Diffusion Bonding Furnaces / Hot press

In terms of furnace technology, these are based on the PVA brazing furnaces and are also fitted with a hydraulic pressing unit. Depending on the system size, pressing forces of up to 600 metric tons can be applied to the components to be bonded. A special multi-stamp system made from high-strength materials with good thermal stability ensures that forces are distributed homogeneously, even in the case of large components with mating surfaces in excess of 1 m². High-precision measurement sensors guarantee reproducible bonding conditions, thereby enabling this technology to be used in series production processes as well.

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The PVA diffusion bonding furnaces are designed for temperatures as high as 1,350 °C. Optimal force distribution is essential, especially in the case of large mating surfaces, which are very difficult to model depending on the brazing technology used—in fact, it is often not possible at all. From certain press plate sizes upwards, there is a multi-stamp version available that demonstrably produces excellent results. Using special and suitable materials for the stamps and press plates guarantees outstanding temperature distribution, even in pressing operation. Directly detecting the pressing force with controllers and software developed in-house means that surface pressure can be configured precisely. The diffusion bonding furnaces are also suitable for heat treatment and vacuum/high-vacuum brazing. In terms of pumps, oil diffusion and turbomolecular devices are used.

The technology of diffusion bonding

Furnace MOV-HP

This furnace type is a high-vacuum diffusion bonding system with an all-metal heating element. The MOV series can be used for any material compatible with diffusion bonding, and especially for materials with a chemical affinity for carbon as well as reactive materials such as titanium alloys or special nickel-based alloys. This type of furnace is also ideally suited to diffusion bonding of aluminum materials such as those used in cooling plates.

A metal heating element, made from molybdenum or a molybdenum alloy, is provided for this purpose. A metal heating element presents a smaller insulation surface than graphite insulation and less potential for degassing. This enables the rapid heating rates needed for homogeneous diffusion to be achieved. Fast cooling rates are also required, which is why active rapid cooling is used.
Furnace COV-HP

This type of furnace encompasses high-vacuum diffusion bonding furnaces with heating elements made of graphite materials. They can be used for any materials that are compatible with diffusion bonding and are not particularly sensitive to carbon.
The advantages: The furnaces are exceptionally robust and cost-effective.