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1.mosi2 heating element, 2.Straight,U,W,L type, 3.Dia(mm):3/6,4/7,4/9,6/12,9/18,10/18, 4.mosi2 raw material, 5.ISO certificated - details see: https://www.machineto.com/1800c-u-type-molybdenum-disilicide-mosi2-heating-element-10247251

1800c U type molybdenum disilicide mosi2 heating element

1.The General Description of molybdenum disilicide(mosi2) heating element

MoSi2 heaters are resistive heating elements based on molybdenum disilicide. The molybdenum disilicide heating elements prevents the inner core from oxidation by forming a compact quartz glass coating at the surface under high temperature. The temperature generated by MoSi2 goes as high as 1700~1800°C in oxidation atmosphere.

They can be widely used in such applications as sintering and heat treatment on electronic ceramics, structural ceramics, magnetic materials, flameproof materials, glass, metallurgy, etc. The resistance of the heating elements is independent on their mission time. The MoSi2 heating elements hardly age, which allows the mixed use of new and old packages.

We make U shape, W shape, Straight shape (X shape) and bend shape (L shape), etc. The dimension ranges from 3/6, 4/9, 5/10, 6/10, 6/12, 6/14, 7/14, 8/16, 9/18 to 12/24mm. Special request from customers is welcome.

The Yuhao MoSi2 Heating Elements belong to the brittleness material so that they are easy to rupture at the normal temperature, which brings some difficulty to transport and install, but it may be avoided if they were installed and used correctly.

2. Physical and Chemical Properties of Molybdenum Disilicide(mosi2) heaters

1) Physical property

Volume density	5.5~5.6kg/cm3	Bend strength	515~25kg/cm2
Vickers-hardness	(HV)570kg/mm2	Porosity rate	7.4%
Water absorption	1.2%	Hot extensibility	4%

2)Recommend Surface load

Furnace Temp (C )	1400	1500	1600	1650	1700
Surface load of hot zone(w/cm2)	<18	<15	<12	<10	<8

3)Chemistry property

MoSi₂heating element is used in the high temperature under oxidizing atmosphere. It will form the SiO₂film which can keep the element from being melted. When the temperature of element is more than 1700°C,the MoSi₂heating element must not be used in the temperature between 400°C and 700°C for a long time; otherwise the element will be cremated under the strong oxidizing function in the low temperature.

It should be pointed out that element cannot be used for rather long time in 400-700°C,or it will be powdered owing to the strong oxidizing action in low temperature.

3. Electric Property of Molybdenum Disilicide(Mosi2) heating Element

1) Resistance property

The resistivity of element rapidly rises as the temperature rises,under normal operating conditions ,generally the element resistance doesn't change with the service time changing. So the old and new elements can be used mixed.

2) Surface load

The key factor to the optimum service life of the element is to select the surface load of the element correctly according to the furnace construction, atmosphere and temperature. Right figure shows the relation between the furnace and the element surface load under the condition that the element radiation isn't obstructed. The shadow part in the figure shows the surface load-temperature range in common use. The figure still shows the reference current.

4.The using temperature under the different atmosphere:

Atmosphere	The Maximum Using Temperature of Element
	1700 Grade	1800 Grade
NO2,CO2,O2,Air	1700°C	1800°C
He,Ar,Ne	1650°C	1750°C
SO2	1600°C	1700°C
CO,H2	1500°C	1600°C
WetH2	1400°C	1500°C
DryH2	1350°C	1450°C

5. Installation of molybdenum disilicide(mosi2) heating elements

1) Vertically hanging

Under normal temperature, MoSi2 element is very brittleness, while under high temperature it is plasticity. So, the better way for installation if the U Shape element is to hang it vertically, to the furnace top through the support clamping chucks. The aim of such way is to avoid putting the mechanical stress directly to the element heat-generating end, or 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 that the element it 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.

6.Accessories of mosi2 heating element

7. When you place order,pls kindly tell us the following things

Diameter of Hot Zone (D1):mm

Diameter of Cold End (D2):mm

Length of Hot Zone (Le):mm

Length of Cold End (Lu):mm

Shank spacing (A):mm

8.About our company

Our company have more than 20 years production experience, specialized in manufacturing high-temperature heating elements with strict quality control system, advanced equipment, strong technique power and complete test facilities. At present, our various products have passed ISO9001:2008 quality system authentication and have been exported to more than 40 countries and regions.

Welcome to visit our factory!