Élément chauffant en molybdèneest un composant électronique qui comprend principalement deux siliciures, qui est utilisé pour les fours industriels et de laboratoire. L'élément fait de ce matériau unique peut résister à la densité de puissance élevée du matériau sur sa surface (par exemple, la surface de l'élément 20 W/cm2 peut supporter la température de l'élément de 1700 C, la surface de l'élément 14 W/cm2 peut supporter 1800 degrés C, la surface de l'élément de 5 W/cm2 peut supporter 1900 degrés C), de sorte que l'élément puisse circuler rapidement.
L'élément chauffant à deux siliciures est en platine à base de molybdène à oxydation à haute température. Lorsqu'ils sont exposés à l'air et soumis à des températures élevées, la surface de ces composants est protégée par une fine couche de verre de silicium. Bien que la céramique de la matrice soit consommée sous forme de peau de silicium, sa vitesse de décomposition est très faible. À des températures élevées, ils peuvent avoir une puissance élevée et générer une énergie élevée en même temps.
With the decomposition of cermet, the diameter of heating handle decreases, and the resistance components will increase continuously. The two silicide heating element does not show the aging of silicon carbide, metal Fe Cr Aluminum Alloy elements. Two silicified heating element can operate at high temperature, and has the longest life in the oxidizing atmosphere. They can operate in other atmospheres, but at lower temperatures.
Mise en place et utilisation
Due to the highest temperature and the highest power and the longest life, two silicified heating elements must be installed in a freeway. The elements must be placed far away from the wall of the furnace so that they can move naturally when they are affected by the release of internal stress, or when they are twisted and twisted with the electromagnetic action of the adjacent elements. We suggest that the use of furnace support devices include heating element support and heating element straps, so as to support and connect the terminal handle. At low temperature, the two silicified heating element is fragile and must be carefully operated. When the temperature reaches more than 1200 C, they become softer and relaxed under their own load, and when the components are heated to resist each other, they become the "Coca-Cola bottle" shape.
The two silicified heating element with the bent terminal can be installed through the side wall of the furnace lining. The heating element support is to ensure the terminal. When components are installed directly by means of refractories or touch insulation, they must be free to move. In the operation of this way, the maximum temperature of the two silicified "skin" will be reduced, and the change of pressure may lead to disastrous consequences.
Two, silicified molybdenum heating element shows a significant positive temperature resistance coefficient. When the component temperature is increased, the resistivity will also increase. When the component is launched at the very beginning, a very typical phase angle emitted by a thyristor rectifier with current limiting will control the high current at this time. After heating, its electrical resistivity increases, and the current flow is limited by itself.
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