In high-vacuum brazing, materials are joined metallurgically by the application of heat in an ultra-clean vacuum or hydrogen atmosphere.

The brazing filler metal is applied to the cleaned joint areas of the components, which may also be located internally. By pre-applying the appropriate filler metal to component areas that are no longer accessible after assembly, it is possible to create highly complex joints. The thermal process forces within the vacuum brazing system can easily reach even internal areas.

Depending on the geometry of the components, the filler metal can be applied as wire, foil, or paste.

Once the components are placed in the vacuum brazing furnace, the chamber is first evacuated and, if required, replaced with the desired process atmosphere. During the subsequent heating phase, any remaining contamination is removed, and all components are uniformly heated. After a soaking period, the temperature is raised above the melting point of the brazing filler metal. The filler metal melts and, through capillary action, wets the surfaces to be joined.

In its molten state, the filler metal dissolves constituents of the base materials, forming a metallurgical bond similar to a welded joint. This process enables even ceramic materials such as Al_₂O_₃ or Si_₃N_₄ to be brazed without the need for prior metallization of the surfaces.

• No oxidation during brazing thanks to the vacuum atmosphere
• High strength of joints, comparable to that of the base materials
• Excellent corrosion resistance and high thermal stability of the finished components
• Ability to join dissimilar materials
• Brazing of areas that are difficult to access or inaccessible from the outside

The vacuum brazing systems from PVA TePla are electrically heated batch furnaces designed for hard and high-temperature brazing processes. These systems are engineered for operating temperatures from 800°C to 1,300°C, and in special cases, up to 1,700°C. All systems of this type can be equipped with active rapid cooling units, allowing brazed batches to be cooled down to room temperature in the shortest possible time.

• Heat exchangers and cooling plates (for heating and cooling applications)
• Diamond and carbide tools
• Turbine components (gas turbines, aircraft turbines)
• Vacuum switch chambers
• X-ray tubes
• Feedthroughs (power supply lines, etc.)
• Rotating anodes for X-ray equipment
• Instruments (pressure probes, thermocouples, sensors)
• Machine parts (pistons, housings, burner components)
• Components for mold making (contour-near cooled molds)

In addition to our portfolio of existing sizes and configurations, fully customized solutions are, of course, also available—please contact us to discuss your specific requirements!

For the production of standard and customer‑specific pressure vessels, components, and vacuum chambers, we operate our own manufacturing facility in Europe. It is entirely powered without the use of fossil fuels, fully aligning with our sustainability objectives.

Key advantages at a glance

• Fast delivery times: Greater independence from external suppliers
• Flexible customization: Short‑notice design changes can be implemented immediately.
• Reliable material availability: Constant access to high‑quality materials thanks to long‑standing local partnerships.
• Highest processing quality incl. standards: Performing welding operations in‑house allows direct monitoring of joint conformity, which is essential for meeting standards such as UNI EN ISO 3834.
• Top‑tier standards: Naturally, our facility meets our stringent requirements for quality, safety, and sustainability.