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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Imprimir: 1093-3611
ISSN On-line: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v15.i4.60
pages 299-306

PLASMA CHEMICAL SYNTHESIS OF FINE MoSi2 AND MoSi2-Si3N4 COMPOSITE POWDERS

A. Orlov
Institute of Inorganic Chemistry, Miera str. 34, Salaspils-1, LV 2169, Latvia
J. Grabis
Institute of Inorganic Chemistry, Miera str. 34, Salaspils-1, LV 2169, Latvia

RESUMO

The preparation of fine MoSi2 and MoSi2 − Si3N4 composite powders with specific surface area of 16−33 and 30−41 m2/g respectively by evaporation of Si and Mo raw powder mixtures or coarse grained MoSi2 in radio frequency inductively coupled nitrogen plasma flow was investigated. Specific surface area of obtained powders as well as content of MoSi2 modifications, Si3N4 and extra phases Mo5Si3, Si depends on the raw powder feeding rate, the cooling gas flow rate and the composition of raw mixtures. The shape of the product particles was spherical for MoSi2 and both spherical and whiskers for composites.

Referências

  1. Petrovic, J. , Molybdenum disilicide-based high-temperature structural silicide's.

  2. Rosenthal, A. , Patent 520211 Europa, C04B35/58, Silicon nitride ceramics containing dispersed pentamolybdenum trisilicide.

  3. Petrovic, J. and Honnell, R., Molybdenum disilicide-containing silicon nitride ceramics.

  4. Ray, R. , Fine grained Mo Si2 for high temperature structural applications.

  5. Grabis, J. , Nanosize nitride-based powders prepared by the plasma technique.

  6. Orlov, A. and Palcevskis, E. , The thermodynamic investigation of molybdenum silicide's formation at the high temperatures.


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