Abstract
Through thermodynamic modelling of the reaction at ceramic-metal interface, wetting of a sintered silicon nitride was investigated with a series of Ni-based brazing alloys without addition of active elements. The thermodynamic calculations showed that NiCrSi alloys with Ni/Cr ratio of 3.5 and X Si < 0.25 will react with and wet Si 3N 4 ceramics at 1220 °C (1493 K) and P N 2 = 15 Pa. Environment verifications using sessile drop method confirmed the validity of the calculations and the assumptions made in the wetting model.
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