Diffusion welding device

Scheme of the diffusion welding device (Basile and Gallucci, 2011c). 

Takeda, T., Kunitomi, K., Horie, T., Iwata, K., Feasibility study on the applicability of a diffusion-welded compact intermediate heat exchanger to next-generation high temperature gas-cooled reactor, Nucl. Eng. Des. 1997, 168,11-21. Bier W., Keller W., Linder G., Seidel, D., Schubert, K., Martin, H., Gas-to-gas heat transfer in micro heat exchangers, Chem. Eng. Process. 1993, 32, 33-43. Schubert, K., Brandner J., Fichtner M., Linder G., Schygulla, U., Wenka, A., Microstructure devices for applications in thermal and chemical process engineering, Microscale Therm. Eng. 2001, 5,17-39. www.fzk.de, Forschungszentrum Karlsruhe, 17 July 2004. 

Berezhinsky et al. used SMS to measure the effects of thermal annealing on bulk and interface properties of ZERODUR glass ceramics [67]. ZERODUR is used as the mirror substrate for large-scale telescopes. Components of devices made of ZERODUR can be connected by diffusion welding using an aluminium film of lOOnm thickness. This film is then annealed. The performance of the weld depends on chemical and physical phenomena occurring at the aluminium-ZERODUR... 

Metal foils are joined through diffusion welding by pressing them together through specially designed devices [10,47]. In the first apparatus developed at ENEA Frascati laboratories, the overlapped limbs of the thin Pd-Ag sheet wrapped around an alumina bar are compressed in the device shown in Figure 13.17. 

Conventional welding may well be applied for prototypes and small series production especially for bonding of reactor/device periphery such as inlet diffusers and fluidic connections. In the case of chemical reactors, overheating needs to be avoided if precoating techniques are applied to avoid damage to the catalyst coating. 

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