Synthesis of MoSi2-20%TiC Nanocomposite by Method Mechanical Activated Self-Propagation Combustion Synthesis (MASHS)

Subject Areas : journal of New Materials

M. Baderloo ¹ (کارشناس ارشد مهندسی نانو مواد، پژوهشگاه مواد و انرژی کرج)
S. A. Tayebifard ² (استادیار پژوهشکده نیمه هادیها، پژوهشگاه مواد و انرژی)
M. Zakeri ³ (استادیار پژوهشکده سرامیک، پژوهشگاه مواد و انرژی)

Received: 2016-10-09 Accepted : 2016-10-09 Published : 2016-09-22

Keywords: Nanocomposite, Titanium Carbide, Molybdenum Disilicide, Mechanical Activated Self-Propagation Combustion Synthesis (MASHS),

Abstract :

      In this research elements of the raw materials used to form MoSi₂-TiC nanocomposite. The plan in this Research procedure was based on combustion synthesis, mechanical activation mechanism (MASHS). Initially  Mo, Si, Ti and C elemental powder were weighed by stoichiometry ratio and were milled with weight ratio of ball to powder 5 to 1, 10 to 1 & 15 to 1, milling time 4, 8, 12 hours with 250 and 300 rpm by the planetary mill. After wards the milled powders were compacted to pellet form by uniaxial press and synthesized samples were done in an atmospheric argon controlled tubular furnace with a temperature between 700 - 1100 ^°C. To identify phases, XRD analysis was used and to evaluate morphology, SEM and TEM images were used. XRD patterns from synthesized samples with (MASHS) method show a successful composite molybdenum disilicide - titanium carbide synthesis. Results show the best process conditions for synthesis MoSi₂-TiC nanocomposite with MASHS method was: milling duration about 4 hours, ball to powder weight ratio 15 to 1, mill rotation speed 300 rpm, constant pressure press 300MPa and temperature 850^°C. The grain size calculation by reitveld method showed the size of titanium carbide crystallite and molybdenum disilicide in optimum condition of approximately 28 nm and above 100 nm respectively. The images of SEM and TEM proved that a nanostructure composite has been synthesized.

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