Ceramic multilayer coatings for glass moulding applications

Kleer, G.; Doell, W.

doi:10.1016/s0257-8972(97)00518-5

Cited by 23 publications

(7 citation statements)

References 3 publications

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“…Therefore, the requirements of protective coatings are high hardness, smooth surface morphology, high thermal stability, adequate adhesion, long cyclability, and chemical inertness. Following the successful utilization of noble metal alloys [4][5][6][7][8][9][10][11] and carbon films [12,13], transition metal nitride films [14][15][16][17][18][19][20][21][22][23], which offer cost reduction and process control benefits, have become candidates for protective coatings. The oxidation resistance levels of some transition metal nitrides have been improved by the introduction of Si; in particular, improvements to Ti-Si-N [24][25][26] and Zr-Si-N [27][28][29] coatings have been reported.…”

Section: Introductionmentioning

confidence: 99%

Bonding Characteristics and Chemical Inertness of Zr–Si–N Coatings with a High Si Content in Glass Molding

et al. 2018

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High-Si-content transition metal nitride coatings, which exhibited an X-ray amorphous phase, were proposed as protective coatings on glass molding dies. In a previous study, the Zr-SiN coatings with Si contents of 24-30 at.% exhibited the hardness of Si 3 N 4 , which was higher than those of the middle-Si-content (19 at.%) coatings. In this study, the bonding characteristics of the constituent elements of Zr-SiN coatings were evaluated through X-ray photoelectron spectroscopy. Results indicated that the Zr 3d 5/2 levels were 179.14-180.22 and 180.75-181.61 eV for the Zr-N bonds in ZrN and Zr 3 N 4 compounds, respectively. Moreover, the percentage of Zr-N bond in the Zr 3 N 4 compound increased with increasing Si content in the Zr-SiN coatings. The Zr-N bond of Zr 3 N 4 dominated when the Si content was >24 at.%. Therefore, high Si content can stabilize the Zr-N compound in the M 3 N 4 bonding structure. Furthermore, the thermal stability and chemical inertness of Zr-SiN coatings were evaluated by conducting thermal cycle annealing at 270 • C and 600 • C in a 15-ppm O 2-N 2 atmosphere. The results indicated that a Zr 22 Si 29 N 49 /Ti/WC assembly was suitable as a protective coating against SiO 2-B 2 O 3-BaO-based glass for 450 thermal cycles.

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Section: Introductionmentioning

confidence: 99%

Bonding Characteristics and Chemical Inertness of Zr–Si–N Coatings with a High Si Content in Glass Molding

et al. 2018

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“…Cr-W-N films annealed in air at 400 °C exhibited antisticking behavior toward a low glass transition temperature (Tg, 288 °C) glass material, K-PG325, whereas Cr-W-N films annealed at 500 °C exhibited poor antisticking behavior because of the occurrence of chromium oxide at this temperature [13]. CrWN [6], TiAlN [14], and TiAlN/ZrN composite [15] coatings were proposed as protective nitride coatings on glass molding dies. Studies that have focused on the oxidation and thermal stability of protective A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 4 coatings during a realistic mass production process, namely, thermal cycling annealing, have been scant.…”

Section: Introductionmentioning

confidence: 99%

Chemical inertness of Cr–W–N coatings in glass molding

et al. 2015

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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 SiO 2 -B 2 O 3 -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 O 2 -N 2 atmosphere. Variations in the crystalline structure, mechanical properties, and surface roughness after various annealing durations were investigated. The results indicated that Cr 37 W 31 N 32 and Cr 24 W 46 N 30 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, Cr 8 W 69 N 23 and Cr 4 W 82 N 14 coatings with a nanocrystalline W phase in the as-deposited state formed WO 3 oxide scales after annealing, which negatively affected their mechanical properties and raised surface roughness values.

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“…During the mass production of most molded optical glass lenses, the molding dies must endure repeated thermal cycles from room temperature to approximately 600°C under high pressing loads in a low-oxygen atmosphere [16,17]. CrN [18], CrWN [19], WCrN [20], TiAlN [21], and TiAlN/ZrN composite [22] coatings were proposed as protective nitride coatings on glass molding dies. Scant attention has been paid to the oxidation resistance and the thermal stability of protective coatings during a realistic mass production process, namely, thermal cycle annealing.…”

Section: Introductionmentioning

confidence: 99%