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URN etd-0810110-143107 Statistics This thesis had been viewed 2930 times. Download 665 times. Author Chi-Yu Chang Author's Email Address No Public. Department Materials Engineering Year 2009 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 117 Title CO2 Flow Rate and Bias Effects on Characteristics of AISI 304 Stainless Steel Arc-deposited Cr-C-O Composite Coatings Keyword Erosion resistance Corrosion resistance Wear resistance Cathodic vacuum arc deposition AISI 304 stainless steel CO2 Cr-C-O composite coatings Cr-C-O composite coatings CO2 AISI 304 stainless steel Cathodic vacuum arc deposition Wear resistance Corrosion resistance Erosion resistance Abstract In this study, the Cr-C-O composite coatings were synthesized on AISI 304 stainless steel substrate by cathodic vacuum arc (CVA) deposition system using CO2 reactive gas and Chromium (99%) target. In the process, we try to vary the CO2 flow rate and the bias as the coating parameters, and the coating morphologies and properties such as roughness, chemical composition, structure, and adhesion were all analyzed. Moreover, polarization tests, immersion tests, wear tests, and erosion tests were also performed for exploring the effects of bias and CO2 flow rate on the coated AISI 304 stainless steel.
The experiment results showed that the Cr-C-O composite coatings can improve the properties of AISI 304 stainless steel, such as wear resistance and corrosion resistance. In the aspect of corrosion behaviors, the polarization test and immersion test showed that the coatings have the best quality at 40sccm with -150V. At the same parameter, due to a higher value of H/E and the best adhesion, it also has a well performance in wear test and wet erosion test. In conclusions, the Cr-C-O coated specimens can improve the properties of AISI 304 stainless steel.
Advisor Committee Cheng-Hsun Hsu - advisor
Files Date of Defense 2010-07-22 Date of Submission 2010-08-11