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Journal of Materials Science

, Volume 26, Issue 18, pp 5093–5100 | Cite as

Experimental investigation on induction brazing of diamond with Ni-Cr hardfacing alloy under argon atmosphere

  • A. K. Chattopadhyay
  • L. Chollet
  • H. E. Hintermann
Papers

Abstract

In recent years direct brazing of a monolayer of diamond crystals on a steel substrate with active filler metals has gained tremendous importance in the industry, with a view to developing tools which can out-perform the conventional galvanically bonded diamond tools. An existing proprietary process uses a specially prepared Ni-Cr filler metal to facilitate its application on a steel substrate. The brazing is done either in a vacuum or a dry hydrogen furnace. The present study has shown that a commercially available Ni-Cr hardfacing alloy, flame-sprayed on a steel substrate with an oxyacetylene gun, could be used for direct brazing of diamond particles. Induction brazing was carried out in an argon atmosphere only for short durations. During brazing under such conditions, the chromium present in the alloy segregated preferentially to the interface with diamond to form a chromium-rich reaction product promoting the wettability of the alloy. It has been further revealed that under a given set of brazing conditions, the wettability of the Ni-Cr hardfacing alloy towards diamond grits primarily depended on its layer thickness. Such dependence resulted in significant variation of topographical features of the tool and its wear mode in simulated grinding tests.

Keywords

Wettability Steel Substrate Filler Metal Diamond Crystal Diamond Tool 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1991

Authors and Affiliations

  • A. K. Chattopadhyay
    • 1
  • L. Chollet
    • 1
  • H. E. Hintermann
    • 1
  1. 1.Centre Suisse d'Electronique et de MicrotechniqueCSEMNeuchâtelSwitzerland

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