Dense Mosi2 produced by reactive flash sintering: Control of Mo/Si agglomerates prepared by high-energy ball milling
Dense Mosi2 produced by reactive flash sintering: Control of Mo/Si agglomerates prepared by high-energy ball milling
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DOI：
10.1016/j.powtec.2010.08.054
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发表时间：
2011-03
影响因子：
5.2
通讯作者：
G. Cabouro;S. L. Gallet;S. Chevalier;E. Gaffet;Y. Grin;F. Bernard
中科院分区：
文献类型：
--
作者：
G. Cabouro;S. L. Gallet;S. Chevalier;E. Gaffet;Y. Grin;F. Bernard
本工作的目的是确定MA混合物的团聚状态对SPS最终产物的微观结构和化学成分的影响。为了通过自蔓延高温合成(SHS)反应制备出显微结构和密度可控的MoSi2，研究了机械活化(MA)Mo/Si混合粉末的特性。事实上，MA粉末的表面比表面积、大小、物相组成和微观结构都得到了表征。高能球磨允许形成由纳米钼和硅微晶组成的团聚体(0.8800μm)，这是连续断裂焊接过程的结果。由于界面数目的增加，这提高了粉末混合物的反应活性。采用放电等离子烧结(SPS)工艺可以一步实现同时合成-固结。这项研究是在三种凝聚体尺寸上进行的：∅<；125μm，≤125μm<；250μm和≥250μm。
The objective of this work is to determine the influence of the agglomeration state of the MA mixture on the microstructure and the chemical composition of SPS end-products. In order to produce MoSi2with a microstructure and a density perfectly controlled via reactive sintering implying an SHS reaction, the characteristics of Mo/Si mechanically activated (MA) powder mixtures were investigated. Indeed, the MA powders have been characterized in terms of their surface specific area, size, phase composition and microstructure. The high-energy milling allows the formation of agglomerates (0.8 to 800μm) composed of nanometric crystallites of molybdenum and silicon, as a consequence of a continuous fracture-welding process. This enhances the reactivity of powder mixtures due to an increase of interface number. The simultaneous synthesis–consolidation in one step could be performed using the spark plasma sintering (SPS) process. This study was performed on three agglomerate sizes: ∅<125μm, ≤125μm<250μm and≥250μm.