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.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
W. H. Harris Jr, US Patent 3 248 189 (1966).
Idem., US Patent 3 378 361 (1968).
G. R. Held, US Patent 3 868 235 (1975).
C. H. Dawson, US Patent 3 615 309 (1971).
R. F. Cole, Patent W084/02300 (1984).
Wall Colmonoy Corporation, Patent U.I. 1 114 353 (1968).
I. Amato, P. G. Cappelli and P. C. Martinengo, Welding J. 53 (1974) 623.
G. A. Slack and W. S. Knapp, US Patent 4 239 502 (1980).
J. T. Lowder and E. M. Tausch, US Patent 4 018 576 (1977).
L. M. Peterman, in Proceedings of Superabrasive '85 Conference, Chicago, April 1985.
E. F. Nippes, “Metals Handbook”, 9th Edn, Vol. 6 (American Society for Metals, Metals Park, OH) p. 788.
D. Evens, M. Nicholas and P. M. Scott, Industr. Diamond Rev. (September 1977) 306.
R. Standing and M. Nicholas, J. Mater. Sci. 13 (1978) 1509.
J. R. Davis, “Metals Handbook”, 9th Edn, Vol. 16 (American Society for Metals, Metals Park, OH) p. 430.
About this article
Cite this article
Chattopadhyay, A.K., Chollet, L. & Hintermann, H.E. Experimental investigation on induction brazing of diamond with Ni-Cr hardfacing alloy under argon atmosphere. J Mater Sci 26, 5093–5100 (1991). https://doi.org/10.1007/BF00549897
- Steel Substrate
- Filler Metal
- Diamond Crystal
- Diamond Tool