VPE uses induction heating methods to process and braze components and staged assemblies in vacuum, hydrogen, and air environments. With induction brazing, quick heating rates and rapid cooling times are possible, which can make the process ideal for meeting high production requirements.
Advantages of Induction Brazing
Induction brazing has a number of advantages when compared to conventional furnace brazing, including:
Higher Heating Rates
The heating rate achieved with induction brazing can be significantly higher than with furnace brazing. VPE brazes a variety of assemblies and sub-assemblies where the part temperature is increased from room temperature to 1200°C in approximately 11 seconds.
Metallurgically speaking, rapid heating means that the formation of brittle intermetallics may be avoided. For instance, gold may be used to braze titanium without adverse filler alloy/parent material reactions encountered in the relatively slow furnace-brazing techniques.
Rapid Cooling Times
Extremely rapid cooling times are also possible with induction brazing, depending on the ambient atmosphere used. In a hydrogen atmosphere, the cooling rates routinely achieved at VPE are higher than 1000°C/minute.
High Electric Currents
In induction brazing, the components to be brazed must be metallic so that suitably high electric currents may be generated from within. It is also possible to use a susceptor for generation of high currents. The susceptor radiates energy to a nearby non-metallic assembly to effect brazing.