Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Manufacturing and Properties of Low Vacuum Plasma Sprayed W-Carbide Hybrid Coating Layer

진공 플라즈마 스프레이 공정을 이용한 W계 복합 코팅층의 제조 및 특성 연구

  • Cho, Jin-Hyeon (School of Advanced Materials Engineering, Andong National University) ;
  • Jin, Young-Min (School of Advanced Materials Engineering, Andong National University) ;
  • Ahn, Jee-Hoon (Hybrid Materials Processing Research Department, RIST) ;
  • Lee, Kee-Ahn (School of Advanced Materials Engineering, Andong National University)
  • 조진현 (안동대학교 신소재공학부) ;
  • 진영민 (안동대학교 신소재공학부) ;
  • 안지훈 (포항산업과학연구원 융합공정연구본부) ;
  • 이기안 (안동대학교 신소재공학부)
  • Received : 2011.02.14
  • Accepted : 2011.04.22
  • Published : 2011.06.28
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Abstract

W-ZrC and W-HfC composite powders were fabricated by the Plasma Alloying & Spheroidization (PAS) method and the powders were sprayed into hybrid coating layers by using Low Vacuum Plasma Spray (LVPS) process, respectively. Microstructure, mechanical properties, and ablation characteristics of the fabricated coating layers were investigated. The LVPS process led to successful production of W-Carbide hybrid coatings, approximately 400 ${\mu}M$ or above in thickness. As the substrate preheating temperature increased from $870^{\circ}C$ to $917^{\circ}C$, the hardness of the W-ZrC coating layer increased due to decreased porosity. Vickers hardness showed higher value (about 108.4 HV) in W-ZrC hybrid coating material compared to that of W-HfC while adhesive strength was found to be similar in both coating layers. The plasma torch test revealed good ablation resistance of the W-Carbide hybrid coating layers. The relatively high performance W-ZrC coating layer at the elevated temperature is thought to be attributed to both the strengthening effect of ZrC particle remained in the layer and the formation of ZrO2 phase with high temperature stability.

Keywords

References

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