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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

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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 Starbar very slow aging characteristics and high strength
Grade2  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..

          The spiral Starbars are made of special high-density reaction-bonded silicon carbide. A spiral slot in the hot zone reduces the cross sectional area. The helical cut in the hot section increases the length and reduces the cross-section of the current path, forming a high resistance area, where most of the resistive heat is dissipated. This provides the electrical resistance ratio to make the ends cool and the hot zone hot. Special cold ends may be welded to further enhance the resistance ratio. To provide a low resistance contact surface the extremities are metallized with aluminum. The electrical connections are made with flat aluminum braids and spring clamps. The terminal ends of the SG element are normally plugged.
       SG SIC heating elements are described by giving the overall length, the heating section length, and the diameter. As an example, SG36 x 14 x 1 is a spiral element 36" long with a 14" hot zone and 1" in diameter
      SG SICheating  elements are available in a wide range of standard sizes, and non standard sizes will be considered.
SG are our highest performance silicon carbide (SiC) heating elements, designed to exceed the requirements of today’s most demanding high-temperature processes.

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Item#

 Item Name

Dimater

Maximum Heating Length

Maximum Overall Length

Maximum Load Tube OD

QS  ID

SG-3/8-10

Type Se, Silicon Carbide Sprial Heating Element

3/8 Inch
     10 mm

10 Inch
     250 mm

30 Inch
     762 mm

1/8 Inch
     3 mm

3/16 Inch
     5 mm

SG-1/2-13

Type Se, Silicon Carbide Sprial Heating Element

1/2 Inch
     13 mm

12 Inch
     305 mm

32 Inch
     73 7mm

1/8 Inch
     3 mm

3/16 Inch
     5 mm

SG-5/8-16

Type Se, Silicon Carbide Sprial Heating Element

5/8 Inch
     16 mm

14 Inch
     355 mm

34 Inch
     864 mm

1/4 Inch
     6 mm

5/16 Inch
     5 mm

SG-3/4-19

Type Se, Silicon Carbide Sprial Heating Element

3/4 Inch
     19 mm

22 Inch
     555 mm

42 Inch
     1067 mm

5/16 Inch
     8 mm

3/8 Inch
     95 mm

SG-7/8-22

Type Se, Silicon Carbide Sprial Heating Element

7/8 Inch
     22 mm

26 Inch
     650 mm

50 Inch
     1270 mm

3/8 Inch
     9 mm

1/2 Inch
     12.5 mm

SG-1-25

Type Se, Silicon Carbide Sprial Heating Element

1/1 Inch
     25 mm

30 Inch
     760 mm

61 Inch
     1549 mm

1/2 Inch
     13 mm

9/16 Inch
     14 mm

SG-1-1/4-32

Type Se, Silicon Carbide Sprial Heating Element

1-1/4 Inch
     32 mm

40 Inch
     1015 mm

71 Inch
     1803 mm

9/16 Inch
     14 mm

11/16 Inch
     17mm

SG-1-3/8-35

Type Se, Silicon Carbide Sprial Heating Element

1-3/8 Inch
     35 mm

40 Inch
     1015 mm

71 Inch
     1803 mm

11/16 Inch
     17 mm

13/16 Inch
     21 mm

SG-1-1/2-38

Type Se, Silicon Carbide Sprial Heating Element

1-1/2 Inch
     38 mm

40 Inch
     1015 mm

71 Inch
     1803 mm

13/16 Inch
     21 mm

15/16 Inch
     24 mm

SG-1-3/4-45

Type Se, Silicon Carbide Sprial Heating Element

1-3/4 Inch
     45 mm

48 Inch
     1220 mm

79 Inch
     2007 mm

15/16 Inch
     24 mm

1-1/16 Inch
     27 mm

SG-2-1/8-54

Type Se, Silicon Carbide Sprial Heating Element

2-1/8 Inch
     54 mm

52 Inch
     1320 mm

85 Inch
     2159 mm

1-3/16 Inch
     30 mm

1-15/16 Inch
     33 mm

SG-2-3/4-70

Type Se, Silicon Carbide Sprial Heating Element

2-3/4 Inch
     70mm

60 Inch
     1525 mm

93 Inch
     2362 mm

1-13/16 Inch
     46 mm

1-15/16 Inch
     49 mm

hysical  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

1150℃

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 lithium ion 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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