High Temperature Industrial Furnace Heating Elements Mosi2 Heaters

High Temperature Industrial Furnace Heating Elements Mosi2 Heaters

High temperature industrial furnace heating elements Mosi2 heaters product description MoSi2 heating elements is a kind of resistance heating element made from Molybdenum Disilicide. It can be used in air and various gases environments. Working temperature of MoSi2 heating element is 1300C to...

High temperature industrial furnace heating elements Mosi2 heaters

product description

MoSi2 heating elements is a kind of resistance heating
 element made from Molybdenum Disilicide.
It can be used in air and various gases environments. Working temperature of MoSi2 heating element is 1300C to 1800C. It has the characteristics of high temperature resistance, oxidation resistance, corrosion resistance, heating fast, long service life, high temperature low distortion, easy installation and maintenance, excellent chemical stability, which has been widely used as heaters in high temperature furnaces and kilns of metallurgy, glass, ceramic refractory, crystal electronic device, industrial furnace manufacture and chemical industry field.
Types of MoSi2 Heating Elements
1. According to temperature: 1700C and 1800C
2. According to Shape: U, W, I, UL, WL, Spiral types.
MoSi2 heating elements standard size
(Hot zone dia / Cold zone dia)
3/6mm, 4/9mm, 6/12mm, 9/18mm, 12/24mm.
Chemical property
High temperature oxidation resistance:

When MoSi2 elements are used at high temperature and under oxidation circumstance, a dense layer of quartz (SiO2) is generated on the surface of the element to prevent it from further oxidation.

When the temperature of element is over 1700ºC, the SiO2 protecting film whose melting point is 1710ºC will be melted. Due to its surface tension, SiO2 agglomerate() into drops and lose protection. The SiO2 protecting film is formed again when the element continues to be used under the oxidation circumstance.

It must be pointed out is that the MoSi2 heating element cannot be used in the temperature between 400ºC to 700 ºC for long time. Otherwise, the element will be pulverized because of the strong low-temperature oxidation.
Resistance characters
MoSi2 elements have good resistance characteristic, so it is an ideal heating material to replace traditional heating elements.
At room temperature, its resistivity is very low, with the increase of temperature, the resistance increases sharply. The advantages of heating up fast and low power consumption are obvious. 
In normal operating circumstances, the resistance of the element is constant, so the old and new components can be mixed.
Physics characters

Bulk densityBending strengthHardnessApparent porosityDrawing water rate()Thermal elongation rate()
5.6~5.8g/cm3 20MPa(20ºC)(hv)570kg/mm²0.5~2.0%0.5%4%

Recommend surface load:

Furnace Temp(°c)14001500160016501700
Surface load of hot zone(W/cm²)<18<15<12<10<8

Atmosphere influence on the MoSi2 heater's operating temperature

AtmosphereThe max element temperature(ºC)

N2 16001700
He  Ar  Ne  Argon, Helium16001700
Dry Hydrogen(dew point) -80ºC11501150
Wet Hydrogen(Dew point) -20ºC14501450
mixed gas(e . g . 10%CO2, 50%CO, 15% H2)16001700
mixed gas(e . g . 40%CO2 , 20%CO)14001450
Cracked and partly burnt ammonia 14001450

Installation of heating element for electronics
1) Vertically hanging
Under normal temperature, MoSi2 element is very brittleness, while under high temperature, it is plasticity, so the better way to install U Shape element is to hang it vertically from the furnace top through the support clamping chuck. The aim of such way is to avoid putting the mechanical stress directly to the element heat-generating end; otherwise the element will easily be broken.
2) Support clamp
Support clamp are applied to 9/18 and 6/12 two kinds of elements respectively. The support clamp supports the whole weight of the element and the position of the element is also determined by it, therefore, it must be installed carefully to assure the element vertically hung. In order to prevent the element from being over heated locally, the taper part of the element lower end must put into the furnace chamber. 

Itemnamedistinction criterionspecificationUsing range
Heating elements1700  typeElement operating temperature 1700ºC is acceptableLe Φ
6-12W type/U type/L type/all kinds of hetero type / stripe shape
high temperature electric resistance furnace
1800  typeElement operating temperature 1800ºC is acceptable
1800J typeElement operating temperature≥1800ºCLe Φ
3-12W type
Special,high temperature and high-power electric resistance furnace
1800T typeElement operating  temperature≤1800ºCLe Φ
3-12W type U type
Not oxidized special air high temperature electric resistance furnace

Product use and maintenance
1. MoSi2 heating elements belong to Metal ceramic material. They are hard, crisp and low impact strength at room temperature .Therefore to be careful to avoid damage during transport and installation.
2. When MoSi2 elements continuously operate in an oxidation atmosphere, the surface temperature of 1700 type should not exceed 1700 ° C,1800-type should not over 1800 ºC and for intermittent use,1700 type-element should not over 1650 ° C,1800type-element cannot exceed 1750 ºC.
Furnace dryness
New or old furnace not used for a long time needs to be dried before using. Generally, the drying temperature is 100-200ºC.
However, if the element is used for a long time under the low temperature, it will cause the low-temperature oxidation.
For little furnace, the drying time is short, the influence of several drying hours is little, but for large furnace, which need to be dried for a long time, you had better open the furnace door to ventilate ()well. you can open the furnace door ajar() with the temperature increment and completely close until the temperature reach 1000ºC above.
Furnace start
If the furnace dry out has been completed or does not need drying, it has to rise its temperature. In order to avoid the over sized electric current impact and cause the electrical equipment overload; 
Please go up the furnace temperature according to the following table.

Small furnace (power100KW)Large furnace(Power 100-500KW)
Furnace temperatureVoltagefurnace temperatureºCVoltage
20-1501/3Operating Voltage200-3001/3Operating Voltage
150-5002/3Operating Voltage300-7002/3Operating Voltage
500-operating temperatureThe Whole-Operating Voltage700-Operating temperatureThe whole-Operating Voltage

It should not take a long time when shifting gears. Otherwise it easily causes the electric current shocking to break the electrical equipment.
Element Replacement
If there is a damaged part found in the process of operation, the first thing you should do is determine its location and get all the combination elements ready. After that, you should separate the wire the damaged element clipped to from the screw ()which is connected to the generatrix(). Then remove the remained refractory wool and pull out the refractory stoppers. Insert the new combination elements into the furnace from its roof. Connect all the wires and get the refractory wool filled, and finally raise the temperature.

MoSi2 elements

MoSi2 elements

Supply ability:1000pieces/month
Min Order: not limit
Package: Package:  Synthetic wooden case padded with foams
We also received OEM service; the package can be designed according to your requirements.
Shipping: By vessel or by plane from any Chinese port, Samples can be delivered by International express.
Our Service:
1. Timely response, 
Timely response to your inquiry, multiple choice recommendations based on your demand, quickly respond mails and provide solutions.
2. Free sample
Sample and trial order is accepted for the quality evaluation.
3. Strict quality control
Arrange production on time and control quality strictly.
4. Shorter delivery time.
Book the earliest vessel or plane to guarantee the delivery time.
5. Professional Services
Provide all the detailed news and pictures from order to delivery;
Offer relative export documents and original certificate if needed;
Warm and considerable after-sale service 

Superb Heater Technology has been focused on the production of high temperature industrial furnace heating elements mosi2 heaters since 1985, which is well-known as one of the leading manufacturers and suppliers of high temperature industrial furnace heating elements mosi2 heaters. In the past years, we owned strong reputation for the high quality, reliable performance and strong durability of our products. Should you are interested, please feel free to contact our factory.