The formation and role of interfaces in superhard nc-MenN/a-Si3N4 nanocomposites
The formation and role of interfaces in superhard nc-MenN/a-Si3N4 nanocomposites
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DOI：
10.1016/j.surfcoat.2006.08.112
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发表时间：
2007-03
影响因子：
5.4
通讯作者：
S. Vepřek;M. Vepřek-Heijman
中科院分区：
文献类型：
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作者：
S. Vepřek;M. Vepřek-Heijman
Veprek和Reiprich的早期发现，在nc-TiN/Si 3 N4纳米复合材料中，在界面Si 3 N4的约一个单层处实现最大硬度，这已被许多不同的nc-MenN/XxNm系统（Me=Ti，W，V，（TiAl）N，.; X=Si，B）证实。最近，这已被证实实验为TiN-Si 3 N4异质结和第一原理密度泛函理论计算。我们提出了一个一致的理解，形成的纳米复合材料与单层Si 3 N4界面的亚稳相分离。与体Si 3 N4相比，该界面在能量上是稳定的，这导致增强的结合强度和相应的内聚能。这样的增强似乎是一个普遍的有效性，在纳米尺寸的固体与良好有序的界面。本文总结了近年来对纳米复合材料力学性能的研究进展。
The early finding of Veprek and Reiprich that the maximum hardness in the nc-TiN/Si3N4nanocomposites is achieved at about one monolayer of the interfacial Si3N4has been confirmed for a number of different nc-MenN/XxNmsystems (Me=Ti, W, V, (TiAl)N,…; X=Si, B). More recently, this has been confirmed experimentally for TiN–Si3N4heterostructures and by first principle density functional theory calculations. We present a consistent understanding of the formation of the nanocomposites with one monolayer Si3N4interface by spinodal phase segregation. This interface is energetically stabilized as compared to bulk Si3N4, which results in an enhanced bond strength and corresponding cohesion energy. Such an enhancement appears to be of a general validity in nano-sized solids with well-ordered interfaces. The paper concludes a brief summary of the recent progress of the understanding of the mechanical properties of these nanocomposites.