Vapor-Phase Synthesis and Characterization of Ultrafine Iron Powders

Autor:	Hee Dong Jang, Kyun Young Park, Cheong Song Choi
Rok vydání:	1998
Předmět:	Hydrogen Chemistry Analytical chemistry Nucleation chemistry.chemical_element Pollution Dilution Ferrous Electron diffraction Environmental Chemistry Metal powder Geometric standard deviation General Materials Science Particle size
Zdroj:	Aerosol Science and Technology. 28:215-223
ISSN:	1521-7388 0278-6826
DOI:	10.1080/02786829808965522
Popis:	Formation of ultrafine iron powders by vapor-phase reduction of ferrous chloride with hydrogen was studied in a tubular reactor made of quartz, 3.5 cm in diameter and 1.5 m in length. Effects on the particle-size distribution of produced iron powders were investigated of various operating variables including the temperature in reaction zone, the concentration of FeCl2, and the flow rate of dilution argon gas. Ultrafine iron powders ranging from 40 to 88 nm in average particle size were produced. The geometric standard deviation was about 1.4. Particles were linked to each other to form a chain, probably due to magnetic interaction. By electron diffraction, all the particles are found to be single crystal. Over the reaction zone temperature ranging from 800 to 950°C, the average size of primary particles decreased with temperature, probably due to enhanced nucleation rate. No significant change in the particle size was observed for a reduction of reactor residence time by one-third. The coercive f...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::62f2b2cab62b5618cb46f836e0db5aad https://doi.org/10.1080/02786829808965522 Zobrazit plný text záznamu