Yonguk Lee

School: Illinois Institute of Technology

Major: Engineering

DOI: https://doi.org/10.21985/n2-w4jr-3870

Yonguk Lee is a fourth year undergraduate student of IIT. His major is Materials science and engineering. His main research investigates Ni based alloys that can possibly be wear resistant coating of Copper. He studied at Inha University, Korea from 2015 to 2018.

Wear-Resistant Coating of Copper for Energy Applications

Abstract

Copper is a metal that is often used as a mold for the continuous casting where the application temperature is significantly high. Because it is hard to predict mechanical properties of Cooper at the elevated temperature, actual investigation on its properties should be entailed. High temperature mechanical performance and inter-diffusion effect of copper-based alloys that had Ni or Ni/Co as the coating were investigated to estimate changes of their structure at the elevated temperature, which is similar to the environment of their application. In-situ high temperature Vickers hardness testing was conducted at 100℃, 200℃, 460℃ and room temperature. For ABNC, a rapid drop of HV at 460℃ was observed (HV: 463, 430, 330, and 72 at room temperature, 100°C, 200°C, and 460°C, respectively). From the inter-diffusion measurement, for N+ it was observed that about 10 atomic % of Ni was diffused into the copper substrate near the interface, after 28 days of heat treatment at 400℃. However for NC and ABNC, Ni and Co were not diffused into the Cu substrate. For better understanding, Vickers hardness test and optical microscopy for inter-diffused specimens and wear/scratch test and TEM work for coatings will be conducted in the future.