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Control of applied temperature and surface load of Songshan Silca heating elements under diffent atmosphere

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Control of applied temperature and surface load of Songshan Silca heating elements under diffent atmosphere

Categories:Technical Support
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Time of issue:2017-08-20 17:43
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(Summary description)

Control of applied temperature and surface load of Songshan Silca heating elements under diffent atmosphere

(Summary description)

Categories:Technical Support
Author:
Origin:
Time of issue:2017-08-20 17:43
Views:

Information

Control of applied temperature and surface load of Songshan Silca heating elements under diffent atmosphere

Atmosphere	Furnace Temp(℃）	Surface Load（W/cm³）	Acting to the element	Solve way
Ammonia	1290	3.8	Acting on SiC to form thus decrease SiO₂ protective film	Active at dew point
CO₂	1450	3.1	Attack SiC	Protecting by quartz tube
18%CO	1500	4.0	No action
20%CO	1370	3.8	Adsorbing C grains to act on SiO₂protective film
Halogen	704	3.8	Attacking SiC and decreasing SiO₂protective film	Protecting by quartz tube
Hydrocarbon	1310	3.1	Adsorbing C grains causes hot pollution	Fill with enough air
Hydrogen	1290	3.1	Acting on SiC to form thus decrease SiO₂protective film	Active at dew point
Methane	1370	3.1	Adsorbing C grains causes hot pollution
N	1370	3.1	Acting with SiC forms SiN insulating layer
Na	1310	3.8	Attack SiC	Protecting by quartz tube
SO₂	1310	3.8	Attack SiC	Protecting by quartz tube
Vacuum	1204	3.8
Oxygen	1310	3.8	SiC is oxided
Water（different contents）	1090~1370	3.1~3.6	Acting on SiC forms hydtate of Silicon

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 isn’t obstructed.