This study investigates the microstructure and wear properties of cermet (ceramic + metal) coating materials manufactured using high velocity oxygen fuel (HVOF) process. Three types of HVOF coating layers are formed by depositing WC-12Co, WC-20Cr-7Ni, and Cr3C2-20NiCr (wt.%) powders on S45C steel substrate. The porosities of the coating layers are 1 ± 0.5% for all three specimens. Microstructural analysis confirms the formation of second carbide phases of W2C, Co6W6C, and Cr7C3 owing to decarburizing of WC phases on WC-based coating layers. In the case of WC-12Co coating, which has a high ratio of W2C phase with high brittleness, the interface property between the carbide and the metal binder slightly decreases. In the Cr3C2-20CrNi coating layer, decarburizing almost does not occur, but fine cavities exist between the splats. The wear loss occurs in the descending order of Cr3C2-20NiCr, WC-12Co, and WC-20Cr-7Ni, where WC-20Cr-7Ni achieves the highest wear resistance property. It can be inferred that the ratio of the carbide and the binding properties between carbide–binder and binder–binder in a cermet coating material manufactured with HVOF as the primary factors determine the wear properties of the cermet coating material.

Abstract
 1. 서 론
 2. 실험방법
 3. 결과 및 고찰
  3.1 WC계 및 Cr3C2계 cermet 코팅층의 초기 미세조직
  3.2 WC계 및 Cr3C2계 cermet 코팅층의 마모 특성
 4. 결 론
 References

• 강연지(인하대학교 신소재공학과) | Yeon-Ji Kang (Department of Materials Science & Engineering, Inha University)
• 함기수(인하대학교 신소재공학과) | Gi-Su Ham (Department of Materials Science & Engineering, Inha University)
• 김형준(포항산업과학연구원) | Hyung-Jun Kim (Research Industrials Science & Technology, Pohang)
• 윤상훈(포항산업과학연구원) | Sang-Hoon Yoon (Research Industrials Science & Technology, Pohang)
• 이기안(인하대학교 신소재공학과) | Kee-Ahn Lee (Department of Materials Science & Engineering, Inha University) Corresponding Author