China Silicon Molybdenum Electric Heating Element Rod for Furnace

Silicon molybdenum (MoSi2) electric heating element rod for furnace
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)14001500160016501700Surface 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) 1700type1800typeAir17001800N2 16001700He Ar Ne Argon, Helium16001700Dry Hydrogen(dew point) -80ºC11501150Wet Hydrogen(Dew point) -20ºC14501450mixed gas(e . g . 10%CO2, 50%CO, 15% H2)16001700mixed gas(e . g . 40%CO2 , 20%CO)14001450Cracked 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.

Application:
Itemnamedistinction criterionspecificationUsing rangeHeating elements1700 typeElement operating temperature 1700ºC is acceptableLe Φ
6-12W type/U type/L type/all kinds of hetero type / stripe shapehigh temperature electric resistance furnace1800 typeElement operating temperature 1800ºC is acceptable1800J typeElement operating temperature≥1800ºCLe Φ
3-12W typeSpecial,high temperature and high-power electric resistance furnace1800T typeElement operating temperature≤1800ºCLe Φ
3-12W type U typeNot 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 temperatureºCVoltage20-1501/3Operating Voltage200-3001/3Operating Voltage150-5002/3Operating Voltage300-7002/3Operating Voltage500-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.

Supply ability:1000pieces/month
Min Order: not limit
Port: Qingdao


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. Sample evaluation
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
Company Information
DKJL refractories exporting company is one of the most professional suppliers of refractories in China. Our main products are refractory and thermal insulation materials, heating elements and industrial ceramics. They are available in various sizes and shapes. Our products enjoy a good reputation for their excellent quality and service in domestic and international markets.


FAQ:
1. How can I get your prompt quotation?
We can give you reply with quotation quickly if you kindly send the inquiry with following factors:
1) Cold zone length(Lu, mm) and diameter;
2) Hot zone length (Le, mm) and diameter;
3) Shank Spacing(A, mm): Length of the connector (bridge length);
4) Total length;
5) Mosi2 working temperature: 1700 or 1800 Celsius;
6) Power;
7) Quantity
We would be very appreciated if you can provide drawings.

2.What's the MOQ of the order?
No limit, we can offer the best suggestions and solutions according to your condition.

3. Which payment terms can you accept?
T/T,LC,Western Union,moneygram are available for us.

4. After an order is placed, when to deliver?
15-25days after confirming the order.
5. Does your company accept customization?
We accept OEM service.
6. How to solve the quality problems?
If the products don't conform to customer's samples or have quality problems, our company will be responsible to make compensation for it based on enough evidence.

7. What is the HS code?
The HS code is 84169000

8. How can I contact you?