2,315
edits
Changes
→Clad Semi-Finished Pre-Materials (Contact-Bimetals)
During ''hot cladding'', the classic process, the materials to be clad are
assembled into a cladding package in block or plate form, heated to about
800°C and clad (or “welded”) together under high pressure ''<xr id="fig:3.3"/>(Fig. 3.3)''. At the
interface between the two materials a non-separable bond is formed by either
diffusion of the reaction partners or in liquid phase by forming a AgCu eutectic
Fig. 3.3 Hot cladding of pre-materials (schematic)
<figure id="fig:3.3">
[[File:Hot cladding of pre-materials (schematisch).jpg|right|thumb|Hot cladding of pre-materials (schematisch)]]
</figure>
In the ''Cold Roll-Cladding'' process the bond between the contact and carrier material is achieved by cold deformation of > 50% in one rolling pass ''(Fig. 3.4)''. The high plastic deformation causes cold welding in the boundary layer between the two materials. To increase the quality and strength of the bond a subsequent diffusion annealing is performed in most cases. This process is most suitable for clad semi-finished strips with thin contact material layers (≥ 2 μm) and large strip length (> 100 m).
