File(s) under embargo

Reason: Publisher requirement.

11

month(s)

12

day(s)

until file(s) become available

Insights into thin film blistering of gold coating on metal substrate

journal contribution
posted on 22.11.2022, 15:12 authored by Jing Cao, Bo Yuan, Na Gong, Tzee Luai Meng, Siew Lang Teo, Anna Marie Yong, Xikui Zhang, Ming Lin, Rahul Karyappa, Lei Zhang, Chee Kiang Ivan Tan, Ady Suwardi, Qiang Zhu, Hongmei Jin, Christopher HarveyChristopher Harvey, Simon WangSimon Wang, Hongfei Liu

Au thin films, up to h ≈ 90 nm thick, have been deposited by direct current sputtering at room temperature to address the effect of coating thickness on film blistering that occurred on Ni-based single crystal (NBSC) superalloy rather than on Si. Transmission electron microscopy provides evidence that the blisters nucleated at the Au/NBSC interface. Statistically, the diameters of the blisters increases while their density decreases with the increase in h; however, the height-to-diameter ratios of the blisters measured from the film surface are rather constant and independent of h. When h is increased from ≤63 nm to ∼90 nm, the size distribution of the blisters turns from a single mode to a bimodal along with an emergence of larger circular blisters and edge-like ones. Mechanical modelling and density-function calculations provide evidence that the formation of blisters is driven by pockets of energy concentration while the nucleation site is influenced by surface absorbents of the substrate.

Funding

A*STAR RIE2020 advanced manufacturing and engineering programmatic grant through the structural metal alloys program (Grant no. A18B1b0061)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Applied Surface Science

Volume

611

Issue

Part A

Publisher

Elsevier BV

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Applied Surface Science and the definitive published version is available at https://doi.org/10.1016/j.apsusc.2022.155700

Acceptance date

11/11/2022

Publication date

2022-11-15

Copyright date

2022

ISSN

0169-4332

Language

en

Depositor

Dr Christopher Harvey. Deposit date: 18 November 2022

Article number

155700