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Materials 2016, 9(6), 495; doi:10.3390/ma9060495

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

1
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
2
College of Engineering, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Dirk Lehmhus
Received: 14 May 2016 / Revised: 16 June 2016 / Accepted: 17 June 2016 / Published: 21 June 2016
View Full-Text   |   Download PDF [2059 KB, uploaded 21 June 2016]   |  

Abstract

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. 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. View Full-Text
Keywords: porous iron; hollow Fe–N powder; free pressureless spark plasma sintering; compressive strength porous iron; hollow Fe–N powder; free pressureless spark plasma sintering; compressive strength
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cui, G.; Wei, X.; Olevsky, E.A.; German, R.M.; Chen, J. The Manufacturing of High Porosity Iron with an Ultra-Fine Microstructure via Free Pressureless Spark Plasma Sintering. Materials 2016, 9, 495.

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