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General discription
     Silicon carbide is a resistance type heating element.and made from high density  reaction-bonded silicon carbide  or high purity recrystallized silicon carbide , that are extruded in the form of rods or tubes, before being bonded together by a process of re  crystallization, at temperatures of over 2500°C (4530°F). The firing process ensures the creation of rods with strong uniform bonds between adjacent grains, and the particle size distribution is closely controlled to ensure optimum density and resistance to the process atmosphere.
      Heating elements for element temperatures up to 1625°C (2927°F), available in a wide variety of standard sizes and geometries, or in customized designs to meet the specific needs of various processes and equipment. heating elements are capable of high power output, and may be mounted either vertically or horizontally. no special supports are required
      Grade 1 QS1

      SiC heating Elements suitable for most applications in which silicon carbide elements are used. heating elements feature hot zones of high purity recrystallized silicon carbide, optimized for resistance to oxidation and common process gases. Available in rod or multi-leg designs. high density -- approximately 2.52 g/cm3  or 2.7g/cm3 to 2.8 g/cm3.This gives the heating elements very slow aging characteristics and high strength
      Grade 2 QS2

       SiC heating elements designed for the most challenging applications where conventional silicon carbide elements are unsuitable.  SiC heating elements feature hot zones of high density, low permeability, reaction-bonded silicon carbide, which is highly resistant to oxidation, and to chemical attack by process volatiles and reactive atmospheres. At 2.7 g/cm3, this high-density low-porosity element  has an extremely slow aging characteristic.

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Item#

Daimeter

maximum   overall length

Hot Zone(Electrical   Resistance)

Cold End   (Electrical Resistance)

DH&DL

10mm

660mm

0.01372   Ohms/mm

0.000686   Ohms/mm

DH&DL

11mm

915mm

0.01009   Ohms/mm

0.000505   Ohms/mm

DH&DL

13mm

1090mm

0.00773   Ohms/mm

0.000387   Ohms/mm

DH&DL

16mm

1250mm

0.00497   Ohms/mm

0.000248   Ohms/mm

DH&DL

19mm

1575mm

0.00341   Ohms/mm

0.00017  Ohms/mm

DH&DL

25mm

1900mm

0.00197   Ohms/mm

0.000098   Ohms/mm

DH&DL

32mm

2210mm

0.00134   Ohms/mm

0.000067   Ohms/mm

DH&DL

35mm

2290mm

0.00106   Ohms/mm

0.000053   Ohms/mm

DH&DL

38mm

2340mm

0.00092   Ohms/mm

0.000046   Ohms/mm

DH&DL

45mm

2670mm

0.00065   Ohms/mm

0.000032   Ohms/mm

DH&DL

54mm

3300mm

0.00059   Ohms/mm

0.00003  Ohms/mm

DH&DL

70mm

3300mm

0.007298   Ohms/mm

0.00052  Ohms/mm


Physical  properties

Bulk Density

2.5—2,8g/℃m3

Porosity

20%

Thermal  Conductivity

14-19w/m ℃

Rupture Strength

50Mpa(25℃)

Specifi Heat

1.okj/℃(25-1300℃)

Coefficient of Thermal Expansion

4.5x10-6(1000℃

OPERATING TEMPERATURES

SLIOCON CARBIDE HEATING ELEMENT USE BY ATMOSPHERE

ATMOSPHERES

TEMPERATURE LIMIT

MXXIMUM LOADING W/in2

MXXIMUM LOADING W/cm2

EFFECT

CLEAN DRY AIR

1550℃

Maximum

Maximum

One piece Sic element can be operated at furnace control temperatures up to 1600ºC. (Maximum element temperature is 1625ºC). The three-piece Sic element is limited to 1427ºC.

HYDROGEN
     DP+75°F
     DP-60°F

    1300℃
     1300℃
     1093℃

     30
     30
     30

     5
     5
     5

An atmosphere which contains any percentage of hydrogen whatsoever will react with silicon carbide if the temperature exceeds 1300ºC.

AMMONIA

1300℃

30

5

Reduces silica film, Frorm CH4 from Sic

NITROGEN

1370℃

30

5

Form insulating Silicon Nitrides

PURE OXYGEN

1315℃

25

4

Faster oxidization than in air. Use LMA infusion glaze cotated starbar elements, or type TW, SE,SER or SEU

CO2

1500℃

25

4

No effect,may deposit Carbon

CO

1540℃

25

4

No effect

ARGON/HELIUM

1700℃

Maximum

Maximum

No detrimental effect

WATER DP 60°F
                    50°F
          0        °F
         -50        °F

1095℃
     1200℃
     1370℃
     1540℃

30
     45
     40
     45

5
     5.5
     6.5
     7

Reacts with Sic to form Silicon Hydrates ,Use LMA infusion glaze coated Starbar elements, or type TW,SE,SER,or SEU.

