Before the billet is placed in the chamber, its cylindrical surface is coated with a layer of…

Before the
billet is placed in the chamber, its cylindrical surface is coated with a layer
of powdered glass to develop a thin glass lubricant layer at the billet-chamber
interface. For metals that have a tendency to stick to the container and the
die, the billet can be enclosed in a thin-walled container, or jacket, made of
a softer and lower strength metal, such as copper or mild steel.

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