arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.02650cond-mat.softcond-mat.mtrl-sci
收藏

硬质材料粘附:粗糙度的哪个尺度很重要?

Hard-material Adhesion: Which Scales of Roughness Matter?

Luke A. Thimons, Abhijeet Gujrati, Antoine Sanner, Lars Pastewka, Tevis D. B. Jacobs

摘要:

表面形貌强烈地改变硬材料接触的粘附性,然而真实表面的粗糙度通常存在于许多长度尺度上。这项研究的目的是确定哪些尺度的地形有最强的影响,宏观粘附。附着力测量技术相关的金刚石涂层的不同粗糙度使用球形红宝石探针,是足够大的($0.5$ -mm直径)采样所有长度尺度的地形。对于每种材料,进行了多次$2000$拔出力测量,以研究粘附的大小和统计分布。使用球接触模型,测量了粗糙度相关的粘附功的有效值,范围从$0.08$到$7.15$ mJ/m $^2$跨越四个表面。使用数值分析更准确地拟合数据,其中在所有接触表面的AFM测量的形貌上整合相互作用势。这些计算表明,考虑材料中的纳米级塑性对于测量的良好定量拟合至关重要,并且在测试后用探针的AFM测量证实了这种塑性的存在。该分析能够提取几何无关的材料参数;确定红宝石和金刚石之间的粘附的本征功为$46.3$ mJ/m $^2$。粘附的范围是$5.6$ nm,这是比通常假设的原子相互作用,但与其他最近的调查。最后,对相同的表面重复进行数值分析,但这次包括或过滤了不同长度尺度的粗糙度。结果表明,$43$ nm和$1.8$ nm之间的横向尺寸的长度尺度的临界带,其对这些硬的粗糙接触的总粘附力具有最强的影响。

英文摘要:

Surface topography strongly modifies adhesion of hard-material contacts, yet roughness of real surfaces typically exists over many length scales. This investigation aims to determine which scales of topography have the strongest effect on macroscopic adhesion. Adhesion measurements were performed on technology-relevant diamond coatings of varying roughness using spherical ruby probes that are large enough ($0.5$-mm-diameter) to sample all length scales of topography. For each material, more than $2000$ measurements of pull-off force were performed in order to investigate the magnitude and statistical distribution of adhesion. Using sphere-contact models, the roughness-dependent effective values of work of adhesion were measured, ranging from $0.08$ to $7.15$ mJ/m$^2$ across the four surfaces. The data was more accurately fit using numerical analysis, where an interaction potential was integrated over the AFM-measured topography of all contacting surfaces. These calculations revealed that consideration of nanometer-scale plasticity in the materials was crucial for a good quantitative fit of the measurements, and the presence of such plasticity was confirmed with AFM measurements of the probe after testing. This analysis enabled the extraction of geometry-independent material parameters; the intrinsic work of adhesion between ruby and diamond was determined to be $46.3$ mJ/m$^2$. The range of adhesion was $5.6$ nm, which is longer than is typically assumed for atomic interactions, but is in agreement with other recent investigations. Finally, the numerical analysis was repeated for the same surfaces but this time with different length-scales of roughness included or filtered out. The results demonstrate a critical band of length-scales between $43$ nm and $1.8$ nm in lateral size that has the strongest effect on the total adhesive force for these hard, rough contacts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