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Title: The Manufacturing of High Porosity Iron with an Ultra-Fine Microstructure via Free Pressureless Spark Plasma Sintering

High porosity (>40 vol %) iron specimens with micro- and nanoscale isotropic pores were fabricated by carrying out free pressureless spark plasma sintering (FPSPS) of submicron hollow Fe–N powders at 750 °C. Ultra-fine porous microstructures are obtained by imposing high heating rates during the preparation process. This specially designed approach not only avoids the extra procedures of adding and removing space holders during the formation of porous structures, but also triggers the continued phase transitions of the Fe–N system at relatively lower processing temperatures. In conclusion, the compressive strength and energy absorption characteristics of the FPSPS processed specimens are examined here to be correspondingly improved as a result of the refined microstructure.
Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
1306381
Grant/Contract Number:
SC0008581
Type:
Accepted Manuscript
Journal Name:
Materials
Additional Journal Information:
Journal Volume: 9; Journal Issue: 6; Journal ID: ISSN 1996-1944
Publisher:
MDPI
Research Org:
San Diego State Univ., San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC); Materials Sciences Division
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE porous iron; hollow Fe-N powder; free pressureless spark plasma sintering; compressive strength