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In-situ investigations of interface reactions in metal coated polycrystalline and monocrystalline synthetic diamonds by XRD-phase analysis

  • : Wolfgang Tillmann1, Metin Tolan2, Manuel Pinho Ferreira1, Sergej Schneider2, Michael Paulus2
  • : 1Institute of Materials Engineering - TU-Dortmund, 2DELTA (Dortmunder Elektronenspeicherring-Anlage)
  • : PDF Download
  • : 2014

Abstract

Due to their high hardness synthetic diamonds are used in a wide range of high abrasive applications like machining and grinding. However, diamonds are able to react with metals which have a high affinity to carbon. The understanding of this behavior is very important if diamonds and metals are in contact at high temperature. This happens for example during the fabrication of diamond-metal composite materials which are mainly used as cutting segments in concrete and natural-stone machining. The heat treatment during the sintering process in powdermetallurgical fabrication routes enforces the formation of layers between the diamond surface and the metal matrix. Such layers influence directly the wear behavior of the diamond tools. In the case of carbide forming elements (Cr or Ti) the diamond retention will be better than in inert metal matrix systems (Cu or Bronze). In this work the carbide forming characteristics of metal (e.g. titanium) coated diamonds, which can be used in inert matrix compositions, will be investigated by synchrotron assisted in-situ x-ray diffraction.
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