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heating

PROCESSES


Annealing

Bonding

Brazing

Forging

Fusing

Hardening

Heat Staking

Heat Setting

Pre-Tinning

Susceptor Heating

Pre-Heating for Welding

Heating a Graphite Susceptor in a Bell Jar

drawomg of graphite boat

Research Objective

To heat a graphite susceptor to 1200°C through the use of a helical inductor with a minimum inside diameter of 4”. Time to temperature and temperature gradients throughout the sample are of special concern.

Parts & Materials Description

Graphite susceptor “boat” measuring 4” wide, 2.5” long, 0.5” thick

Temperature Required

1200°C

Induction Heating Equipment

Bell jar protective atmosphere heating system with 7.5 kW induction supply, IR optical pyrometer, specially designed inductor (coil)

Operating Frequency

123 kHz

Heating Procedure

A specially-designed seven-turn helical inductor was used to provide optimal heating efficiency. An optical pyrometer was utilized to ensure accurate temperature measurement. Initial tests were conducted to establish a heating profile and determine time to temperature. RF power was applied for 7 minutes. The susceptor reached a temperature of 1200°C with a temperature gradient of 55°C across the boat.

Conclusion

Successful, even heating was achieved by heating the graphite susceptor with the 7.5 kW power supply in a protective atmosphere.


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