6-13

Fig.6-13 Effect of reducing the temperature of the fitting on the outlet side by optimizing the dimensions of the furnace tube

(a) In the unmodified core tube (0.6 m), the temperature at the outlet fitting exceeded the usable temperature (515 ℃) of the fluorine grease. (b) In the improved core tube (0.8 m), the temperature can be reduced to room temperature by moving the outlet fitting away from the tubular furnace.

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