Title: Bonding sections of graphite

Authors: N . Bandyopadhyay

Addresses: The BOC Group Technical Center, 100 Mountain Avenue, Murray Hill, New Jersey, USA

Abstract: We have investigated various techniques for joining large sections of graphite which will be useful for the construction of graphite mandrels (tools) for the manufacture of fibre-reinforced composites. The effects of brazing alloy, brazing environment, joint design and metallized coating thickness on brazed joint integrity were studied. Graphite sections can be brazed directly using a titanium containing Ag-Cu-Ni brazing alloy under an argon or a hydrogen-containing furnace atmosphere, rather than under vacuum as previously practiced. The brazed joint showed excellent strength at room temperature as well as at elevated temverature. Graohite test oieces metallized with electroless nickel (coating thickness of 0.632 inches) and then subskquently brazed with conventional brazing alloy under inert or slightly reducing atmosphere also showed excellent joint integrity at room temperature as well as at elevated temperature

Keywords: graphite joining; electroless coating; flexural strength; graphite tooling; bonding sections; graphite mandrels; fibre-reinforced composites; brazing alloys; joint design; metallised coating thickness; joint integrity; titanium.

DOI: 10.1504/IJMPT.1989.036732

International Journal of Materials and Product Technology, 1989 Vol.4 No.3, pp.203 - 214

Published online: 06 Nov 2010 *

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