Analysis of Fluxless, Reactive Brazing of Al Alloys Using Differential Scanning Calorimetry

作者：Corbin Stephen Francis^*; Winkler Sooky; Turriff Dennis R; Kozdras Mark

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2014, 45A(9): 3907-3915.

DOI：10.1007/s11661-014-2349-3

During this investigation, a technique was developed, using differential scanning calorimetry (DSC), to quantitatively analyze the influence of a Ni-based electrolytic braze promotor surface deposit on the furnace brazing of aluminum alloys. The purpose of this braze promoter was to induce a large exothermic surface reaction capable of disrupting a tenacious oxide present on the aluminum braze sheet faying surface. A cyclic DSC methodology was developed which was capable of a quantitative determination of the exothermic reaction (Delta H (exo)) induced by the Ni plating. Samples with a small quantity of Ni plating exhibited significant %26quot;pre-reaction%26quot; between Ni and Al in the solid state which resulted in very low Delta H (exo) values. Samples with higher quantities of Ni plating exhibited large Delta H (exo) values up to 85 kJ/mole.

• 出版日期2014-8