HALOGENS

700℃

25

4

Attacks Sic and SiO2 reducing

HYDROCARBONS

1315℃

20

3

Hot spotting from C pick-up

METHANE

1315℃

20

3

Hot spotting from C pick-up

DRY EXOTHERMIC GAS

1400℃

Maximum

Maximum

Dependent on composition

DRY ENDOTHERMIC GAS

1250℃

Maximum

Maximum

Dependent on composition

VACUUM

1205℃

25

4

To 7 Microns -Below vaporizes Sic. Short term use only

S and SO2

1315℃

25

4

Attack Sic

For atmospheres containing water vapor, alkali metal vapors, flux vapors, or oxygen enrichment, we recommend the use of QS3 glaze coated elements
Glazes and coatings
     Special glazes and surface treatments have been developed which can extend element life in various operating conditions, particularly where chemical attack is a problem. Details of these will be provided on request.
     QS offers a special coating for certain severe atmosphere applications.

     QS1 Coating

     This coating consists of a complex silicate glass specially formulated to provide a high degree of protection against chemical attack in atmospheres containing water vapor, alkaline metal vapors, flux vapors and in applications that utilize oxygen enrichment, including; non-ferrous metal melting and holding, glass melting and refining, brazing, sintering of powdered metal components, and pre-sintering of powders for lithiumion battery cells.

      QS2 Coating 

      This coating is a silicon carbide/silica composite. It is applied in 2 parts, an organic based pretreatment followed by a mix of silicon carbide and colloidal silica. The coating is cured to provide an adherent coating that covers the outside surface of the heating element. The organic portion burns away during the cure step to leave SiC and SiO2. This coating acts as a physical barrier to chemical attack on the heating elements.

      QS3 Coating

      This coating is a zirconia/silica based coating. When applied to the hot zone, this coating acts as a physical barrier to attack. When applied to the cold ends, the coating prevents the elements from sticking to the furnace refractor

SERVICE LIFE
       All silicon carbide elements increase in resistance during their life in operation, This characteristic of increasing in resistance is called aging. Aging is a function of the following:
      •Furnace temperature
      •Element surface loading in W/cm2
      •Atmosphere surrounding the elements
      •Mode of operation – continuous or intermittent
      •Operating practices and power control methods used
      •Operating and maintenance technique
      As a general guide, QS SIC elements may increase in resistance at a rate of about 5 – 6% per 1000 hours operating continuously in clean air at a temperature of 1400°C ( and at about 3% per 1000 hours use at 1000°C . It should be noted that small changes in operating conditions can alter these rates considerably
INTERCHANGEABILITY 

     QS  SIC are premier grade high performance silicon carbide elements, and we are the only high quality silicon carbide heating elements manufactured in theCHINA. Elements can also be manufactured in special sizes and resistance values to replace elements supplied by other manufacturers in Asia and Europe. It is important to provide the nominal electrical resistance when ordering Sic elements.
EASE OF REPLACEMENT 

      SIC element can be replaced while the furnace is at operating temperature. The power to the elements being changed should be shut off, the spring clips and aluminum braid released, and the old SIC removed. The new SIC should be inserted smoothly through the hot furnace with sufficient speed to insure that the aluminum is not melted off the terminal end but not so fast as to cause thermal shock
AVAILABILITY

       SIC can be shipped  from stock, or two to three weeks after receipt of an order. In an emergency we may be able to produce more quickly.
CUSTOM CONFIGURATIONS 

       Special sizes and shapes are available. Cold ends can be different lengths. This, for example, would be applicable for furnaces with arched roofs that require longer cold ends through the roof and shorter through the floor. Another modification is a multiple-temperature hot zone. This, for example, would be helpful to get additional heat energy into the lower, more densely loaded tunnel kiln. While this special modified hot zone may not create a specific temperature differential, it does offer a convenient way to get more or less heat energy.
SUPERIOR PERFORMANCE

       SIC elements will give you superior performance due to their high density -- approximately 2.52 g/cm3 .or 2.7 g/cm3to2.8 g/cm3 ,This gives the SIC elements very slow aging characteristics and high strength.
Ordering
       The minimum information required when ordering QS SIC elements is as   follows:
       Element type:
       Diameter, mm (ØA):
       Hot zone length, mm(L):
       Overall length, mm  (L):
       Nominal resistance,( Ω):

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Telephone:+86-371-60995122
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E-mail:tab@qs–heatingelements.com
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