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| Naji, M. |
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| Ertürk, Emre |
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| Azam, Siraj |
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| Azevedo, Nuno Monteiro |
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Suvanto, Mika
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Publications (5/5 displayed)
- 2020Protective stainless steel micropillars for enhanced photocatalytic activity of TiO2 nanoparticles during wearcitations
- 2020Modification of halloysite nanotubes with xanthene dyes and their application in luminescent polymer nanocompositescitations
- 2015Smart porous silicon nanoparticles with polymeric coatings for sequential combination therapycitations
- 2011Influence of Carbon Nanotube-Polymeric Compatibilizer Masterbatches on Morphological, Thermal, Mechanical, and Tribological Properties of Polyethylenecitations
- 2008Thin films of MoN, WN, and perfluorinated silane deposited from dimethylamido precursors as contamination resistant coatings on micro-injection mold insertscitations
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article
Thin films of MoN, WN, and perfluorinated silane deposited from dimethylamido precursors as contamination resistant coatings on micro-injection mold inserts
Abstract
<p>To enhance their surface properties, micro-injection mold inserts made of electroplated nickel were coated with thin films of molybdenum nitride and tungsten nitride by atomic layer deposition. Alkylimido-alkylamido complexes were used as precursors together with ammonia. In addition, a perfluorinated hydrophobic coating was deposited by gas-phase method from tridecafluoro-1,1,2,2-tetrahydrooctylmethylbis(dimethylamido)silane. Injection molding tests were performed with two plastic materials: poly(4-methyl-l-pentene) copolymer TPX(TM) and polycarbonate Makrolon(R) DP1-1265. With both plastics, the nickel insert with thin film of molybdenum nitride was clearly more resistant to contamination than the uncoated insert. Also the perfluorosilane coating provided good resistance to contamination. After the 15,000 shot injection molding test, all of the coatings were still attached to the insert. Friction coefficients were determined between the nitride and silane coatings and the plastic materials. The coatings showing good contamination resistance in injection molding also had a low coefficient of friction. (C) 2008 Elsevier B.V. All rights reserved.</p>