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URN etd-0808112-023700 Statistics This thesis had been viewed 1833 times. Download 281 times. Author Yi-ching Pan Author's Email Address No Public. Department Materials Engineering Year 2011 Semester 2 Degree Master Type of Document Master's Thesis Language Chinese&English Page Count 98 Title Study on low-temperature duplex surface modification and characteristics of copper alloyed austempered ductile iron Keyword Copper alloyed austempered ductile iron Electroless nickel CrN/ZrN multilayer Friction coefficients Corrosion resistance Corrosion resistance Friction coefficients CrN/ZrN multilayer Electroless nickel Copper alloyed austempered ductile iron Abstract copper alloyed austempered ductile iron (Cu-ADI) has been widely applied in the industry because it has some dramatic advantages such as high strength, wear resistance, and low cost. However, the Cu-ADI’s surface from the phenomenon of the nodular graphite peeled off. Results in the deterioration of surface property. In this study, we used Electroless nicke (EN) as interlayer to avoid hole-defect on the surface, and then deposited CrN/ZrN multilayer by using cathodic arc deposition (CAD) technique.
Coating morphology and structure were analyzed by using SEM, XRD, and TEM. Moreover Adhesion test, Solid particle erosion test, nanoindention test, wear test, polarization test, and immersion test were all performed for understanding coating properties. The results showed that EN is a mixed structure of crystalline and amorphous while the (Cr,Zr)N film is a multilayer type with a F.C.C structure. The EN-ZrN has the highest hardness and the lowest friction coefficient (0.21) . On the other hand , the EN-CrN has the best performance in corrosion resistance. In addition, the EN-CrZrN multilayer was wear and corrosion resistance; it was the best possesses both the functions of corrosion resistance and wear resistance.
Advisor Committee Cheng-Hsun Hsu - advisor
Chung-Kwei Lin - co-chair
Keng-Liang Ou - co-chair
Ko-Shao Chen - co-chair
Files Date of Defense 2012-07-18 Date of Submission 2012-08-08