Dense Mosi2 produced by reactive flash sintering: Control of Mo/Si agglomerates prepared by high-energy ball milling

Autor:	Sébastien Chevalier, Yu. Grin, Eric Gaffet, Frédéric Bernard, G. Cabouro, S. Le Gallet
Rok vydání:	2011
Předmět:	Materials science Silicon General Chemical Engineering Sintering Mineralogy Spark plasma sintering chemistry.chemical_element Microstructure chemistry Chemical engineering Agglomerate Specific surface area Crystallite Ball mill
Zdroj:	Powder Technology. 208:526-531
ISSN:	0032-5910
DOI:	10.1016/j.powtec.2010.08.054
Popis:	The objective of this work is to determine the influence of the agglomeration state of the MA mixture on the microstructure and the chemical composition of SPS end-products. In order to produce MoSi2 with a microstructure and a density perfectly controlled via reactive sintering implying an SHS reaction, the characteristics of Mo/Si mechanically activated (MA) powder mixtures were investigated. Indeed, the MA powders have been characterized in terms of their surface specific area, size, phase composition and microstructure. The high-energy milling allows the formation of agglomerates (0.8 to 800 μm) composed of nanometric crystallites of molybdenum and silicon, as a consequence of a continuous fracture-welding process. This enhances the reactivity of powder mixtures due to an increase of interface number. The simultaneous synthesis–consolidation in one step could be performed using the spark plasma sintering (SPS) process. This study was performed on three agglomerate sizes: ∅ < 125 μm, ≤125 μm < 250 μm and ≥ 250 μm.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e01628986d9caaafd5498519109276fc https://doi.org/10.1016/j.powtec.2010.08.054 Zobrazit plný text záznamu Full Text from ScienceDirect