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Tribological properties of carbon fiber-reinforced aluminum composites processed by spark plasma sintering
Ki Hoon Jung, Seungjin Nam, Sung-Soo Kang, Bon-Cheol Ku, Yun Hyuk Bang, Jun Yeon Hwang 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 14 103-106 (4 pages)
of preventing grain growth during the high temperature sintering process. Thus, the mechanical properties of the sintered material is improved. Here, the SPS was carried out under vacuum where the time for sintering is noticeably faster than the conventional methods. The ball milling process was used to uniformly disperse CFs throughout the Al particles. Afterwards, we analyzed the synthesized... The resulting polyacrylonitrile-based CFs are still used in a wide-variety of applications since they exhibit excellent elasticity with strength 10 times higher and density 1/5 less than those of steel. Aluminum (Al), on the other hand, is commonly used as an engineering material since it is abundant on the earth’s crust and is lightweight (2.7 g/cm3). Additionally, it can easily form an alloy with other metals at low or high temperatures with high ductility and corrosion resistance [4]. -
Hot Isostatic Pressing 기술을 이용한 유해폐기물 안정화기술 고찰
이동대, 손인철 한국열환경공학회 한국열환경공학회 학술대회지 3 Pages
한국열환경공학회 한국열환경공학회 학술대회지 2017년 춘계 41 253-255 (3 pages)
of a sintering (powder metallurgy) process and for fabrication of metal matrix composites. keyword: Hot Isostatic Pressing (HIP), ANSTO, Calcined waste 2017 년도 춘계 학술발표회 논문집 포스터논문 발표 사단법인 한국열환경공학회 ..PAGE:2 - 254 - I. 서론 HIP 기술은 금속·세라믹 재료의 기공을 제거하고 밀도를 높여 기계적인 특성과 적용 성을 개선시키는 공정이다. Fig. 1의 왼쪽 그림에서 보듯이 압력용기에... HIP 기술은 금속·세라믹 재료의 기공을 제거하고 밀도를 높여 기계적인 특성과 적용 성을 개선시키는 공정이다. Fig. 1의 왼쪽 그림에서 보듯이 압력용기에 불활성가스(알곤 등)를 충진하고 고온고압의 환경을 조성하여 모든 방향에서 균일하게 압력과 온도가 작용하는 기술이다. 불활성가스를 사용하므로 내용물은 화학적으로 반응하지 않게되는 특징이 있다. HIP 기술의 기본 파라미터는 온도, 압력, 시간, 처리가스의 종류 등이 해 당된다. -
SiC 전환 카본 제거공정에 대한 CFD 해석
Poudel Jeeban, 임대원, 권우택, 오세천 한국열환경공학회 열환경공학 8 Pages
한국열환경공학회 열환경공학 2014, 제 11권 1호 6 42-49 (8 pages)
powder from the Si Waste of Solar Cell Industry,” J. of Korean Inst. of Resources Recycling, 19, pp.44-49(2010). [10] Huang, Z.H., Jia, D.C., Zhou, Y., Liu, Y.G., "A new sintering additive for silicon carbide ceramic,”Ceramic International, 29, pp. 13- 17(2003). [11] Prochazka, S., "The role of boron and carbon in the sintering of silicon carbide, in: P. Popper(Ed.),”Special Ceramics, 6... -
Graphene accelerates osteoblast attachment and biomineralization
Jia Ren, Xiaogang Zhang, Yao Chen 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 5 42-47 (6 pages)
recognized as a promising material in this feld [12-15]. In our previous work [12,13], we reported on the fracture toughness of graphene reinforced HA composite synthesized using spark plasma sintering, which exhibited an ~80% improvement compared to pure HA, even when the added graphene was only 1.0% weight. For biomaterials used in orthopedic applications, cell attachment is an initial... In this paper, the in vitro biocompatibility of graphene film (GF) with osteoblasts was evaluated through cell adhesion, viability, alkaline phosphatase activity, F-actin and vinculin expressions, versus graphite paper as a reference material. The results showed that MG-63 cells exhibited stronger cell adhesion, better proliferation and viability on GF, and osteoblasts cultured on GF exhibited vinculin expression throughout the cell body. The rougher and wrinkled surface morphology, higher... -
Three-dimensional porous graphene materials for environmental applications
Muruganantham Rethinasabapathy, Sung-Min Kang, Sung-Chan Jang, Yun Suk Huh 한국탄소학회 Carbon Letters 13 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 1 1-13 (13 pages)
of low viscosity Newtonian GO suspensions, allowing a GA architecture with ultralow den- sity to be printed. Chakravarty et al. [47] reported the use of a simple, cost- effective spark plasma sintering technique as a possible method for welding graphene sheets into 3D scaffolds. The developed scaffolds possess a highly porous, ultra-low dense, interconnected, layered, open microstructure with... graphene oxide-based networks have attracted considerable attention because they offer low density, high porosity, large surface area, excellent electrical conductivity and stable mechanical properties. Water pollution and associated environmental issues have become a hot topic in recent years. Rapid industrialization has led to a massive increase in the amount of wastewater that industries discharge into the environment. Water pollution is caused by oil spills, heavy metals, dyes, and organic... -
Formation of nanojoints between carbon nanotubes and copper nanoparticles
Jagjiwan Mittal, Kwang Lung Lin 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 11 86-92 (7 pages)
and lled MWCNT. ..PAGE:3 Carbon Letters Vol. 21, 86-92 (2017) DOI: http://dx.doi.org/10.5714/CL.2017.21.086 88 graphs of the Cu nanoparticles, which have diameters in the range of 1015 nm. The sintering of the Cu nanoparticles takes place when particles are heated to 250°C [20], as shown in Fig. 2d. The HRTEM micrographs in Fig. 2e demonstrate the formation of an interconnect after heating... nanotubes (CNTs) a promising candidate for future applications in the electronic industry [1-3]. Because of their smaller dimensions and higher conductivity as compared to copper, multi-walled carbon nanotubes (MWCNT) may increase the bandwidth density of global interconnects [4]. They demonstrate charge carrier mean free paths between 500 nm and 10 μm as compared to 40 nm in metals. CNTs can carry exceptionally high current densities of up to 1010 A cm?2 even at elevated temperatures [5,6].... -
Electrochemical synthesis of nanosized hydroxyapatite/graphene composite powder
Vesna Mi?kovi?-Stankovi?, Sanja Erakovi?, Ana Jankovi?, Maja Vuka?inovi?-Sekuli?, Miodrag Mitri?, Young Chan Jung, Soo Jin Park, Kyong 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.4 2 233-240 (8 pages)
parameters approach to X- ray line-profle ftting. J Appl Crystallogr, 25, 109 (1992). http:// dx.doi.org/10.1107/S0021889891010804. [33] Mostafa NY. Characterization, thermal stability and sintering of hydroxyapatite powders prepared by different routes. Mater Chem Phys, 94, 333 (2005). http://dx.doi.org/10.1016/j.matchemp- hys.2005.05.011. [34] Ouyang Y, Chen L. Surface-enhanced Raman... implant (scaffold). The synthesis was performed in a homogeneous dispersion containing Na2H2EDTA·2H2O, NaH2PO4 and CaCl2 with a Ca/EDTA/PO4 3? concentration ratio of 0.25/0.25/0.15M, along with 0.01 wt% added graphene nanosheets, at a current density of 137 mA cm?2 and pH value of 9.0. The field emission scanning electron microscopy and transmission electron microscopy observations of the composite HAP/Gr powder indicated that nanosized hydroxyapatite particles were uniformly placed in the...