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氮化硅表面DLC膜压痕过程的分子动力学模拟

Molecular Dynamic Simulations of Nano-indentation Processes for DLC Films on Silicon Nitride Substrate

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【作者】 李军古乐郑德志

【Author】 Li Jun Gu Le Zheng Dezhi (School of Mechatronics Engineering,Harbin Institute of Technology,Harbin Heilongjiang 150001,China)

【机构】 哈尔滨工业大学机电工程学院

【摘要】 对β-Si3N4基体表面DLC薄膜压痕过程进行分子动力学模拟。压入过程模拟采用刚性球形压头与Tersoff势函数,考虑薄膜密度、膜厚、压入深度和基体属性对压痕过程的影响。模拟结果显示:薄膜抗压变形能力随着薄膜密度增加而变强,随着薄膜厚度增加而变弱;随压入深度增加,接触区内原子平均势能增加并转化为动能,导致温度升高,DLC膜中sp3键比例和配位数为5原子数增加,薄膜硬度增加。β-Si3N4基体属性对薄膜压痕特性产生影响,高硬度基体表面DLC膜的抗压变形能力更强,但随薄膜厚度增加其影响逐渐减弱。

【Abstract】 The nano-indentation mechanisms for DLC films on β-Si3N4 substrate were investigated by molecular dynamic simulation.The rigid ball indenter and Tersoff potential function were used and the effects of the film density,film thickness,indentation depth,and substrate characteristics were considered.The results show that the compressive deformation capacity of the film is strengthened with the increasing film density,while weakened with the increasing film thickness.During indentation processes,the average atom potential energy transfers to kinetic energy and promotes the increasing of temperature in the contact area.Accordingly the number of sp3 bond and 5-coordinated atoms,also the computed hardness value of film are increased.The hardness of substrate orientation of β-Si3N4 affects the DLC film characteristics while the effects are weakened at higher thickness.The harder substrate will be better to the compressive deformation capacity of thin DLC films.

【基金】 国家自然科学基金项目(NSFC50875058)
  • 【文献出处】 润滑与密封 ,Lubrication Engineering , 编辑部邮箱 ,2012年09期
  • 【分类号】TB383.2
  • 【被引频次】6
  • 【下载频次】225
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