Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
권호 표지

Characteristics of the HVOF_sprayed $\textrm{Cr}_{3}\textrm{C}_{2}$-NiCr Coationg Layer

HVOF 용사된 $\textrm{Cr}_{3}\textrm{C}_{2}$-NiCr 용사층의 특성

  • Kim, Byeong-Hui (Dept. of Materials Engineering, Chungnam National University) ;
  • Seo, Dong-Su (Dept. of Materials Engineering, Chungnam National University)
  • 김병희 (충남대학교 공과대학 재료공학과) ;
  • 서동수 (충남대학교 공과대학 재료공학과)
  • Published : 1998.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

The purpose of this study was performed to compare to the characteristics (microstructure, phase change and hardness, erosion rate) of HVOF sprayed coatings with 20wt% NiCr claded and 7wt%NiCr mixed $\textrm{Cr}_{3}\textrm{C}_{2}$ powder. In the case of the 20wt% NiCr claded $\textrm{Cr}_{3}\textrm{C}_{2}$ powder, microstructural feature showed that the primary $\textrm{Cr}_{3}\textrm{C}_{2}$ was remained in the coating but was barely remained in the mixed $\textrm{Cr}_{3}\textrm{C}_{2}$ coating. As a results of XRD analysis, both 20wt%NiCr claded and 7wt% NiCr mixed $\textrm{Cr}_{3}\textrm{C}_{2}$ powder was decomposed during spraying but the degree of decomposition of the 20wt%NiCr claded was lower than 7wt%NiCr mixed $\textrm{Cr}_{3}\textrm{C}_{2}$ powder. After spraying the mixed powder for microhardness was higher than claded $\textrm{Cr}_{3}\textrm{C}_{2}$ powder and which was increased up to $\textrm{Hv}_{300}$= 1665 after heat treatment to $1000^{\circ}C$. however. 20wt%NiCr claded $\textrm{Cr}_{3}\textrm{C}_{2}$ became to decrease at $600^{\circ}C$ which was the maximum.

20wt%NiCr이 크래드된 크롬카바이드 분말과 7wt%NiCr이 기계적으로 혼합된 크롬카바이드 분말을 이용하여 HVOF 용사된 용사층의 특성(미세조직, 결정상, 경도값 그리고 erosion rate)을 비교하였다. 용사상태의 미세조직강의 특성은 크래드분말의 경우에 primary $\textrm{Cr}_{3}\textrm{C}_{2}$상이 용사층에는 남아 있었으나 혼합분말의 경우에는 primary $\textrm{Cr}_{3}\textrm{C}_{2}$ 상은 용사층에 거의존재하지 않았다. 또한 XRD 분석결과 두 분말 모두 용사과정에서 크롬카바이드의 분해는 일어났으나 분해율은 크래드분말의 경우가 혼합분말보다 낮았다. 용사상태에서 경도값은 혼합분말의 경우가 높았으며 $1000^{\circ}C$까지 열처리 후 혼합분말의 경도값은 1665까지 증가하였으나 크래드분말은 $600^{\circ}C$를 정점으로 감소하는 경향을 보였다.

Keywords

References

  1. Thermal Spray:Practical Solution for Engineering Problems S.Zimmermann;H.Kreye
  2. Thermal Spray:Practical Solution for Engineering Problems H.Kreye(et al.)
  3. Ph. D. Dissertation S.Rangaswamy
  4. Practical Solution for Engineering Problems D.R.Sielski;P.Sahoo
  5. Materials and Processess v.4 no.91 D.W.Parker(et al.)
  6. 日本溶射協會第59回全國大會講演論文集 Yasuo,Shimizu
  7. Thin Solid Films v.53 G.Y.La
  8. Expert Verl. Wear and Corrison Resistant Coatings by CVD and PVD Hans K.Pulker;et al.
  9. Thermal Spray Industrial Applications G,Iron;W.R.Kratochvil;A.Roy
  10. Thermal Spray:Practical Solution for Engineering Problems L.M.Berger;W.Hermel;A.Roy
  11. Thermal Spray, Practical Solution for Engineering Problems R.Schwetzke;H.Kreye
  12. J. of KWS v.15 no.1 B.H.Kim;D.S.Suhr
  13. J. of MRSK v.7 no.11 B.H.Kim;D.S.Suhr
  14. J. of KWS v.15 no.4 B.H.Kim;D.S.Suhr
  15. Thin Solid Films v.45 H.R.Eschnauer;O.Knotek
  16. Wear v.35 A.W.Ruff;L.K.Ives
  17. Thermal Spray Industrial Applications K.G.Shaw
  18. 溶接學全國大會講演槪要第56集 Yoshito,Koga;Keissku,Ogi;Kazuhiro,Nishizono
  19. Russian Journal of Physical Chemistrty v.35 no.2 T.Ya.Kosolapova;G.V.Samsonov
  20. Soviet Powder Metallurgy and Metal Ceramics v.12 no.4 Voitoich;R.F.;Pagach,E.A.
  21. Cemented Carbide Paul,Schwarzkope;Richard,Kieffer
  22. JPRS Translation 17499 Soviet Studies of Powder Merallurgy V.V.Grigoryeva;V.N.Klimenko
  23. J. of American Ceramic Society v.33 L.S.Foster;L.W.Forbes