한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제51권5호
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  • Pages.297-302
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  • 2018
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
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304 스테인레스강의 고착방지성능 향상을 위한 Sn-Al 열 확산 코팅 기술 개발

Development of Sn-Al Thermal Diffusion Coating Technology for Improving Anti-Galling Characteristics of 304 Stainless Steel

  • 황주나 (한국교통대학교 항공기계설계학과) ;
  • 강성훈 ;
  • 조성필 (한국교통대학교 4D바이오소재센터) ;
  • 정희종 (주식회사 바이브록) ;
  • 김동욱 (주식회사 바이브록) ;
  • 이방희 (주식회사 바이브록) ;
  • 황준 (한국교통대학교 항공기계설계학과) ;
  • 이용규 (한국교통대학교 4D바이오소재센터)
  • Hwang, Ju-Na (Dept. of Aeronautical & Mechanical Design Engineering, Korea National University of Transportation) ;
  • Kang, Sung-Hun (KB-Biomed) ;
  • Cho, Sungpil (4D Biomaterials Center, Korea National University of Transportation) ;
  • Jeong, Hui-Jong (Viblock Co. Ltd.) ;
  • Kim, Dong-Uk (Viblock Co. Ltd.) ;
  • Lee, Bang-Hui (Viblock Co. Ltd.) ;
  • Hwang, Jun (Dept. of Aeronautical & Mechanical Design Engineering, Korea National University of Transportation) ;
  • Lee, Yong-Kyu (4D Biomaterials Center, Korea National University of Transportation)
  • 투고 : 2018.08.30
  • 심사 : 2018.09.27
  • 발행 : 2018.10.31
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초록

The important drawback of hardware fasteners consisted of 304 stainless steel (STS) is a frequent galling caused by a combination of friction and adhesion between the sliding surface. To improve the anti-galling effect, Sn-Al coatings by a thermal diffusion have been developed. The thermal diffusion by pack cementation with an $AlCl_3$ activator at $250^{\circ}C$ for 1 hour produced an Sn-Al alloy coating layer with an average thickness of $9.9{\pm}0.5{\mu}m$ on the surface of 304 STS fasteners. Compared with the galling frequency of the 304 STS fasteners, Sn-Al coatings on the surface of 304 STS fasteners demonstrated about 2.8-time reduction of the galling frequency.

키워드

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Fig 1. Comparison of Sn-Al content by activator.

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Fig 3. SEM images of 304 stainless steel nut before/after Sn-Al thermal diffusion coating and EDS analysis of coated specimen. (a) uncoated(surface) (b) coated (surface) (c) coated(cross-section) (d-f) EDS results of (a), (b), (c) respectively.

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Fig 2. Formation mechanism of Sn-Al thermal diffusion coating layer using pack cementation method [3].

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Fig 4. XRD patterns of Sn, Al powder and Sn-Al thermal diffusion coated 304 STS substrate.

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Fig 5. Coating thickness of Sn-Al thermal diffusion coated specimens. (a) the graph of coating thickness with processing temperature and time (b) SEM image of T3 condition(Table 3)

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Fig 6. Sectional view of the test configuration and the test apparatus for measuring galling resistance.

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Fig 7. Result of galling test. (a) Galling frequency as a function of applied stress (b) galled test specimens.

Table 1. Chemical composition of 304 STS(substrate) (wt %)

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Table 2. The ratios of Sn-Al thermal diffusion coating mixture powder (wt %)

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Table 3. Test condition of Sn-Al thermal diffusion coating

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