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Impact of structure and flow-path on in situ synthesis of AlN: Dynamic microstructural evolution of Al-AlN-Si materials

微观结构和流动路径对AlN原位合成的影响: Al-AlN-Si微观组织形成的动力学演变研究

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Abstract

The Al-AlN-Si composites were prepared in the gas-in-liquid in situ synthesized flow-reaction-system, which was implemented by a powder metallurgy and reaction sintering route. The experimental results showed that Al-AlN-50SiB material (prepared by ball-milling powders) and Al- AlN-50SiM material (prepared by mixing powders) exhibited the semi-continuous Si structures and the isolated Si islands, respectively. Subsequently, the Al-AlN-50Si materials were selected as the model materials by phase identification and microstructure analysis. The dynamic microstructural evolution of Al-AlN-50Si materials was investigated using the computational fluid dynamics (CFD) method. Mathematical models and simulation results showed that the in situ synthesis of AlN was strongly influenced by the structure and the flowpath \(\left( {\left( {c_{g,N_2 } /l_{g,N_2 } } \right) + \left( {c_{s,AlN} /l_{s,AlN} } \right)} \right)\). The flow paths of Al-AlN-50SiB material were restricted by the semi-continuous Si. These Si structures can promote the formation of the strong turbulence with gradually weakened fluctuation, so that the in situ synthesis of AlN was interconnected and surrounded by an interpenetrating Si network. In contrast, the flow paths of Al-AlN-50SiM material can easily pass through the isolated Si due to its mild turbulence with linear relationship. As a result, AlN was separated by the isolated Si and agglomerated in the matrix. Overall, the present work provides new insights into dynamic microstructural evolution in in situ reaction sintering systems.

摘要

本文采用粉末冶金结合原位反应方法制备了不同结构的Al-AlN-Si复合材料. 基于物相鉴别和显微分析方法, 建立了具有半连续Si结构(由高能球磨粉末制备)和孤岛Si结构(由混合粉末制备)的Al-AlN-50Si微观模型, 使用计算流体动力学(CFD)方法对Al-AlN-50Si微观组织形成过程进行了研究, 并分析了其动力学演变机理. 数学模型和模拟结果表明: 微观结构和流动路径\(\left( {\left( {c_{g,N_2 } /l_{g,N_2 } } \right) + \left( {c_{s,AlN} /l_{s,AlN} } \right)} \right)\)会强烈影响AlN的原位合成. 对于Al-AlN-50SiB(由高能球磨粉末制备)材料, 其流动路径会被半连续Si结构限制而促进强湍流的形成, 这种逐渐减弱的强湍流使AlN原位合成在Si骨架周围并呈现出相互贯穿的组织结构; 相比之下, 在Al-AlN-50SiM(由混合粉末制备)材料内部会形成线性趋势的弱湍流, 其流动路径可以很容易的绕开孤岛Si, 使AlN相被隔离并富集形成在基体中. 该工作为原位反应系统中复合材料微观组织动力学演变过程的研究提供了新的思路.

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Acknowledgements

This work was supported by the financial support of the National Natural Science Foundation of China (51171146 and 51101177) and the Program for Key Science and Technology Innovative Research Team of Shaanxi Province (2013KCT-05).

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Authors and Affiliations

  1. MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi’an Jiaotong University, Xi’an, 710049, China

    Zhe Wang  (王哲), Xin Wang  (王欣), Yigang Tong  (仝毅刚) & Yaping Wang  (王亚平)

  2. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China

    Yaping Wang  (王亚平)

Authors
  1. Zhe Wang  (王哲)
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  2. Xin Wang  (王欣)
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  3. Yigang Tong  (仝毅刚)
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  4. Yaping Wang  (王亚平)
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Correspondence to Zhe Wang  (王哲) or Yaping Wang  (王亚平).

Additional information

Zhe Wang is now a PhD candidate of the School of Sciences, Xi’an Jiaotong University. His research interests focus on the preparation and properties of Al-Si based composites and their applications in electronic packaging.

Yaping Wang received his PhD degree in material science from Xi’an Jiaotong University in 1998. Currently, he is a professor at Xi’an Jiaotong University. His research interests include non-pressure impregnation of Si-Al electrical packaging materials, preparation of Cu-Cr and Ag-SnO2 contact materials and industrial manufacture of Cu-Al2O3 composite materials.

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Wang, Z., Wang, X., Tong, Y. et al. Impact of structure and flow-path on in situ synthesis of AlN: Dynamic microstructural evolution of Al-AlN-Si materials. Sci. China Mater. 61, 948–960 (2018). https://doi.org/10.1007/s40843-017-9198-4

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  • DOI: https://doi.org/10.1007/s40843-017-9198-4

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