardness, HV, at 20C: 9 Gpa
- Porosity: less than 1%
- Thermal conductivity: 20~600C: 20 W m-1 K-1
                        600~1200C: 15 W m-1 K-1
- Coefficient of linear expansion: 7~8*10-6 K-1
- Emissivity: 0.7~0.8 
 Chemical Properties

Oxygen-resistance under high temperature: in oxidizing atmosphere, on the surface of MoSi2 element owing to the high-temperature combustion a layer of compact quartz (SiO2) protective film is formed to prevent MoSi2 from continuously oxidizing. When the element temperature is higher than 1700?, the SiO2 protective film, Whose fusing point is 1710?, is fused, and the SiO2 is fused into molten drops owing to the action of its surface extension, so that loses its protective ability. In the oxidizing atmosphere, when the element is continuously used, again the protective film forms. It should be pointed out that MoSi2 heat-generating element cannot be used for rather long time in 400-700 degree, or it will be powdered owing to the strong oxidizing action in low temperature.