| 학회 | 한국재료학회 |
| 학술대회 | 2012년 봄 (05/17 ~ 05/18, 무주덕유산리조트) |
| 권호 | 18권 1호 |
| 발표분야 | E. 구조 재료(Structural Materials) |
| 제목 | Fabrication and mechanical properties Of WC-Binder hard materials for FSW tool application by SPS method |
| 초록 | Friction stir welding(FSW) is a new solid-state joining process which uses frictional heat generated by a rotating and traversing cylindrical tool with a profiled pin along a square butt weld joint. FSW have considered to be the most significant development in metal joining in a decade. This welding process is quite efficient and environment friendly. Because there are no special pre-weld preparation; and no weld fumes occurrence as compared to other conventional welding method. FSW tool is obviously important to weld high strength aluminum alloys and other metallic alloys in FSW process. Especially the material of the FSW tool is a critical component to the success of the process. However, the FSW tool is subjected to severe stress and high temperatures for the welding of hard alloys such as steels and titanium alloys. The commercial application of FSW to these alloys is now limited by the high cost and short life of FSW tools. So it is important to develop a FSW tool which has the high hardness and the high toughness to weld mild steel or high strength plates. In this study the powder of WC–Carbide-Co composite was mixed by ball milling. The powder of tungsten carbide is used to make a bulk material for FSW tool. Because the tungsten carbide have high strength and fracture toughness. Each powder of Zirconium, Niobium and Titanium carbide are used as binders which can be used to inhibit grain growth. The Cobalt powder can decrease the sintering temperature as binder. The milled powder was placed in graphite die and then the sintering was processed by SPS. The spark plasma sintering(SPS) has emerged as a useful technique to density the powder like WC which has the high temperature melting point at relatively low temperatures and shorter times because of activating a high-voltage pulse current with the pressure between gaps in the powder. Densification by SPS is extremely fast compared to conventional sintering methods applying external pressure like Hot Pressure(HP) or Hot-Isostatic-Pressure(HIP). The sintering behavior of WC–Binders composite powder and mechanical properties of its sintered bulk materials were investigated in this study. The relative densities of the sintered-body were measured by the Archimedes method and the mixed powder, a sintered bulk material was analyzed through X-ray diffraction (XRD). Vickers hardness and fracture toughness of WC–Binders composite is investigated. |
| 저자 | 유정한1, 박현국2, 윤희준3, 방한서1, 방희선2, 오익현3 |
| 소속 | 1Korea Institute of Industrial Technology (KITECH), 2Automotive Components Group, 3Gwang-Ju |
| 키워드 | FSW; spark plasma sintering; hard metal; carbide |
