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2016 Vol.26, Issue 5
Effects of Powder Melting Degree on Microstructural Features of Plasma Sprayed Y2O3 Coating

플라즈마 제트에서의 분말 용융특성에 따른 Y2O3 코팅층의 미세조직 형성거동

Sang-Woon Kang
,
Kyeong-Ho Baik†
강 상운
,
백 경호†
Department of Materials Science and Engineering, Chungnam National University 99 Daehagro, Yuseong, Daejeon, 34134, Republic of Korea
충남대학교 신소재공학과
†Corresponding author khbaik@cnu.ac.kr (K.-H. Baik, Chungnam Nat'l Univ.)
May 2016. pp. 229-234
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Abstract

In this study, the degree of particle melting in Y2O3 plasma spraying and its effects on coating characteristics have been investigated in terms of microstructural features, microhardness and scratch resistance. Plasma sprayed Y2O3 coatings were formed using two different powder feeding systems: a system in which the powder is fed inside the plasma gun and a system in which the powder is fed externally. The internal powder spraying method generated a well-defined lamellae structure that was characterized by a thin porous layer at the splat boundary and microcracks within individual splats. Such micro-defects were generated by the large thermal contraction of splats from fully-molten droplets. The external powder spraying method formed a relatively dense coating with a particulate deposition mode, and the deposition of a higher fraction of partially-melted droplets led to a much reduced number of inter-splat pores and intra-splat microcracks. The microhardness and scratch resistance of the Y2O3 coatings were improved by external powder spraying; this result was mainly attributed to the reduced number of micro-defects.

Keywords
Y2O3
plasma spraying
powder melting
inter-splat pore
scratch resistance
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 26
  • No :5
  • Pages :229-234
  • Received Date : 2016-03-08
  • Revised Date : 2016-04-01
  • Accepted Date : 2016-04-05
  • DOI :https://doi.org/10.3740/MRSK.2016.26.5.229
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