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J. Korean Ceram. Soc. > Volume 50(2); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(2): 108.
doi: https://doi.org/10.4191/kcers.2013.50.2.108
Al-1050 위에 플라즈마 전해 산화법으로 형성된 Al2O3 피막 특성에 미치는 듀티사이클의 영향
남경수, 문정인, 피마봉 껑씨, 송정환1, 임대영1
배재대학교 대학원 재료공학과
1배재대학교 정보전자소재공학과
Influence of the Duty Cycle on the Characteristics of Al2O3 Coatings Formed on the Al-1050 by Plasma Electrolytic Oxidation
Kyung-Su Nam, Jung-In Moon, Phimmavong Kongsy, Jeong-Hwan Song1, Dae-Young Lim1
Departmemt of Materials Engineering, Graduate School of PaiChai University
1Departmemt of Information & Electronic Materials Engineering, PaiChai University
Oxide coatings were prepared on Al-1050 substrates by an environment-friendly plasma electrolytic oxidation (PEO) process using an electrolytic solution of $Na_2SiO_3$ (8 g/L) and NaOH (3 g/L). The effects of three different duty cycles (20%, 40%, and 60%) and frequencies (50 Hz, 200 Hz, and 800 Hz) on the structure and micro-hardness of the oxide coatings were investigated. XRD analysis revealed that the oxides were mainly composed of ${alpha}-Al_2O_3$, ${gamma}-Al_2O_3$, and mullite. The proportion of each crystalline phase depended on various electrical parameters, such as duty cycle and frequency. SEM images indicated that the oxide coatings formed at a 60% duty cycle exhibited relatively coarser surfaces with larger pore sizes and sintering particles. However, the oxides prepared at a 20% duty cycle showed relatively smooth surfaces. The PEO treatment also resulted in a strong adhesion between the oxide coating and the substrate. The oxide coatings were found to improve the micro-hardness with the increase of duty cycle. The structural and physical properties of the oxide coatings were affected by the duty cycles.
Key words: PEO, Duty cycle, $Al_2O_3$ coating, Al-1050, Micro-hardness
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