On the Mechanism of Ultrasound-Driven Deagglomeration of Nanoparticle Agglomerates in Aluminum Melt
On the Mechanism of Ultrasound-Driven Deagglomeration of Nanoparticle Agglomerates in Aluminum Melt
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DOI：
10.1007/s11837-016-1851-z
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发表时间：
2016-05-01
期刊：
影响因子：
2.6
通讯作者：
Vorozhtsov, Sergey
中科院分区：
文献类型：
--
作者：
Kudryashova, Olga;Vorozhtsov, Sergey
将纳米粉末引入到液态金属中以增强金属基体是制备具有更高力学性能的复合合金技术的一个很有前途的方向。已知超声处理显著改善亚微米颗粒向金属熔体的引入。本研究着重于超声波作用下，熔体对这种颗粒的解团聚和润湿性的机理。所提出的机制涉及的液体金属的渗透到孔隙和裂纹的团聚体下产生的过压由内爆空化气泡和进一步破坏的团聚体的声波。通过解析建模，得到了声参数和加工时间与颗粒和熔体的物理化学性质之间的主要依赖关系。本文提出了液态金属中超声波解聚的数学描述，并报道了超声破碎团聚体的阈值强度与团聚体尺寸的关系。
One of the promising directions in the technology of composite alloys with improved mechanical properties is reinforcement of the metallic matrix with nanopowders introduced in the liquid metal. Ultrasonic processing is known to significantly improve the introduction of submicrone particles to the metallic melt. This study focuses on the mechanisms of deagglomeration and wettability of such particles by the melt under the action of ultrasound. The suggested mechanism involves the penetration of the liquid metal into the pores and cracks of the agglomerates under the excess pressure created by imploding cavitation bubbles and further destruction of the agglomerate by the sound wave. The main dependences connecting the acoustic parameters and processing time with the physical and chemical properties of particles and the melt are obtained through analytical modeling. The mathematical description of the ultrasonic deagglomeration in liquid metal is presented; a dependence of the threshold intensity of ultrasound for the break-up of agglomerates on their size is reported.