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Einfluss von Layout, Oberflächenzustand und Legierungselementen auf das Diffusionsschweißen mikroverfahrenstechnischer Apparate
Author(s) -
Gietzelt T.,
Toth V.,
Weingaertner T.
Publication year - 2019
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201800197
Subject(s) - materials science , metallurgy , grain size , passivation , grain boundary diffusion coefficient , atomic diffusion , dwell time , work hardening , oxide , welding , diffusion , surface roughness , microstructure , diffusion bonding , lattice diffusion coefficient , diffusion welding , surface finish , grain boundary , composite material , crystallography , effective diffusion coefficient , thermodynamics , chemistry , medicine , clinical psychology , physics , layer (electronics) , radiology , magnetic resonance imaging
The formation of a monolithic part during diffusion bonding is accompanied by the diffusion of atoms across the bonding planes. At sufficient low roughness, it mainly depends on the temperature and dwell time. At the same time, the diffusion process competes against grain growth. By adjusting an appropriate level of bearing pressure, it is possible to control deformation taking into account additional parameters resulting from mechanical microstructures and the design and aspect ratio of the part. Furthermore, material properties, such as the content of alloying elements, the degree of cold work hardening and the grain size, have an impact on diffusion and deformation behavior. Also the surface condition of mating surfaces is important to diffusion kinetics and the quality of the joint. Especially passivation layers of corrosion‐resistant alloys, such as stainless steels and nickel‐based alloys, impair diffusion. In contrast to this, cold work hardening at low depth below the surface, e. g. by means of a blasting processes, may facilitate formation of a good bond and help to limit grain size. For oxide dispersion‐strengthened materials, additional impacts on diffusion bonding behavior applies.