Rapid synthesis of MoSi2-Si3N4 nanocomposite via reaction milling of Si and Mo powder mixture
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第11期
论文作者：Majid Abdellahi Alireza Amereh Hamed Bahmanpou Behzad Sharafati
文章页码：1107 - 1114
摘 要：The nanocomposite of MoSi2-Si3N4（molybdenum disilicide-silicon nitride）was synthesized by reaction milling of the Mo and Si powder mixture.Changing the processing parameters led to the formation of diferent products such asα-andβ-MoSi2,Si3N4,Mo2N,and Mo5Si3at various milling times.A thermodynamic appraisal showed that the milling of Mo32Si68powder mixture was associated with highly exothermic mechanically induced self-sustaining reaction（MSR）between Mo and Si.The MSR took place around 5 h of milling led to the formation ofα-MoSi2and the reaction between Si and N2to produce Si3N4under a nitrogen pressure of 1 MPa.By increasing the nitrogen pressure to 5 MPa,more heat is released,resulting in the dissociation of Si3N4and the transformation ofα-MoSi2toβ-MoSi2.Heat treatment was also performed on the milled samples and led to the formation of Mo2N and the transformation ofα-MoSi2toβ-MoSi2at the milling times of 10 and 40 h,respectively.
Majid Abdellahi1，Alireza Amereh2，Hamed Bahmanpou3，Behzad Sharafati2
1. Department of Materials Engineering,Islamic Azad University,Najafabad Branch2. Department of Materials Engineering,Islamic Azad University,Saveh Branch3. Department of Chemical Engineering and Materials Science,University of California
摘 要：The nanocomposite of MoSi2-Si3N4（molybdenum disilicide-silicon nitride）was synthesized by reaction milling of the Mo and Si powder mixture.Changing the processing parameters led to the formation of diferent products such asα-andβ-MoSi2,Si3N4,Mo2N,and Mo5Si3at various milling times.A thermodynamic appraisal showed that the milling of Mo32Si68powder mixture was associated with highly exothermic mechanically induced self-sustaining reaction（MSR）between Mo and Si.The MSR took place around 5 h of milling led to the formation ofα-MoSi2and the reaction between Si and N2to produce Si3N4under a nitrogen pressure of 1 MPa.By increasing the nitrogen pressure to 5 MPa,more heat is released,resulting in the dissociation of Si3N4and the transformation ofα-MoSi2toβ-MoSi2.Heat treatment was also performed on the milled samples and led to the formation of Mo2N and the transformation ofα-MoSi2toβ-MoSi2at the milling times of 10 and 40 h,respectively.
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