升温速率对Au纳米线熔断特性和熔断时间的影响

Abstract

由于熔断器在高精密仪器设备中的重要地位，其研制设计已成为研究重点。Au纳米线作为现今备受关注的高精度熔断器材料之一，传统的试制研究将会浪费大量财力和人力，采用分子动力学模拟方法，从微观结构层次研究熔断器熔断特性的影响因素具有重要意义。本文基于分子动力学模拟方法，模拟研究不同升温速率对Au纳米线熔断特性和熔断时间的影响。结果表明：Au纳米线在一定范围内升温速率越大，熔断时间越短，熔断温度越高。不同升温速率对熔断位置没有明显影响，但对熔断过程中缩颈长短有显著影响。升温速率较低时，缩颈部分较长，使得熔断后的断面呈链状，升温速率较高时，缩颈部分较短，使得熔断后的断面呈锥形。该模拟方法可以有效地跟踪熔断过程中结构的变化情况，进而指导不同应用场景的Au纳米线高精度熔断器的研制和设计。 Because of the important position of fuses in high precision instruments and equipments, the development and design of fuses have become the focus of research. As Au nanowire is one of the prevalent high precision fuse materials, the traditional trial manufacture will waste a lot of money and manpower. Therefore, it is important to study the influence factors of fuses’ fusing characteristics from the micro structure level by using molecular dynamics simulation method. In this paper, the effects of different heating rates on the fusing characteristics and the fusing times of Au nanowires were simulated based on molecular dynamics simulations method. The results show that the higher the heating rate of Au nanowires within a certain range, the shorter the fusing time and the higher the fusing temperature. The different heating rates have no obvious influence on the fusing positions, but have remarkable influence on the neck down length during the fusing process. When the heating rates are low, the necking parts are longer, so that the fused cross sections are in chain shapes. When the heating rates are high, the necking parts are shorter, which make the fused cross sections taper. The simulation method can effectively track the structural changes in the fusing process, and then guide the development and design of Au nanowire high-precision fuses for different application fields.