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Title: Chemical inertness of Cr–W–N coatings in glass molding
Authors: Yung-I Chen
Yu-Ru Cheng
Li-Chun Chang
Jyh-Wei Lee
Contributors: 國立臺灣海洋大學:光電與材料科技學系
Keywords: Annealing
Glass molding
Mechanical properties
Date: 2015-10
Issue Date: 2018-08-16
Publisher: Thin Solid Films
Abstract: Abstract: Cr–W–N coatings with a Cr interlayer were prepared using reactive direct-current magnetron cosputtering on Si and cemented carbide substrates. To investigate the chemical inertness of Cr–W–N coatings against commercial moldable SiO2–B2O3–BaO-based glass in glass molding, thermal cycle annealing at 270 °C and 600 °C was performed in a quartz tube furnace in a 15-ppm O2–N2 atmosphere. Variations in the crystalline structure, mechanical properties, and surface roughness after various annealing durations were investigated. The results indicated that Cr37W31N32 and Cr24W46N30 coatings maintained a face-centered cubic phase and exhibited superior mechanical properties and low surface roughness after up to 1000 thermal cycles; these properties were attributed to the formation of amorphous oxide scales. By contrast, Cr8W69N23 and Cr4W82N14 coatings with a nanocrystalline W phase in the as-deposited state formed WO3 oxide scales after annealing, which negatively affected their mechanical properties and raised surface roughness values.
Relation: 593 pp.102-109
Appears in Collections:[Institute of Optoelectronic Sciences] Periodical Articles

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