Perhaps a half-dozen times over the course of The Doctor’s career have vacuum furnace users reported the presence of a white layer on the surface and near-surface of steel and stainless steel component parts after vacuum hardening and/or carburizing followed by vacuum oil quenching.
One of the many vacuum processes to take note of today is that of diffusion bonding (aka diffusion welding or thermo-compression bonding). This technology, although highly specialized, continues to gain in popularity with design engineers and is finding more applications throughout manufacturing. Let’s learn more.
Before the holidays we talked about how vacuum-pump oil becomes contaminated. It is now time to talk about how to overcome this problem using gas ballasting – how it is performed, its advantages and limitations.
Gas ballasting is essential for oil-sealed pumps such as rotary-vane (i.e., mechanical) pumps, but it is often poorly understood or neglected as part of the daily maintenance routine on a vacuum furnace.