1.The General Description
The silicon carbide heating element is a kind of non-metal high temperature electric heating element. it is made of selected super quality green silicon carbide as main material, which is made into blank, silided under high temperature and re-crystallized. compared with metal electric heating element, this kind of element is characterized by high-applied temperature, anti-oxidization, anti-corrosion, long service life, little deformation ,easy installation and maintenance. Therefore ,it is widely used in various high temperature electric furnaces and other electric heating devices ,such as in the industries of magnet, ceramics, powder metallurgy, glass, metallurgy and machinery etc.
We adopt new production process of cold ends, so our SIC heating elements have excellent specific rate of heat zone resistance and cold end resistance, saving energy, long life ,avoiding over-temperature of cold ends to damage the furnace body .The commercial name of our SIC heating elements is Yuhao Silca heating elements.
2.Physical Property of Elements
2.Physical Property of Elements
The linear expansion coefficient,heat conductivity and specific heat of element will change along with temperature change .And the relational data are the follows:
|
Temperature
(℃)
|
linearexpansioncoefficient(10-6m/℃)
|
Heatconductivity(Kcal/M hr ℃)
|
specific heat(cal.g℃)
|
|
0
|
/
|
/
|
0.148
|
|
300
|
3.8
|
/
|
/
|
|
400
|
/
|
/
|
0.255
|
|
600
|
4.3
|
14-18
|
/
|
|
800
|
/
|
/
|
0.294
|
|
900
|
4.5
|
/
|
/
|
|
1100
|
/
|
12-16
|
/
|
|
1200
|
4.8
|
/
|
0.325
|
|
1300
|
/
|
10-14
|
/
|
|
1500
|
5.2
|
/
|
/
|
|
specific gravity
|
2.6～2.8g/cm3
|
Bend strength
|
>300kg
|
|
Hardness
|
>9MOH’S
|
Tensile strength
|
>150Kg.cm3
|
|
Porosity rate
|
<30%
|
Radiancy
|
0.85
|
3.Electric Property of Sic Heating Elements
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.Below figure shows the relation between furnace temperatures,element temperature and element surface load under the condition that the element radiation is not obstructed.
Recommend surface load
|
Furnace Temp℃
|
1100
|
1200
|
1300
|
1350
|
1400
|
1450
|
|
Surface load of hot zone(W/㎝2)
|
<17
|
<13
|
<9
|
<7
|
<5
|
<4
|