Green Compact Temperature Evolution during Current-Activated Tip-Based Sintering (CATS) of Nickel

Metals

Ahmed El Desouky¹  Kee S. Moon²  Samuel K. Kassegne² 

[1] Department of Materials Science and Engineering, Egypt Japan University of Science and Technology, Alexandria, Egypt; E-Mail:;Department of Mechanical Engineering, San Diego State University, San Diego, CA 92182, USA; E-Mails:

关键词: current activated tip-based sintering;    spark plasma sintering;    temperature distribution;    nickel;   

DOI  :  10.3390/met3020178

来源: mdpi

【 摘 要 】

Current-activated tip-based sintering (CATS) is a novel process where spark plasma sintering conditions are applied through an electrically conducting tip on a locally controlled area on a green powder compact/bed. The localization of electric current in CATS allows for unique temporal and spatial current and temperature distributions within the tip and powder compact. In this paper, special experimental setups were used to monitor the temperature profiles in the tip and at multiple locations on the surface of nickel powder compacts. A variation in the initial green density was found to have a significant effect on the maximum temperature in the tip as well as the temperature distribution across the powder compact. In general, the lowest green density specimens displayed the best conditions for localized densification. The concept of effective current density is introduced and results are discussed in relation to the densification parameter.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.