Combustion Synthesis of Molybdenum Disilicide (MoSi2) Fine Powders

The combustion characteristics of a MoO3+SiO2+Mg system diluted with sodium chloride have been studied in order to synthesize molybdenum disilicide (MoSi2) fine powders. The effect of processing variables, including the sodium chloride content and the reactants proportion on the phase composition and microstructure of the final products, was obtained. Both the combustion temperature and the wave velocity decreased with an increase in the amount of sodium chloride. With the appropriate processing parameters, the reacted product consisted of solid crystalline MoSi2, and an MgO phase was prepared in the molten sodium halide matrix at 1100°–1350°C. The final product purification resulted in MoSi2 powder with a particle size of 100–500 nm. The mechanism of the MoSi2 formation in the sodium chloride matrix is discussed by analyzing the phase evaluation in the extinguished combustion wave.

[1]  N. Boudet,et al.  In situ synchrotron investigation of MoSi2 formation mechanisms during current-activated SHS sintering , 2007 .

[2]  S. Seal,et al.  Plasma spray formed near-net-shape MoSi2–Si3N4 bulk nanocomposites—structure property evaluation , 2005 .

[3]  Gang Wang,et al.  The Mechanism of the Formation of MoSi2 by Self-Propagating High-Temperature Synthesis , 2004 .

[4]  P. Kang,et al.  Formation mechanism and nanocrystalline phase transformation of molybdenum disilicide by mechanical alloying , 2004 .

[5]  Jong-Hyeon Lee,et al.  Self-propagating high-temperature synthesis of nano-sized titanium carbide powder , 2002 .

[6]  J. A. Sekhar,et al.  Processing, Microstructures, and Properties of Molybdenum Aluminosilicide , 1998 .

[7]  N. Angelescu.  Some considerations regarding MoSi2 synthesis , 1998 .

[8]  Yong-Seog Kim,et al.  On the formation of MoSi2 by self-propagating high-temperature synthesis , 1996 .

[9]  Timothy J. Trentler,et al.  Sonochemical synthesis of nanocrystalline molybdenum disilicide (MoSi2) , 1995 .

[10]  F. Froes,et al.  Mechanical Alloying of Titanium‐Base Alloys , 1993 .

[11]  P. L. Martı́n,et al.  Reaction synthesis of MoSi2 from high purity elemental powders , 1992 .

[12]  A. Vasudévan,et al.  A comparative overview of molybdenum disilicide composites , 1992 .

[13]  C. Maggiore,et al.  Synthesis of molybdenum disilicide by mechanical alloying , 1992 .

[14]  S. Deevi.  Diffusional reactions in the combustion synthesis of MoSi2 , 1992 .

[15]  T. Haubold,et al.  Nanocrystalline intermetallic compounds — An approach to ductility? , 1991 .

[16]  R. Birringer,et al.  Ceramics ductile at low temperature , 1987, Nature.

[17]  I. Borovinskaya,et al.  Self-propagating high-temperature synthesis of transition metal silicides , 1978 .