The spiral silicon carbide are made of special high-density reaction-bonded silicon carbide. A spiral slot in the hot zone reduces the cross sectional area. 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 element are normally plugged.This cilicion carbide is described by giving the overall length, the heating section length, and the diameter.

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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:

•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

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):