Atmosphere Chamber Furnace Molybdenum Disilicide Heater Rod 1600C
Electric Heating
Introduction of Molybdenum Disilicide Heater Rod
1. Mosi2 heating element is a kind of resistance heating element
with high temperature resistance, oxidation resistance and low
aging based on molybdenum disilicide.When used in high temperature
oxidation atmosphere, a layer of bright and compact quartz (SiO2)
glass film is formed on the surface, which can protect the inner
layer of si-mo rod from oxidation, so the element of si-mo rod has
unique high temperature oxidation resistance.
2. Under the oxidizing atmosphere, the maximum operating
temperature is 1800, the resistance of the heating element of
silicon molybdenum rod increases rapidly with the temperature
increasing, and the resistance value is stable when the temperature
is constant.Under normal conditions, the resistance of elements
does not change with the service time, so the new and old elements
can be mixed.
3.According to the structure, working atmosphere and temperature of
the heating equipment, the correct selection of the surface load of
the heating element is the key to the service life of the element.
Please tell us the following data of molybdenum disilicide MoSi2
rod heating element when send enquiry to us :
d = the diameter of hot zone ?
c = the diameter of cold zone ?
Le = the length of hot zone ?
Lu = the length of cold zone ?
a=Shank spacing
How many pcs ?
Molybdenum Disilicide Heater for electronics
1) Vertically hanging
Under normal temperature, MoSi2 heater 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.
Physcial property of molybdenum disilicide heater:
| Density | Bending Strength | Hardness | Apparent Porosity | Water Absorption | Elongation | Fracture Toughness | Compressive Strength |
| 5.8g/cm3 | 350Mpa | 12.0Gpa | ±2% | 0 | 4% | 4.5Mpa.m1/2 | 650Mpa |
MoSi2 heater use and maintenance
1. MoSi2 heater 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 heater continuously operate in an oxidation
atmosphere, the surface temperature of 1700 type should not exceed
1700 ° C,1800-type should not over 1800 ℃ and for intermittent
use,1700 type-element should not over 1650 ° C,1800type-element
cannot exceed 1750 ℃.
Furnace dryness
New or old furnace not used for a long time needs to be dried
before using. Generally, the drying temperature is 100-200℃.
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 1000℃ above.
