Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 31: Nanocharacterization
MM 31.6: Vortrag
Mittwoch, 28. März 2012, 11:30–11:45, H 1029
Structural investigations on the interfacial layer between diamonds and metal matrices in diamond tools via X-ray scattering — •Andre Steffen1, Michael Paulus1, Christian Sternemann1, Manuel Pinho Ferreira2, Christian Kronholz2,4, Ralph Wagner3, Wolfgang Tillmann2, and Metin Tolan1 — 1Fakultät Physik/DELTA, TU Dortmund, D-44221 Dortmund — 2Institute of Materials Engineering, TU Dortmund, D-44221 Dortmund — 3Fachbereich C - Abteilung Physik, Bergische Universität Wuppertal, D-42097 Wuppertal — 4Benteler Tube Management GmbH, D-33104 Paderborn
Diamond grinding tools have widely established its usage in machining and cutting of hard materials such as natural stone and concrete. These diamond metal composites are mainly fabricated powder-metallurgically. The sintered metal serves as a boundary matrix for the embedded diamond grains. Therefore the bonding type of the diamonds in the metal matrices is of essential relevance. So it is of important interest if the interfacial area between the diamonds and metal matrices consist of metal-carbides, solid solutions of carbon in metal or even graphite. In this work diamond metal (Co, Fe, Cr) composites have been investigated by X-ray absorption near-edge fine structure spectroscopy (XANES) and X-ray diffraction (XRD) in order to analyse the structure of the interfacial layer between the diamonds and the metal matrices. First analysis of the XANES data indicate changes in the local structure due to the sintering process. XRD studies show the formation of graphite.