Coral-like iron particles synthesized by morphology controllable reduction process. Issue 5 (1st April 2018)

• Record Type: Journal Article
• Authors: Rahman, Jamil Ur; Lee, Hyeon Jin; Du, Nguyen Van; Tak, Jang-Yeul; Kim, Dae Sung; Kim, Myong-Ho; Yoon, Hyun Ki; Kim, Ji Youn; Jang, Yoon Hee; Cheong, Hae-Won; Lee, Soonil
• Is Part Of: Ceramics international. Volume 44:Issue 5(2018)
• Page Start: 5359
• Page End: 5364
• Publication Date: 2018-04-01
• Subjects: Iron powder -- Ignition sensitivity -- Pyrotechnics -- Reductions; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.12.156
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: This paper reports a novel synthesis of iron (Fe) powders in which high-purity and controlled primary and secondary assembled particles can be produced at low cost with safe process. Iron hydroxide powder precursors with fine-sized and acicular morphology were prepared and then reduced at an optimum temperature under reducing atmosphere by using single-step and two-step reduction. In the case of two-step reduction, the precursor powders were reduced by using a hydrogen/argon mixed gas for 1.5 h with a subsequent second reduction using higher hydrogen/argon mixed gas for 2 h. The morphology of the Fe powders strongly depends on the reduction conditions and precursor's morphology. The two-step reduced powders had pure iron powders with large elongated shape and porous sponge-like interlocking structure. The synthesized Fe powders were mixed with KClO4 and the pyrotechnic performance was examined. It is found that metal powder prepared by using two-step reduction is very suitable for producing porous sponge-like microstructure and for pyrotechnic applications.