Abstract

The presence of a surface oxide layer on palladium powders gives rise to a densification-free sintering process controlled by a surface diffusion mechanism with an activation energy of 59.2 kJ/mol−1. At temperatures above the oxide dissociation temperature in air, 1062 K, palladium powders sinter with an activation energy of 120.4 kJ/mol"1, indicative of a grain boundary diffusion. AtT < 1061 K and under a 10−8 atm vacuum, sintered powders showed densification but with an activation energy too high to be grain boundary diffusion-related. These results are interpreted in terms of the role of the surface oxide and are compared with previously published results on the sintering of Pd.

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