Effect of pulse current on the oxide layer during pulse current pressure sinteing of aluminum powder

Citation
T. Nagae et al., Effect of pulse current on the oxide layer during pulse current pressure sinteing of aluminum powder, J JPN METAL, 65(8), 2001, pp. 726-733
Citations number
24
Language
GIAPPONESE
art.tipo
Article
Categorie Soggetti
Metallurgy
Journal title
JOURNAL OF THE JAPAN INSTITUTE OF METALS
ISSN journal
0021-4876 → ACNP
Volume
65
Issue
8
Year of publication
2001
Pages
726 - 733
Database
ISI
SICI code
0021-4876(200108)65:8<726:EOPCOT>2.0.ZU;2-9
Abstract
The pulse current pressure sintering and hot press process were applied for sintering of aluminum powder produced by water and gas atomizing methods. The pulse current pressure sintering process could densify the water atomiz ed powder in a short time compared with the hot pressing because it could r emove the H-2 gas at lower temperature. The gas prevents sintering of alumi num powder. The tensile strength of the pulse current pressure sintered gas atomized powder which contains low H-2 was higher than that of hot pressed specimen. The electric resistivity of sintered specimens obtained by pulse current pressure sintering process was lower than that of hot pressed spec imen. The oxide layer destruction was confirmed by this measurement of elec tric resistivity. The oxide layers were supposed to be fractured by the hig h temperature zone which was attributed to joule heat by the contact resist ance.