Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Influence of the Duty Cycle on the Characteristics of Al2O3 Coatings Formed on the Al-1050 by Plasma Electrolytic Oxidation

Al-1050 위에 플라즈마 전해 산화법으로 형성된 Al2O3 피막 특성에 미치는 듀티사이클의 영향

  • Nam, Kyung-Su (Departmemt of Materials Engineering, Graduate School of PaiChai University) ;
  • Moon, Jung-In (Departmemt of Materials Engineering, Graduate School of PaiChai University) ;
  • Kongsy, Phimmavong (Departmemt of Materials Engineering, Graduate School of PaiChai University) ;
  • Song, Jeong-Hwan (Departmemt of Information & Electronic Materials Engineering, PaiChai University) ;
  • Lim, Dae-Young (Departmemt of Information & Electronic Materials Engineering, PaiChai University)
  • 남경수 (배재대학교 대학원 재료공학과) ;
  • 문정인 (배재대학교 대학원 재료공학과) ;
  • 피마봉 껑씨 (배재대학교 대학원 재료공학과) ;
  • 송정환 (배재대학교 정보전자소재공학과) ;
  • 임대영 (배재대학교 정보전자소재공학과)
  • Received : 2013.02.14
  • Accepted : 2013.03.19
  • Published : 2013.03.31
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Abstract

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.

Keywords

References

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