Molybdenum heating element is an electronic component which mainly includes two silicides, which is used for industrial and laboratory furnaces. The element made of this unique material can withstand the high power density of material on its surface (for example, the surface of the 20 W/cm2 element can withstand the element temperature of 1700 C, the surface of the 14 W/cm2 element can bear 1800 degrees C, the 5 W/cm2 element surface can bear 1900 degrees C), so that the element can be circulated quickly.
The two silicide heating element is made of molybdenum based platinum to oxidation at high temperature. When exposed to air and subjected to high temperatures, the surface of these components is protected by a thin layer of silicon glass. Although the matrix ceramic is consumed in the form of silicon skin, its decomposition rate is very low. At high temperatures, they can have high power and generate high energy at the same time.
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.
Installation and use
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.
WELCOME TO INQUIRE US PRICE AND VISIT OUR COMPANY FACILITIES!
Contact information:
E-mail: mail@refrachina.com
Telephone:86-29-85325399
Fax： 029-85325610
