Shenzhen Alu Rapid Prototype Precision Co., Ltd.

A vacuum casting kiln typically refers to the burnout kiln used in the vacuum-assisted investment casting process (also known as lost-wax casting), particularly in jewelry making and small-scale metal casting.

Context and Process

In vacuum casting:

1.A wax model is encased in a plaster-like material called investment inside a metal flask.

2.The flask is placed in a high-temperature kiln (often a programmable digital one, like the Paragon SC2) for the "burnout" cycle. This gradually heats the flask (up to around 1300–1500°F / 700–800°C over several hours) to melt out the wax, burn off residues, and cure the investment mold, leaving a hollow cavity.

3.After burnout, the hot flask is removed from the kiln and placed in a vacuum casting machine. Molten metal (e.g., gold, silver, bronze) is poured into the flask while a vacuum pump sucks air out from the bottom (through a perforated flask), pulling the metal fully into fine details and reducing porosity or air bubbles for superior cast quality.

The kiln itself is not under vacuum during operation — it's a standard electric burnout oven. The "vacuum" part happens during the actual casting step outside the kiln. Kits often bundle a burnout kiln with a vacuum casting machine for this workflow.

Distinctions from Similar Terms

This differs from:

1.Vacuum kilns for drying wood (which operate under vacuum to evaporate moisture at lower temperatures).

2.Vacuum casting in plastics/resins (using vacuum to fill silicone molds).

In metal/jewelry contexts, "vacuum casting kiln" likely describes the essential kiln component in vacuum-assisted setups.