High Purity Double Thread SiC Heating Element Oxidation Resistance
Long Service Life
Silicon Carbide Heating ElementDescription
Silicon Carbide Heating Element can be installed and replaced while
the tin bath is operation. The heaters can be installed through the
side-seal, or through the side of the bath roof, and are commonly
used to extend campaign lives, where conventional elements in the
side zones have been broken, and insufficient power is available.
Silicon Carbide Heating Element Advantages
High purity raw materials;
High structural density;
Maximum temperature being up to 1500℃ (2732°F);
Easy to be installed and replaced.
Types and Applications of Silicon Carbide Heating Element
1. SW (Standard)
SW Silicon Carbides are used in applications ranging in temperature
from 600°C up to 1400°C in both air and controlled atmospheres.
Although the type of atmosphere used will determine the maximum
recommended element temperature. This kind of silicon carbide
elements can be mounted either vertically or horizontally.
U shape Silicon Carbide is consists of two silicon carbide rod with
same diameter. Each rod has both hot zone and cold end with
identical resistance. Two rods are connected by the low resistance
SiC. Also the connector could be used as holder according to
3-phase elements are available in 2 different types: SGC
These elements are self-bonded silicon carbide formed by
re-crystallization of silicon carbide at high temperature. It
consists of three high-purity silicon carbide rods connected at one
end by a silicon carbide crossbar. SGC elements are designed for
vertical installation in standard float glass bathes and SGD
elements for horizontal installation. They can be connected
directly on three-phase power supply and is a one-side terminal
type which permits drawing out the terminals from the roof of the
4. Single Spiral Silicon Carbide and Double Spiral Silicon Carbide:
They are made from silicon Carbide powder, and have two shapes:
single and double sprial silicon carbide heating element. They are
widely used in all kinds of kilns and furnaces.
Physical property of SIC heating element
|specific gravity||2.6~2.8g/cm³||bend strength||>300kg|
Recommended surface load and Influences to Surfaces of the Elements in Different Operating
|atmosphere||Furnace Temperature(°C)||Surface Load(W/cm2)||The influence on the Rod|
|Ammonia||1290||3.8||The action on SiC produces methane and destroys the protection film
|Carbon dioxide||1450||3.1||Corrode SiC|
|Carbon monoxide||1370||3.8||Absorb carbon powder and influence the protection film of SiO2|
|Halogen||704||3.8||Corrode SiC and destroy the protection film of SiO2|
|Hydrogen||1290||3.1||The action on SiC produces methane and destroys the protection film
|Nitrogen||1370||3.1||The action on SiC produces insulating layer of silicon nitride|
|silicon dioxide||1310||3.8||Corrode SiC|
|Water-vapor||1090-1370||3.1-3.6||The action on SiC produces hydrate of silicon|
|Hydrocarbon||1370||3.1||Absorb carbon powder resulted in Hot pollution|
Notice for using and installing:
1. Heater should be protected against damp during storing or
installing to ensure the performance of the heater.
2. In order to be sure of well-distributed lod of each and groups,
heater should be divided before assembling. The tolerance of the
resistance of each one cannot exceed by 10% each other.
3. Heater is hard and brittle, please be careful when assembling
and maintaining so as to avoid damage.
4. When operating the electric furnace at the beginning, the
voltage should be increased slowly and cannot be fully loaded at
once. Otherwise the larger current will be resulted in the damage
5. When heater is damaged and need to be changed, the resistance of
new one should follow the increasing resistance. If many are
damaged or resistance increased too much, heater should be changed.