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Tube furnace MoSi2 silicon carbide heating element selection
Silicon molybdenum rod ( located in the hearth around ) .
MoSi2 heating element is a kind of molybdenum silicide based resistive heating element . Molybdenum silicide sintered article in an oxidizing atmosphere heated to high temperature , the quartz glass film formed on the surface dense layer , it can not maintain the oxidation products . Therefore silicon molybdenum rod element has a unique high-temperature oxidation resistance. The maximum temperature in an oxidizing atmosphere to 1750 ℃. Resistivity silicon molybdenum rod element does not change with change ( resistance increases with increasing temperature ) , which is not aging , so the old and new components can be mixed using the length of time . MoSi2 mechanical system components and other ceramic products like brittle materials at room temperature are easily broken , but the proper use and installation reasonable be avoided.
Silicon carbide ( distributed around the hearth or four weeks )
Carbide is the choice of high-quality green silicon carbide as the main raw material, light processing system Bah, high temperature silicon in non-metallic rod made of high-temperature heating element crystallization . Compared with the element of metal heating elements, with the use of high temperature, anti-oxidation , corrosion resistance, long life, micro deformation , easy installation and maintenance. Silicon carbide having a large specific resistance , heated in air , the surface temperature of the heat generating portion can reach 1450 ℃; from room temperature to 800 ℃ is negative , a positive value over 800 ℃ characteristic curve. Silicon carbide has good chemical stability, acid
It has no effect, but erosion of alkali and alkaline earth metal oxides under certain temperature conditions to exert . Under high temperature , water vapor , hydrogen , halogen, sulfur oxide and its erosion also . Oven and stick to bear the load evenly and must be pre- installed with resistance , resistance to maintain consistent ± 10%; EAF long-term use , the individual rods damaged due to other reasons, needs to be replaced , according to the prevailing growth resistance , choose fill resistance suitable rod, the rod can not take any new replacement . Best of all , if the resistance rods damaged more or grow too large , can not achieve the desired oven temperature when replaced with a new stick. Down the bar to re- measure its resistance with low temperature resistance .
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