Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Adhesion Improvements of $TiB_2$ Coatings on Nitrided AlSl H13 Steel

$TiB_2$ 코팅의 접착력 향상을 위한 AlSl H13 steel의 질화처리

  • Park Bohwan (School of Mater. Sci. Eng., Seoul National University) ;
  • Jung Dong-Ha (School of Mater. Sci. Eng., Seoul National University) ;
  • Kim Hoon (School of Mater. Sci. Eng., Seoul National University) ;
  • Lee Jung-Joong (School of Mater. Sci. Eng., Seoul National University)
  • 박보환 (서울대학교 재료공학부) ;
  • 정동하 (서울대학교 재료공학부) ;
  • 김훈 (서울대학교 재료공학부) ;
  • 이정중 (서울대학교 재료공학부)
  • Published : 2005.04.01
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Abstract

This study investigated the effect of nitriding on the hardness and adhesion properties of $TiB_2$ coatings. Inductively coupled plasma (ICP) was used for both nitriding and deposition. By applying ICP, H13 steel was nitrided at a high rate of $50\;{\mu}m/hr$. After nitriding, a Fe4N compound layer or a diffusion layer was formed according to the hydrogen/nitrogen ratio. Both layers could improve the load-bearing capacity of the substrate by increasing the substrate hardness. The adhesion of the $TiB_2$ coatings increased to $\~30N$ after nitriding, but the hardness of the coating was lowered to 20-30 GPa. However, the adhesion of the $TiB_2$ coatings with a high hardness (>60 GPa) could not be improved substantially by nitriding due to the large difference in hardness between the coating and the substrate. The grain size of the $TiB_2$ coating was larger on the nitrided substrates, resulting in a decrease in the hardness of the coating.

Keywords

References

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