silicon carbide rod type sic heater for ceramics

1.The General Description of silicon carbide heating element

1)production process:made into blank,silicided under high temperature and re-crystallized.

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

3)usage: sic heaters used in various high temperature electric furnaces and other electric heating devices,such as in the industries of magnet,ceramics,metallurgy ,glass,and machinery.

4)Type:we have rod,u,w,h,gun,single spiral,double spiral,dumbbell,door like type silicon carbide heaters.

5)Technical parameter of rod type silicon carbide heating element

2.Electric property of silicon carbide heating element

Sic heating elementshave 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.

3.Accessories of silicon carbide heating element

4.Advices of using silicon carbide heating element

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.

5.Key factors affecting sic heating element life

1)operating temperature

The higher temperature of Yuhao elements,the shrter 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 Yuhao 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 Yuhao elements.

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 Yuhao elements.Thus the surface loading density,the furnace atomosphere 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 Yuhao element 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,silicon carbide 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 resistanc of the heating element.The silica film behaves abnormally by expanding or contracting at around th crystal transformation temperature(1270 celsius).If heating elements temperature goes up and down repeatedly around ths 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.

6.When you place order,pls tell us following data

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

Our company have more than 20 years production experience, specialized in manufacturing high-temperature heating elements with strict quality control system, advanced equipment, strong technique power and complete test facilities. At present, our various products have passed ISO9001:2008 quality system authentication and have been exported to more than 40 countries and regions.

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