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Electronics-World-1959-05

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1 THE operator holding a gold ring into a fixture for a second then wiping it quickly is actually brazing the ring. Her hands do not get burned, there is no flame, yet each ring she brazes comes out perfect, without discoloration and without having to be cooled. The secret -electronics does the heating! In the manufacture of transistors and diodes, silicon is grown into large single crystals at a heat of 1400° centigrade. This is done in a vacuum or in a controlled atmosphere and the temperature must be maintained within ±.25 °. Again electronic heating does the job. In many other applications such as hardening, tempering, soldering, etc., the heat is generated without fire, without sparks, without heating up the air or the surrounding tools. Only the point where the heat is needed gets hot, quickly and at a controlled temperature. As many of our readers know, induction heating is employed widely in research and production in the electronics industry. This is especially true in the component manufacturing field where tubes, transistors, diodes, capacitors, and transformers are often brazed, welded, or soldered into their containers. In addition to the electronics industry, induction heating has found wide application in all branches N D CT of metal working and allied industries. It would be impossible to describe, or even mention, all of the possible applications of induction heating. Mentioned below are a few of the more common applications where electronic heating takes the place of the torch or the smithy. An example of one application of v.h.f. energy is the apparatus shown in Fig. 2 which is used for zone -refining of ultra -pure silicon, ferrite materials, etc. This machine operates at 120 mc. and at this frequency it is possible to keep a zone -refining process going in yttrium iron garnet, a material used in the recently publicized solid -state microwave amplifiers. The double glass bells surrounding the work piece serve as vacuum chambers and safety shields respectively. At the control panel (shown at right) the various critical parameters are adjusted while the main r.f. generator is located behind the glass bells. One application of induction heating that may be of particular interest to our readers is soldering. Whether it is the sealing of a transformer in its shield can, joining a feedthrough terminal to a glass bead, or the assembly of microwave cavities. induction heating allows us to solder quickly and with such concentrated heat that other delicate parts in the assembly do not get i 0 N By G. W. McCOOK Induction Heating Corp. and WALTER H. BUCHSBAUM The story of how electronics is used fo produce controlled heating in many branches of industry.

Electronics-Illustrated-1963-07
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