| 학회 | 한국재료학회 |
| 학술대회 | 2014년 가을 (11/27 ~ 11/28, 대전컨벤션센터) |
| 권호 | 20권 2호 |
| 발표분야 | E. 구조 재료(Structural Materials) |
| 제목 | Surface Modification of Metal/Ceramics by laser texturing to reduce friction and wear at lubricating environment |
| 초록 | Hemispherical dimples with diameter, ø = 60 µm and depth, d= 30 µm were created on the metal and ceramics surfaces using INYA-20 watts Laser of 1064 nm wavelength. Dimple spacing of 80-200 µm with dimple density variation ranging from 44-7 % were attained on the surfaces of grey cast iron (internal combustion engine), Al2O3-ZrO2/Al2O3-ZrO2-CaF2(3 wt%) composites and Sialon ceramics. Ceramic composites were fabricated by using hot-press sintering technique. Surface topography was analyzed by using roughness measurement, scanning electron microscopy (SEM), and optical microscopy. Friction and wear characteristics were analyzed on textured surfaces at lubricating environment to observe the effect of surface texturing on reduction of friction and wear. Reduction on coefficient of friction was achieved by more than 70% for both metals and ceramics, due to the duality of dimples as wear (debris) traps and lubricant reservoirs. Wear reduced significantly for the textured surface as compared to the polished surface. Effect of variation of sliding speed and applied load on friction of textured surfaces was also studied. The lowest coefficient of friction was found for 15N and 5 cm/s within the observed range of load and speed, respectively. |
| 저자 | Khagendra Tripathi1, Bhupendra Joshi2, Gobinda Gyawali1, Seung-Ho Kim2, Soo Wohn Lee1 |
| 소속 | 1Research Center for Eco Multi-Functional Nano Materials, 2Sun Moon Univ. |
| 키워드 | Laser surface texturing; Grey cast iron; Sialon ceramics; Friction; Wear |
