ORAL
| SESSION: CompositeWedAM-R9 | 5th Intl. Symp. on Composite, Ceramic and Nano Materials Processing, Characterization and Applications |
| Wed Oct, 25 2017 | Room: Condesa III |
| Session Chairs: Fumio Ogawa; Kamlesh Phapale; Session Monitor: TBA |
15:00: [CompositeWedAM06]
Deposition of Metals on Vapor Grown Carbon Fibers via in-situ Chemical Vapor Deposition and Fabrication of Metal Matrix Composites Utilizing Coated Fibers Fumio
Ogawa1 ; Chitoshi
Masuda
2 ; Hidetoshi
Fujii
3 ;
1Ritsumeikan University, Kusatsu, Japan;
2Kagami Memorial Institute for Materials Science and Technology, Waseda University, Shinjuku-ku, Japan;
3Joining and Welding Research Institute, Osaka University, Ibaraki, Japan;
Paper Id: 238
[Abstract] Aluminum, nickel, silicon and titanium were deposited on the surface of vapor grown carbon fibers (VGCFs) via simple and cost effective in situ chemical vapor deposition (in situ CVD) utilizing iodine to transport metallic atoms. For aluminum coating, coating layer was formed by annealing at 500oC. It was confirmed that metallic aluminum layers were almost homogeneously formed on VGCFs. Aluminum matrix composites reinforced by aluminum-coated VGCFs were fabricated via powder metallurgy (PM). Tensile strength of aluminum matrix composites was improved by coating treatment. For nickel coating, coating layer was formed by annealing at 600oC. It was found that metallic nickel coating that consisted of grains with the size of ~5 nm was formed. The wettability of sheets consisting of nickel-coated VGCFs by molten aluminum was investigated. It was apparent that the wettability was improved by the coating treatment. Aluminum matrix composites containing nickel-coated VGCFs were fabricated via hot extrusion of mixed powder of Al-7Si and VGCFs at semi-solid temperature. It was found that Vickers microhardness values were improved owing to nickel coating treatment of VGCFs because of improved interaction of aluminum matrix and VGCFs at the interface. For silicon coating, coating layer was formed by annealing at 1100oC. Coating layer consisted of metallic silicon, although the surface of the coating layer was oxidized. For titanium coating, reaction of VGCFs with titanium and conversion of VGCF surface into titanium carbide (TiC) was confirmed. It was also found that the extent of reaction could be varied by the amount of iodine, annealing temperature and annealing duration.
