Dresden 2006 – wissenschaftliches Programm
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MM: Metall- und Materialphysik
MM 9: Interfaces
MM 9.3: Vortrag
Montag, 27. März 2006, 15:15–15:30, IFW D
Modelling and Characterisation of Interface Reactions between Diamond and Active Brazing Alloys — •Chunlei Liu1,2, Ulrich E. Klotz1, Peter J. Uggowitzer2, and Jörg F. Löffler2 — 1Empa, Materials Science and Technology, Laboratory of Joining and Interface Technology, CH-8600 Dübendorf, Switzerland — 2Laboratory of Metal Physics and Technology, Department of Materials, ETH-Zürich, CH-8093 Zürich, Switzerland
Diamond brazing has been deemed an effective route to the manufacture of high-performance diamond abrasive tools, and knowledge of the microstructure evolution of the interfacial area and the filler metal during the brazing process is of prime interest to enhance performance and to overcome existing problems. To reveal the microstructure evolution during the brazing process, we used a combination of thermodynamic modelling and sophisticated experimental techniques. A consistent thermodynamic database of the Cu-base filler metals was developed using the CALPHAD (Calculation of Phase Diagram) approach. The thermodynamic calculation and the experimental results show good agreement. Several alloy compositions and brazing temperatures were then selected according to the thermodynamic calculation for brazing trials. The interfacial structures were examined using FIB (Focused Ion Beam) and TEM (Transmission Electron Microscopy). The morphology of the reaction layers and nano-sized carbides grown at the interface between diamond and the alloy matrix were also studied to illustrate the reaction mechanism. These results are finally used for kinetic simulations, with the aim of achieving better properties in brazed diamond tools.