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A wetting liquid will flow into a capillary gap or spread over a substrate surface because it is energetically favourable to replace the solid surfaces of the capillary wall or substrate by solid-liquid interfaces. The achievement of an equilibrium configuration takes a finite time even for idealised chemically inert systems because the driving force due to the energy decrease when a solid surface is covered by a wetting liquid is opposed by the viscosity of the liquid and the pull of gravity. This paper is concerned with the behaviour of real systems and specifically with the behaviour of braze systems. Liquid flow when brazing can be further complicated by the effects of physically tenacious oxide films on the liquid and solid surfaces and by chemical interactions at the solid-liquid interfaces. The purpose of this paper is to illustrate the importance of these additional factors by reporting observations of the behaviour of brazes on both metal and ceramic workpieces.

Additional information

Authors: PETEVES S D, JRC Petten (NL);NICHOLAS M G, JRC Petten (NL)
Bibliographic Reference: Paper presented: High Temperature Capillarity International Conference, Bratislava (SK), May 8-11, 1994
Availability: Available from (1) as Paper EN 38468 ORA
Record Number: 199411017 / Last updated on: 1994-11-28
Original language: en
Available languages: en
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