Advanced AlN/SiO2/AlN multilayer coatings for protecting gold-like decorative surfaces: Improved hardness and color stability

Simple item page
dc.contributor.authorRaengroeng, Sitanan
dc.contributor.authorTheekhasuk, Nattharika
dc.contributor.authorSakulkalavek, Aparporn
dc.contributor.authorSakdanuphab, Rachsak
dc.contributor.authorSomdock, Nuttakrit
dc.date.accessioned2026-08-06T10:53:05Z
dc.date.available2026-08-06T10:53:05Z
dc.date.issued2025-12-01
dc.description.abstractThis study explores the development of multilayer AlN/SiO<inf>2</inf>/AlN thin film coatings to enhance tarnish resistance, surface hardness, and color stability of gold-coated silver substrates for decorative use. Gold films were deposited via electroplating, followed by multilayer coatings using reactive magnetron sputtering. The SiO<inf>2</inf> thickness was systematically varied while maintaining fixed AlN layers. Optical evaluations using CIE Lab parameters confirmed that the specimen with a 110-min SiO<inf>2</inf> layer exhibited acceptable color difference (ΔE < 5). X-ray photoelectron spectroscopy (XPS) revealed stable Al–N and Si–O bonds with minimal oxidation. Nanoindentation tests showed a significant hardness increase, reaching 7.02 ± 0.62 GPa. After 240 days of ambient exposure, multilayer-coated samples showed no visible discoloration or sulfur-induced degradation, unlike uncoated and electrochemically coated samples. These results confirm that AlN/SiO<inf>2</inf>/AlN multilayers effectively improve the durability and aesthetic stability of gold-like surfaces, offering a promising solution for long-term decorative applications.
dc.identifier.citationCurrent Applied Physics, 80, 1-8, 2025
dc.identifier.doi10.1016/j.cap.2025.08.009
dc.identifier.issn15671739
dc.identifier.other2-s2.0-105013676216
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/17470
dc.sourceCurrent Applied Physics
dc.subjectColor changes and scratches
dc.subjectGold-like jewelry
dc.subjectMulti-layer
dc.titleAdvanced AlN/SiO2/AlN multilayer coatings for protecting gold-like decorative surfaces: Improved hardness and color stability
dc.typeArticle

Files

Collections

Research