Type M Silicon Carbide Heating Elements
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.
Product Application
Elements are used in a wide variety of furnace applications, from small labora- tory furnaces to large industrial heating processes, in different atmospheres and temperature ranges.
In many applications including: glass, ceramics, electronics and metal industries, and also for research and development.
Item Description
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 QS M TYPE element is a heating element that has two cold ends, welded at right angles to the opposite ends of the hot section. The maximum recommended furnace temperature is 1425oC . The element is manufactured of high density recrystallized silico carbide.? ?
? ? ?The two cold ends are low resistance silicon carbide. The diameters available range from 13 to 54mm and hot zone lengths up to 1500mm and cold ends up to 480mm long. ? ? ?The QS M TYPE element is ideal for launders where terminal connections are on the top of the furnace.?
? ? ?The RA element has support holes in the cold end so the element can be installed with the cold ends through the roof. Cotter pins and washers are included with each element.
Other sizes available on request? ?
?All resistance values are +/-20%. Resistance values are measured at approximately 1071oC (1960oF). Special high-resistance elements are also availableEasy to install through roof? ?
?Ideal for lift-off roof arrangements. All terminal connec- tions are on the top surface, and no access to the sides is required.? ? ?Ideal for narrow channels, launders and feeders. QS M PYTE elements can be fitted along the length of the unit, instead of across the width so fewer elements are required, and all terminal connections are limited to the roof, leaving the sides free for access.
Ideal for wide roofs and walls? ? ? QS M TYPE elements can be arranged in zones to improve temperature uniformity inside the furnace.Conventional rod elements fit across the entire width or height of the furnace, and separate control zones are not possible.? ? ? QS M TYPE? elements, the interior surfaces of the furnace can be divided into multiple control zones, for improved temperature uniformity and control, and improved yield of the finished products.
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
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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: ? ? ?
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 (?A): ? ? ?
Hot zone length, mm(L): ? ? ?
Cold? end length,mm(L) ? ?
?Overall length, mm? (L): ? ? ?
Nominal resistance,( Ω):
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