NaF-assisted combustion synthesis of MoSi₂ nanoparticles and their densification behavior

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• 作者：Hayk H. Nersisyan^a ; ^b ; Tae Hyuk Lee^a ; ^b ; Vladislav Ri^a ; Jong Hyeon Lee^a ; ^b ; ^{jonglee@cnu.ac.kr} ; Hoyoung Suh^c ; Jin-Gyu Kim^c ; Hyeon Taek Son^d ; Yong-Ho Kim^d
• 关键词：Molybdenum disilicide ; Nanoparticles ; Combustion synthesis ; Spark plasma sintering ; Hardness
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：102
• 期：Complete
• 页码：34-41
• 全文大小：1366 K
• 卷排序：102

文摘

The exothermic reduction of oxides mixture (MoO3+2SiO2) by magnesium in NaF melt enables the synthesis of nanocrystalline MoSi2 powders in near-quantitative yields. The combustion wave with temperature of about 1000–1200 °C was recorded in highly diluted by NaF starting mixtures. The by-products of combustion reaction (NaF and MgO) were subsequently removed by leaching with acid and washing with water. The as-prepared MoSi2 nanopowder composed of spherical and dendritic shape particles was consolidated using the spark plasma sintering method at 1200–1500 °C and 50 MPa for 10 min. The result was dense compacts (98.6% theoretical density) possessing submicron grains and exhibiting hardness of 8.74–12.92 GPa.