Molybdenum disilicide heating elements
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Description
| 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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Molybdenum disilicide heating elements