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URN etd-0810110-164930 Statistics This thesis had been viewed 3571 times. Download 507 times. Author Nian-Ren Chen Author's Email Address firstname.lastname@example.org Department Materials Engineering Year 2009 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 162 Title Effects of Electroless Nickel Interlayer and TiCrN Arc-multilayers on Surface Properties of ADI Keyword Friction coefficient Austempered ductile iron Cathodic arc deposition Electroless Nickel Plastic deformation resistance TiCrN multilayers Residual stress Corrosion resistance Corrosion resistance Residual stress TiCrN multilayers Plastic deformation resistance Electroless Nickel Cathodic arc deposition Austempered ductile iron Friction coefficient Abstract Austempered ductile iron (ADI) that made by austempering heat treatment is a material with high tensile strength, wear resistance and low cost. Under the premise that have no effects on the microstructure of ADI, we used the cathodic arc deposition (CAD) to deposit TiCrN multilayers for improving ADI’s suface properties. Before the CAD treatment, we deposited electroless Nickel (ENi) as interlayer to reduce the hardness gradient between film and substrate, and compared the surface properties of TiCrN multilayers (-100V, -150V, -200V) with CrN and TiN films.
The results showed that because ENi could fill up the hole-defects on ADI’s surface, resulting in enhancing the adhesion quality and load-carrying ability. For the mechanical characteristics and corrosion resistance, TiCrN multilayers are better than CrN and TiN films. Especially, the condition of -150V bias could obtain the best adhesion quality and plastic deformation resistance (H3/E2=0.218 GPa). The chromium atomic percent ratio Cr/(Cr+Ti) at -150V bias is 33.8% to denote that the coatings were homogeneous, and had the proper residual stress (σ=-10.5 GPa) to enhance the power of plastic deformation resistance and decrease the friction coefficient. For the corrosion resistance, the use of -150V bias has the lowest weight loss, so it is the best in corrosion resistance.
Advisor Committee Cheng-Hsun Hsu - advisor
Geng-Liang Ou - co-chair
Ko-Shao Chen - co-chair
Wei-Yu Ho - co-chair
Files Date of Defense 2010-07-29 Date of Submission 2010-08-11