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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.