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Best quality SiC Heating Elements Silicon Carbide heater, ISO and CE certificate, Long life 6--10 months, max temperature 1600 C - details see: https://www.machineto.com/float-glass-w-type-sic-heating-elements-silicon-carbide-heater-10245586

China STA W Type multi legs silicon carbide heater is high quality sic heating elements used in furnace and glass tin bath.

STA, a experience of more than 3 decade in manufacturing of Sic heating elements silicon carbide heater, STA occupies a majority share in this range.

Sic heating elements silicon carbide heater 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,silicide under high temperature and re-crystallized. Max temperature 1600 deg C.

Production process: made into blank, silicided under high temperature and re-crystallized.

Character: high-applied temperature anti-oxidization ,anti-corrosion ,long service life ,little deformation, easy installation and maintenance.

Usage: sic heating elements silicon carbide heater used in various high temperature electric furnaces and other electric heating devices, such as in the industries of magnet, ceramics, metallurgy ,glass, and machinery.

Type:we have rod ,u, w, h, gun, single spiral, double spiral, dumbbell, door like type sic heating elements silicon carbide heater.

Sic heating elements silicon carbide heater have rather large specific resistance. When it is heated in air and the surface temperature of the hot zone reaches 1050°C,it's resistance rate is 600-1400mm2/mm and its resistance value changes as the temperature rises which is negative value from room-temperature to 800 °C and is postive value nature over 800 °C .

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. The figure shows the relation between furnace temperatures, element temperature and element surface load under the condition that the element radiation is not obstructed.

We are the leading manufacturer of SiC products in China since 1971, Especilly in Sic heating elements silicon carbide heater.

size and resistance
(d)	(I)	(L1)	(L)	(ohms)	(d)	(I)	(L1)	(L)	(ohms)
8	100-300	60-200	240-700	2.1-7.2	30	300-2000	250-800	800-3600	0.4-4.0
12	100-400	100-350	300-1100	0.8-6.0	35	400-2000	250-800	900-3600	0.5-3.4
14	100-500	150-350	400-1200	0.8-5.6	40	500-2700	250-800	1000-4300	0.5-3.0
16	200-600	200-350	600-1300	0.8-4.4	45	500-3000	250-750	1000-4500	0.3-2.5
18	200-800	200-400	600-1600	0.7-5.8	50	600-2500	300-750	1200-4000	0.3-2.5
20	200-800	250-600	700-2000	0.6-5.0	54	600-2500	300-750	1200-4000	0.3-2.5
25	200-1200	250-700	700-2600	0.6-4.5

Sic heating elements silicon carbide heater size:

1)Outer diameter(OD):mm

2)Length of Hot zone(HZ):mm

3)Length of Cold end(CZ):mm

4)Length of Overall(OL):mm

5)Shank spacing(A):mm

6)Resistance(at 1050C+/-50C):ohms

Advices of using sic heating elements silicon carbide heater

1) In order to keep furnace temperature and the charges uniform of each element, before installation resistance distribution must be carried.

2) As the element is very brittle, be careful while install and maintain to avoid any damage.

3) When start to operate the furnace, raise voltage slowly and gradually, never give full load at one time.

Physical properties of sic heating elements silicon carbide heater

specific gravity	2.6~2.8g/cm³	bend strength	>300kg
hardness	>9 MOH′S	Tensile strength	>150kg/cm³
porosity rate	<30%	radiancy	0.85

Recommend surface load of sic heating elements silicon carbide heater

Furnace Temp (°c )	1100	1200	1300	1350	1400	1450
Surface load of hot zone (W/cm²)	<17	<13	<9	<7	<5	<4

Key factors affecting sic heating elements silicon carbide heater life

1) Operating temperature

The higher temperature of STA sic heating elements silicon carbide heater, the shorter the life. Oxidation accelerates and the life shortens especially when the furnace chamber temperature exceeds 1600 celsius. Therefore, it is recommended the surface temperature of STA shall be kept as low as possible when in use. Namely, it is necessary to minimize the difference in temperature between inside the furnace chamber and the STA sic heating elements silicon carbide heater.

2) Surface loading

The surface loading density is expressed in terms of the electric power applied per square centimeter of the heating surface. As experience proves that the larger the surface loading density(electric power)of the element, the higher the surface temperature, but the higher the temperature, the shorter of the life of STA sic heating elements silicon carbide heater. Thus the surface loading density, the furnace atmosphere and temperature are in proportion to the element's aging speed ad inversely proportional to the element's service life.

3) Type of operation-continuous or intermittent

Comparing STA sic heating elements silicon carbide heater life between the case where it is continuously operated and in the case where it is intermittently operated, it is maximized in the former case. During operation, sic heating element oxidize at the surface, where a silica film is formed. With long, continued use this film gradually thickens, resulting in an increase in the resistance of the heating element. The silica film behaves abnormally by expanding or contracting at around the crystal transformation temperature(1270 celsius).If heating elements temperature goes up and down repeatedly around the temperature by intermittent use, the accumulated film will be destoryed repeatedly and oxidiation will be promoted. Therefore,when the temperature of the furnace chamber goes down to room temperature due to a power failure etc., the resistance may increase rapidly.