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首页> 外文会议>Symposium on Nanophase and Nanocomposite Materials III held November 29-December 2, 1999, Boston, Massachusetts, U.S.A. >Nanocomposites nc-TiN/a-Si_3N_4/a- and nc-TiSi_2 with hardness exceeding 100 GPa and high fracture toughness
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Nanocomposites nc-TiN/a-Si_3N_4/a- and nc-TiSi_2 with hardness exceeding 100 GPa and high fracture toughness

机译：纳米复合材料nc-TiN / a-Si_3N_4 / a-和nc-TiSi_2，硬度超过100 GPa，断裂韧性高

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摘要

In course of further development of our generic concept for the design of novel superhard nanocomposites [1,2] we have recently developed new multi-phase ultrahard nano-composite coatings with Vickers mirohardness of 80 to 105 GPa which is in the range of natural diamond. The coatings show a high elastic recovery of up to 90percent upon a relatively large indentation deformation. The hardness measured by the depth sensing technique agree with those calculated from the area of the remaining pseudoplastic deformation. The very high apparent fracture toughness is illustrated by the absence of any radial cracks upon indentation with a large load of 1 N into 10.3 mu m thick film [3]. The unusual combination of high hardness, elastic recovery and apparent fracture toughness was attributed to the ample possibility of cracks deflection, meandering and termination during loading and cracks closure upon unloading [1,2,4]. The suggested nanostructure of the coatings has been elucidated on a basis of a complex analysis by means XRD, EDX, ERD, XPS and HR TEM.
机译：在进一步设计新颖的超硬纳米复合材料的通用概念[1,2]的过程中，我们最近开发了新型多相超硬纳米复合材料涂层，维氏显微硬度为80至105 GPa，在天然金刚石范围内。该涂层在较大的压痕变形后显示出高达90％的高弹性回复率。通过深度传感技术测得的硬度与根据剩余假塑性变形的面积计算出的硬度一致。在压入10.3微米厚的薄膜时，以1 N的大载荷压痕时，没有任何径向裂纹，表明了很高的​​表观断裂韧性[3]。高硬度，弹性恢复和明显的断裂韧性的不寻常组合是由于在加载过程中裂纹挠曲，弯曲和终止以及在卸载时裂纹闭合的可能性很大[1,2,4]。借助XRD，EDX，ERD，XPS和HR TEM在复杂分析的基础上，阐明了建议的涂层纳米结构。

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