Hackaday · Creativity & design

Heating in a Vacuum: Methods and Challenges

This article explores heating materials in a vacuum, focusing on radiation and conduction. It details DIY vacuum oven approaches, bypassing expensive equipment.

Heat transfer occurs via advection, conduction, convection, and radiation. In a vacuum, only radiation is effective unless the material contacts the chamber walls, allowing conduction. Heating chamber walls or an internal element are two approaches; internal elements are more efficient.

Powering an internal element requires getting electricity into the chamber. Wireless power has limitations. A DIY solution uses 'vacuum feedthroughs,' like banana plug terminals, to pass power through the chamber walls.

The author describes a setup using sealed banana plug terminals on a jar lid, connected to a PTC heating element. A desiccant sample was in an aluminum foil container to reflect heat, demonstrating a basic method.

The desiccant sample (3.25 grams) was heated by a PTC element self-regulating to ~70°C at 5 VDC. The sample maximized heat conduction. Further tests are planned at various durations under -0.8 bar vacuum.

Microwaves rapidly heat materials but can damage them. Controlled, slower heating is preferable to avoid material stress, though more research is needed.

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