Shock Absorption Effect on Particle Fragmentation and Microstructural Features of Vacuum-Kinetic-Sprayed Al 2 O 3 Film o
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Shock Absorption Effect on Particle Fragmentation and Microstructural Features of Vacuum-Kinetic-Sprayed Al2O3 Film on Polycarbonate Substrate Hyungkwon Park1
•
Hansol Kwon2 • Jaeick Kim2 • Changhee Lee2
Submitted: 20 April 2020 / in revised form: 13 August 2020 Ó ASM International 2020
Abstract As the demand for flexible devices has increased, polymers have become very promising materials for these applications because they have excellent flexibility, lightweight, and low cost. Vacuum kinetic spraying can be a good alternative technology for film fabrication on polymers as dense ceramic films can be fabricated even at room temperature without thermal degradation of the polymer substrate. However, there is a lack of understanding of the deposition process of ceramic films on a polymer substrate. In this regard, the deposition behavior and microstructural features were investigated by comparing Al2O3 particle deposition on glass and polycarbonate (PC) substrates by using simulations and experimental methods.Simulations demonstrated that hard particles were prone to penetrate or be only embedded in the soft substrate without sufficient fragmentation. This is attributed to the shock absorption effect of the substrate. Particle kinetic energy was transferred mostly to the internal energy of the
This article is part of a special topical focus in the Journal of Thermal Spray Technology on Aerosol Deposition and Kinetic Spray Processes. This issue was organized by Dr. Kentaro Shinoda, National Institute of Advanced Industrial Science and Technology (AIST); Dr. Frank Gaertner, Helmut-Schmidt University; Prof. Changhee Lee, Hanyang University; Prof. Ali Dolatabadi, Concordia University; and Dr. Scooter Johnson, Naval Research Laboratory. & Changhee Lee [email protected] 1
Steel Department, Advanced Metals Division, Korea Institute of Materials Science, Formerly with Hanyang University, 797 Changwondae-ro, Seongsan-gu, Changwon, Gyeongnam 51508, Republic of Korea
2
Kinetic Spray Coating Laboratory (NRL), Division of Materials Science and Engineering, Hanyang University, Seongdong-gu, Seoul 04763, South Korea
soft substrate but not to particle internal energy (plasticity and/or failure), which prevents particle fragmentation. Consequently, unusual interface microstructural feature was attributed to insufficient particle fragmentation by the shock absorption of the soft substrate. Keywords deposition mechanism microstructure simulation vacuum kinetic spraying (VKS) process
Introduction Recently, the demand for flexible devices has increased with the development of wearable or flexible electronic technologies. Although glass has been widely used in lightemitting devices, it is intrinsically brittle, which hinders this application (Ref 1). Polymers are very promising materials for flexible substrates because they have excellent flexibility, high transparency, lightweight, and low cost (Ref 2) However, they are susceptible to thermal degradation, which limits film fabrication on the substrate. It
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