Note: Stainless Steel Housing
Objective:
To heat a stainless steel housing to 1875 °F in order to fuse a piece of R6 glass to the inside of the housing. Then the housing is to be heated to 1475 °F to reflow the surface of the glass to produce a quality finished surface. Oxidation of the stainless steel part is to be prevented by performing the heating within a quartz tube having an inert atmosphere.
End Product:
Stainless Steel Housing
Equipment:
Ambrell 1kW induction heating system including one remote heat station containing one 1.0 µF capacitor, and a two-turn helical coil fabricated from 3/16" tubing with a 1 1/8" OD and 5/8" high.
Materials:
304 stainless steel bushing measuring 0.450" OD and 0.170" thick.
R6 glass insert measuring 0.191" OD and 0.155" thick.
Temperature:
1875 °F to fuse the glass into the bushing. 1475 °F to produce a quality finished piece.
Frequency:
368 kHz
Testing:
Through laboratory research, the Ambrell 1kW induction heating system along with a two-turn helical coil were found to produce the following results:
♦ 1875 °F was reached in 5 seconds as shown by an IR optical pyrometer.
♦ Horizontal heating of the bushing to 1875 °F produced a quality glass-to-metal seal
♦ Vertical heating of the bushing to 1475 °F produced an optically clear glass
♦ No oxidation was observed as a result of using an inert atmosphere of 95% Nitrogen/5% Hydrogen.
Benefits:
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