Heating Filaments

CVD processes encompass a great number of materials, process environments, and process chemistries.  The environment can include inert, reducing, oxidizing, or other atmospheres; the temperatures can vary greatly from room temperatures to about 2400 deg C; temperature can vary greatly from low pressures (<10^-6 atm to greater than a few atmospheres), the process chemically can also create acids and bases.  Plasma and associated excited and reactive species may also be present.  Thus depending on the materials and process parameters, a very wide range of heating methods may be called upon.  SMI has implemented a great range of heating approaches including filaments Graphite, Tungster, Hastelloy, MoS2, SiC, lamps, induction, and even direct current resistance heating of the material as in a tape.