내경 플라즈마 용사법에 의한 과공정 Al-Si 합금의 실린더 블록 보어 개발을 위한 기초연구

김병희; 이형근; 김혜성; Byeong-Hui Kim; Hyeong-Geun Lee; Hye-Seong Kim

Korean Journal of Materials Research, Vol.11, No.11, 965-971, November, 2001

Basic Research for Development of Hypereutectic Al-Si Alloyed Cylinder Block Bore by Plasma Spraying System for Internal Diameters

김병희^†, 이형근¹, 김혜성²

충남대학교 재료공학과
¹한밭대학교 생산가공공학과
²밀양대학교 재료공학과

Byeong-Hui Kim^†, Hyeong-Geun Lee¹, and Hye-Seong Kim²

Department of Materials Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon, 305-764, Korea
¹Dept. of Welding and Production Engineering, Hanbat National University, Daejon, 300-717, Korea
²Dept. of Materials Engineering, Miryang National University, 1025-1, Naei-Dong, Miryang, Kyngnam, 627-702, Korea

E-mail:

The objective of this study is to investigate the characteristics - microstructure, hardness, adhesive strength and friction coefficient - of the coatings with aging - treatment after optimizing internal- plasma spraying parameters for Al-30wt%Si powder as a basic research to manufacture the cylinder block bore for Al engine composed of Al-30wt%Si alloy on Al alloy, The optimum internal-plasma spraying parameters of Al-30wt%Si alloy are summarized as follows: voltage: 37.5V, current: 160A, working distance: 25mm, gun traverse speed: 4.5mm/s, rotating speed: 518m/min. The primary Si particles grew aggressively with increasing heat-treating temperature. The hardness of the as-sprayed coating was about Hv=275 but this value was abruptly decreased with increasing heat-treating temperature. And average friction coefficient of the coating was below 0.08 after heat treatment for 48h at 175 ? C .

Keywords:internal-plasma spraying;Al-30wt%Si powder;microstructure;hardness;friction coefficient

[References]

Wuest G, Barbezat G, Keller S, SAE Technical Paper Series 970016, pp.33 (1997) (1997)
Rao VDN, Kabat DM, Rose R, Leong DY, Automotive Eng., 57 (1997)
Rao VDN, Kabat DM, Wuest G, SAE Technical Paper Series 970023 (1997) (1997)
McCune RC, Welding. J., 41 (1995)
Barbezat G, Wuest G, Surf. Eng., 13(2), 113 (1998)
이형근, 김병희, Report 99-I-01-03-A-068, 과학기술부 (2001) (2001)
ASTM C 633-79, ASTM (1980) (1980)

[1] Wuest G, Barbezat G, Keller S, SAE Technical Paper Series 970016, pp.33 (1997) (1997)

[2] Rao VDN, Kabat DM, Rose R, Leong DY, Automotive Eng., 57 (1997)

[3] Rao VDN, Kabat DM, Wuest G, SAE Technical Paper Series 970023 (1997) (1997)

[4] McCune RC, Welding. J., 41 (1995)

[5] Barbezat G, Wuest G, Surf. Eng., 13(2), 113 (1998)

[6] 이형근, 김병희, Report 99-I-01-03-A-068, 과학기술부 (2001) (2001)

[7] ASTM C 633-79, ASTM (1980) (1980)