The maximum operating temperature of molybdenum is approximately 1900 °C.
At temperatures higher than that, tungsten must be used as a replacement.
Molybdenum is widely used in many industries due to its advantageous properties.
What is the Maximum Operating Temperature of Molybdenum? 7 Key Facts You Need to Know
1. Molybdenum in KINTEK Furnaces
In KINTEK furnaces, the maximum operating temperatures are in the range of 1500-1800 °C.
Molydisilicide heating elements are used in these furnaces.
These elements have the ability to quickly attain and sustain high temperatures.
They also have an affinity for oxidizing atmospheres.
The maximum temperature of the molydisilicide heating elements is always 100 °C higher than the maximum rated furnace temperature.
For example, 1800 °C elements are used in 1700 °C furnaces.
If operation in inert atmospheres is required, either a higher temperature element or a restriction on the maximum furnace operating temperature needs to be considered to accommodate element limitations.
2. Molybdenum Resistors
Molybdenum resistors can withstand temperatures up to 1650 °C.
They are ductile enough to be drawn into wire for resistor windings.
The supports or insulators of the winding should be made of magnesia or zirconia.
Molybdenum resistors cannot be operated in air and must be protected against reactions with silicon and carbon.
However, molybdenum is immune from reactions with sulphur, nitrogen, hydrogen, and water vapor.
Typically, a hydrogen atmosphere is used for the protection of these resistors.
Molybdenum is not suitable for resistors in vacuum furnaces due to its high vapor pressure.
3. Tungsten Resistors
Tungsten resistors, on the other hand, can be used for temperatures up to 2000 °C.
The maximum temperature is limited by the refractory supports of the resistor.
Tungsten has a low vapor pressure, making it useful for resistors in vacuum furnaces.
4. MHC and Lanthanated Molybdenum
MHC (molybdenum-hafnium-carbide) is recommended for use up to a 1550 °C element temperature.
Lanthanated molybdenum (MoLa) is another option and can be used up to a 2000 °C element temperature.
Lanthanated molybdenum contains lanthanum trioxide particles that form a "stacked fiber" grain structure.
This provides excellent resistance to recrystallization and high-temperature warpage.
5. Molybdenum Crucibles
Molybdenum crucibles are used in environments with working temperatures generally above 2000 °C.
They are widely used in sapphire single crystal growth furnaces, quartz glass smelting furnaces, and rare earth smelting furnaces.
The quality of molybdenum crucibles, such as high purity, high density, precise size, and smooth inner and outer walls, affects the success rate of seed crystals and the quality of pulling crystals during the growth of sapphire crystals.
6. Silicon Molybdenum Rods
Silicon molybdenum rods are commonly used in furnaces with temperatures ranging from 1300 °C to 1800 °C.
They are used in various industries, including metallurgy, glass, ceramics, magnetic materials, refractories, crystal, electronic components, and furnace manufacturing.
Silicon molybdenum rods are ideal heating elements for high-temperature sintering in industrial high-temperature furnaces.
7. Molybdenum Disilicide
Molybdenum disilicide has similar mechanical properties to ceramic products.
It is brittle and can easily break at high temperatures.
Proper installation and handling can help avoid these difficulties.
Continue exploring, consult our experts
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