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URN etd-0721106-135851 Statistics This thesis had been viewed 2994 times. Download 384 times. Author Yu-Dung Chen Author's Email Address firstname.lastname@example.org Department Materials Engineering Year 2005 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 129 Title Study on erosion wear and corrosion behaviors of Cr-N-O duplex coatings by cathodic arc deposition system Keyword friction coefficient hardness CrN Cr2O3 erosion nanoindentation adhesion elastic modulus elastic modulus adhesion nanoindentation erosion Cr2O3 CrN hardness friction coefficient Abstract Cathodic arc deposition (CAD) process is one of physical vapor deposition. Due to the advantages of high ion rate, more ions and high ion energy, the coatings own better adhesion, high density, high homogeneity, broader coating condition, lower substrate temperature and keeping homogeneity with target, the hard ceramic films coated on steel by CAD can improve its lifetime effectively.
CrN is easy to change to dense Cr2O3, so CrN have these properties, included high hardness, oxidation resistance at high temperature, low friction, corrosion and wear resistance. In some application, the hardness of CrN is lower than TiN or TiAlN, but its oxidation and wear resistance is better than both. Based on the relationship between CrN and Cr2O3, Cr(N,O)/CrN duplex films were coated by CAD by controlling the ratio of nitrogen and oxygen flow. A series of mechanical property measurement and analysis was deformed.
As shown in the experiment, the content of chromium of droplets is higher than the Cr2O3 coating. From EPMA and XPS analysis, the Cr(N,O)/CrN coatings included other compounds, ex: CrO3,Cr2N….etc, beside CrN and Cr2O3 known by XRD. Due to Cr2O3 have the higher residual compression stress, the Cr(N,O)/CrN coating was insufficient and affected the resistance erosion, but it had higher hardness and elastic modulus and lower friction. In the corrosion test, duplex coatings is superior to single coating.
Advisor Committee Cheng-Hsun Hsu - advisor
Hui Ping Feng - co-chair
Yih Shiun Shih - co-chair
Files Date of Defense 2006-07-20 Date of Submission 2006-07-24