지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2014.7
- 수록면
- 20 - 28 (9page)
이용수
초록· 키워드
오류제보하기
The high velocity oxygen fuel spraying (HVOF) is a kind of surface modification process technology to form the sprayed coating layer after spraying the powder to molten or semi-molten state by the ultra-high speed at the high-temperature heat source and conflicting with a substrate. It is desirable to melt completely the thermal spray powder in order to produce the coating layer with an optimal adhesion, however, because a semi-molten powder in a spray process has the low efficiency and become a factor that degrades the mechanical property by the inducement of pore-forming within the coating layer. To improve the wear resistance, corrosion resistance and heat resistance, in this study, the plungers of high-speed and ultra-high pressure reciprocating hydraulic pumps for oil and water used in ironwork are produced with 420J2 and the coating layers of plungers are formed by the powders of WC-Co-Cr and WC-Cr-Ni including the high hardness WC. The surface of these plungers is modified by the super-mirror face grinding machine using variable air pressure developed in this laboratory, and then the characteristics of cross-sectional microstructure, and surface roughness and hardness values between no operation and 100 days-operation are examined and made a comparison. The fine tops and bottoms on surface roughness curve of oil-hydraulic pump plunger sprayed by WC-Cr-Ni are molded more and higher than those of water-hydraulic pump sprayed by WC-Co-Cr because the plunger diameter of oil-hydraulic pump is 0.4 times smaller than that of water-hydraulic pump and the pressure of oilhydraulic pump exerted on the plunger is operated with the 70 bars higher than that of water-hydraulic pump. As a result, it is found that the values of centerline average surface roughness and maximum height for oil-hydraulic pump plunger are bigger than those of water-hydraulic pump plunger.
목차
Abstract
1. 서론
2. 실험 장치 및 방법
3. 실험 결과 및 고찰
4. 결론
References
참고문헌 (11)
참고문헌 신청
1. [학술지(정기간행물)] - K. Tani / 2011 / Thermal Spraying Surface Modification and Its Interaction with Environment / Journal of the Japan Institute of Marine Engineering 46 (5) : 20 ~ 25
2. [보고서] - N. J. Brown / 1990 / Lapping: Polishing and Shear Mode Grinding : 24 ~ 29
3. [보고서] - P. A. Mikeen / 1990 / Ultra-precision, High Stiffness CNC Grinding Machines for Ductile Mode Grinding of Brittle Materials : 30 ~ 37
4. [학술지(정기간행물)] - H. Ohmori / 1990 / Mirror Surface Grinding of Silicon Wafers with Electrolytic Inprocess Dressing / Annals of the CIRP 39 : 329 ~ 332
5. [학술지(정기간행물)] - M. I. Bae / 1998 / Ultra-precision Finishing Characteristics of Coated Chrome Steel / Korea Society Manufacturing Technology Engineers 7 (6) : 97 ~ 101
2. [보고서] - N. J. Brown / 1990 / Lapping: Polishing and Shear Mode Grinding : 24 ~ 29
3. [보고서] - P. A. Mikeen / 1990 / Ultra-precision, High Stiffness CNC Grinding Machines for Ductile Mode Grinding of Brittle Materials : 30 ~ 37
4. [학술지(정기간행물)] - H. Ohmori / 1990 / Mirror Surface Grinding of Silicon Wafers with Electrolytic Inprocess Dressing / Annals of the CIRP 39 : 329 ~ 332
5. [학술지(정기간행물)] - M. I. Bae / 1998 / Ultra-precision Finishing Characteristics of Coated Chrome Steel / Korea Society Manufacturing Technology Engineers 7 (6) : 97 ~ 101
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UCI(KEPA) : I410-ECN-0101-2015-550-001689096