For Stable Bonds

Diffusion Bonding

Diffusion bonding

Diffusion bonding is a joining process that is gaining increasing prominence due to its high joint quality. For multilayer components with flat, conical, or even spherical contact surfaces, diffusion bonding achieves an ideal connection. The process does not require any filler materials. As a result, diffusion bonding is considered “non-toxic” and “non-corrosive” in terms of potential cross-contamination. There is no need for elaborate post-cleaning of the components.

The result is a monolithic component with no visible joint – neither microscopically nor macroscopically. The bonded component retains the same material properties as the original joining partners.

 

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The process

Depending on requirements, diffusion bonding is carried out either in a fine or high vacuum. The components are heated to the required process temperature and then subjected to uniaxial pressure with precisely defined force. The entire joining process takes place below the liquidus point of the materials—completely without a liquid phase or the use of filler materials.

The function

The applied pressure smooths out surface asperities and establishes intimate material contact. The bond is formed by atomic diffusion across the interface. During the holding time under pressure and temperature, diffusion processes and grain growth eliminate any remaining pores in the microstructure, resulting in a complete “healing” of the joint.

Advantages

  • Pore-free, visually undetectable joints
  • Bond strength close to the base material strength of the joined components
  • Maximum corrosion resistance, as no foreign materials are involved in the joining process
  • Large-area bonds without distortion
  • Ability to join similar and dissimilar materials
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Bonded components between press platens after completed diffusion bonding process in a hot-press chamber.
Components of the same or different materials positioned between two press plates inside a hot-press chamber.
Chamber evacuation to a high-vacuum level to purify the process environment
Components being pressed between heated platens in a glowing red hot-press chamber under high temperature.
Components of the same or different materials positioned between two press plates inside a hot-press chamber.

Relevant industries

Diffusion bonding technology has a wide range of applications in a wide variety of markets. Because it allows the joining of small components through to large components, many industries benefit from this process. These include Oil & Gas, Chemicals, Machinery, Biotechnology, Pharmaceuticals and many others.

Aerospace & Defense

Diffusion bonding enables the seamless joining of complex components with maximum strength and corrosion resistance - ideal for extreme thermal and mechanical loads. It is suitable for a wide range of materials and is used in compact heat exchangers, cooling structures and structural components in aerospace and military electronics, among others.

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Automotive

The technology features rheologically optimized flow channels that eliminate sharp edges and regions with suboptimal flow. This results in minimal abrasion of the hot-runner manifold flow channels, even when processing reinforced plastics. Shear stress within the polymer is significantly reduced, enhancing the overall quality of injection-molded parts. The flow-optimized channel geometry also enables faster color changes, as melt separation and material transition occur across large radii. These capabilities make diffusion bonding a key enabler of zero-emission and hydrogen mobility — driving the future of sustainable automotive manufacturing.

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Semiconductor

Diffusion bonding enables the reliable and precise joining of critical components such as heater backplates, chill plates, and showerheads. This ensures the highest standards of quality and performance for semiconductor manufacturing applications.
Furthermore, our technology enables the production of direct liquid cooling components with the smallest contours and finest features, efficiently bonded with zero risk of clogging. This delivers outstanding corrosion resistance for the most demanding requirements of the semiconductor industry.

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Energy

Diffusion bonding enables a significant reduction in energy waste across every heat exchange process. By achieving the highest pressures, superior power density, and exceptional component lifetime, it facilitates extremely efficient technical processes that set new standards in the energy industry. Diffusion bonding is also a key enabler of hydrogen refueling infrastructure as we know it today — making the energy transition not just a vision, but a reality.

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Medical

Diffusion bonding with pure starting materials contributes to safer, regulatory-compliant medical devices, from implants and pacemakers to surgical and diagnostic tools.

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System Overview

PVA TePla offers diffusion bonding systems for a wide range of applications. Our hot presses reach temperatures of up to 1,350 °C and pressing forces of up to 1,000 tons. Thanks to multi-ram technology, the force is distributed evenly—for optimal and homogeneous results. High vacuum is reliably generated using oil diffusion pumps.

Our systems offer maximum flexibility and reliability for demanding diffusion bonding processes. In addition to our portfolio of existing sizes and configurations, we also provide fully customized solutions—please feel free to contact us!

Choose Your Ideal Heating Insert

Depending on the material, two types of heating inserts are available:

  • Graphite Heating Insert: Ideal for materials insensitive to carbon, particularly robust, durable, and cost-effective. Typical applications include PCHE heat exchangers, bioreactors, mixing units, and hot runner systems.
  • All-Metal Heating Insert: Perfect for carbon-sensitive materials such as titanium and nickel-based alloys, low-carbon stainless steels, and aluminum. Especially suitable for cooling plates and similar components—no surface pre-treatment required.

Sustainable Production Made in Europe

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.
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Two engineers standing beside a large blue industrial diffusion bonding system in a manufacturing facility.
Close-up of a lifting cylinder on an industrial hot-press system.
process vessel showing the polished inner surface and bolt fittings

Systems at a glance

Alu.Bond diffusion bonding furnace with lady at the monitor

Alu.Bond

The Alu.Bond is a hybrid-heated high vacuum diffusion bonding hot-press with excellent temperature uniformity. Its conductive full-surface heating system ensures high productivity and an economic bonding process of your Aluminum parts – saving up to 40% in energy consumption and 25% in processing time. 
Thanks to its innovative, compact, plug-and-play design and maintenance-friendly built this furnace is ideal to bond parts economically and with maximum uptime!

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Compact industrial diffusion bonding system with circular vacuum chamber door in a manufacturing facility.

Ultra.Bond

The Ultra.Bond series are metal-heated, molybdenum-heated, or graphite-heated high vacuum diffusion bonding hot-presses with excellent temperature uniformity. Their multi-pillar systems ensure a reliable and uniform bond. 

The systems are available in a wide range of sizes.

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Core.Bond hot-press with open frame structure and rectangular process chamber for diffusion bonding applications.

Core.Bond

The Core.Bond is a high vacuum diffusion bonding hot-press with excellent pressure uniformity. This economic furnace guarantees a fast return of your investment and reduces your cost per part.

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