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A Vacuum Annealing Furnace is a type of heat treatment furnace that performs annealing (softening and stress-relieving) of metal parts under vacuum conditions - typically between 10-3 and 10-6 Torr.
How It Works:
Parts are loaded into a heat-resistant chamber.
The chamber is evacuated to remove air and moisture.
Heat is applied via radiant heaters (often graphite or molybdenum).
The material is held at temperature for a set time.
The furnace may cool under vacuum, inert gas, or forced convection.
The result: soft, clean, stress-free metal parts.
Advantages
Oxide-free surfaces - no need for post-cleaning
High purity treatment, even for reactive alloys
Controlled microstructure for dimensional stability
Excellent for complex shapes and thin sections
Avoids contamination from air, scale, or furnace walls
Ideal For
Aerospace-grade alloys
Vacuum-grade or UHV components
Surgical instruments & high-precision tools
Heat treatment of hydrogen-sensitive or oxidation-prone metals