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기계적 합금화에 의한 Al-Fe 및 Al-Fe-Ce 합금의 고온 변형거동
김선진,이도인,안인섭,허보영,조권구 국립경상대학교 공과대학 부설 첨단소재연구소 1992 尖端素材 Vol.2 No.-
The deformation behavior of a mechanical alloyed Al-Fe and Al-Fe-Ce alloy was studied in the temperature range of 300℃ to 500℃. The steady state for Al-8wt.%Fe powder was obtained after 1000 minutes of mechanical alloying at the process condition of 2wt.% stearic acid, 46:1 of grinding media/powder weight ratio, and 300 rpm of impeller revolving velocity. The relative densities of Al-8wt.%Fe alloy powders reached almost 100% after 1 hour sintering at 470℃ under vacuum state. With increasing the amount of PCA, hardness of the sintered alloys increased but the relative densities were not affected. It was also found that decrease in hardness and tensile strength after high temperature aging treatment was reduced with increasing the amount of Ce addition.
安仁燮 慶尙大學校 1991 論文集 Vol.30 No.2
A new process called "Mechanical alloying(MA)" which produces homogeneous alloy particles with a uniformly dispersed internal structure has been used to make Al-8wt.% Fe alloys. The effects of the amount of precess control agent and mechanical alloying time on the microstructure and mechanical properties were investigated. Powders prepared by MA method was sintered by vacuum hot pressing. Workability was investigated with adding hot forging at 470℃. Hardness was increased with adding the amount of process control agent. The workability was limited to 26% at the 5 times hot forging and was increased as increasing relative density.
기계적합화법으로 제조된 TiNi 분말의 방전플라즈마 소결에 관한 연구
김윤호,강지훈,김지순,안인섭,권영순 울산대학교 1999 공학연구논문집 Vol.30 No.2
기계적합금화법(MA)에 의해 제조된 TiNi 분말을 사용하여 방전플라즈마 소결법(SPS)으로 소결체를 제조하고 치밀화 거동을 조사하기 위하여 미세조직의 관찰 및 상분석을 행하였다. SPS법으로 소결체를 제조한 결과, 통상적인 소결법으로 소결체를 제조하였을 때 보다, 낮은 온도와 짧은 시간의 유지시간에서 이론 밀도의 99% 가까운 소결체 밀도를 얻을 수 있었고, 소결체의 상은 B2구조의 cubic과 2차상으로 Ti₂Ni가 존재함을 확인하였다. Mechanically-alloyed TiNi powders were densified by Spark-Plasma Sintering(SPS) method. The densififcation behavior was investigated throgh the microstructural observation, the phase analysis and the measurement of change in devsity, linear shrinkage and densification rate as a function of temperature. Sintered body with close to 99% relative density was obtained at lower sintering temperature for shorter holding time in comparison to the conventional sintering methods. TiNi with B2 structure was confirmed as the major phase and Ti₂Ni as the second phase.
김혜성,이종필,박동규,안인섭,Kim, Hye Seong,Lee, Jong Pil,Park, Dong Kyu,Ahn, In Shup 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.6
In this study, analysis on the oxidation behavior was conducted by a series of high-temperature oxidation tests at both $800^{\circ}C$, $900^{\circ}C$ and 1000 in the air with sintered STS 316L. The weight gain of each oxidized specimen was measured, the oxidized surface morphologies and composition of oxidation layer were analyzed with Scanning Electron Microscope-Energy Dispersive x-ray Spectroscopy (SEM-EDS), finally, the phase change and composition of the oxidized specimen were shown by X-Ray Diffraction (XRD). As a result, the weight gain increased sharply at $1000^{\circ}C$ when oxidation test was conducted for 210 hours. Also, a plentiful of pores were observed in the surface oxidation layers at $900^{\circ}C$ for 210 hours. In addition, the following conclusions on oxidation behavior of sintered STS 316L can be obtained: $Cr_2O_3$ can be formed on pores by influxing oxygen through open-pores, $(Fe_{0.6}Cr_{0.4})_2O_3$ can be generated on the inner oxidation layer, and $Fe_2O_3$ was on the outer oxidation layer. Also, $NiFe_2O_4$ could be precipitated if the oxidation time was kept longer.
Synthesis of Titanium Carbide by Thermo-Chemical Methods with TiH2 and Carbon Black Powders
( In Shup Ahn ),( Tek Kyoung Sung ),( Sung Yeal Bae ),( Ho Jung Cho ),( Dong Kyu Park ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 METALS AND MATERIALS International Vol.12 No.3
A new synthesizing method for producing submicron TiC powders was studied by using TiH2 and carbon black powders. It is well known that hydrogen absorption transforms titanium from metal (h.c.p.) to brittle hydride (f.c.c.) powders by ball-milling. This research focused on obtaining submicron-sized TiC powders from the ball-milled mixture of TiH2 and carbon black by thermal treatment. The hydrogen, carbon, iron, and oxygen composition changes in the mixed powders were analyzed. Thereafter, a differential thermal analysis (DTA) test was performed to observe change of phase with ball-milling time. The TiC powders were obtained by heat treating the powders milled for 5 h at various temperatures (600-1200℃). The phase microstructure was investigated via DTA, X-ray diffraction (XRD), and scanning electron microscope (SEM). The mixture milled for 2 h had an f.c.t. structure containing 66.73 at.%H transformed to f.c.c. by milling for 4 h. After 5h of ball-milling, submicron-sized particles of 273 nm were obtained. At the isothermal heat-treating temperature of 500℃, the Ti single phase was formed completely, and the TiC phase of lattice parameter 0.310 nm was completely formed over the temperature of 1000℃.
Synthesis of Cathode Material-Nickel Sulfides by Mechanical Alloying for Sodium Batteries
Liu, Xiaojing,Ahn, Hyo-Jun,Ahn, In-Shup The Korean Powder Metallurgy Institute 2012 한국분말재료학회지 (KPMI) Vol.19 No.3
In this study, fine cathode materials $Ni_3S_2$ and $NiS_2$ were synthesized using the simple, convenient process of mechanical alloying (MA). In order to improve the cell properties, wet milling processes were conducted using low-energy ball milling to decrease the mean particle size of both materials. The cells of Na/$Ni_3S_2$ and Na/$NiS_2$ show a high initial discharge capacity of 425 mAh/g and 577 mAh/g respectively using wet milled powder particles, which is much larger than commercial ones, providing some potential as new cathode materials for rechargeable sodium-ion batteries.
Synthesis of Titanium Carbide Nano Particles by the Mechano Chemical Process
Ahn, In-Shup,Park, Dong-Kyu,Lee, Yong-Hee The Korean Powder Metallurgy Institute 2009 한국분말재료학회지 (KPMI) Vol.16 No.1
Titanium carbides are widely used for cutting tools and grinding wheels, because of their superior physical properties such as high melting temperature, high hardness, high wear resistance, good thermal conductivity and excellent thermal shock resistance. The common synthesizing method for the titanium carbide powders is carbo-thermal reduction from the mixtures of titanium oxide($TiO_2$) and carbon black. The purpose of the present research is to fabricate nano TiC powders using titanium salt and titanium hydride by the mechanochemical process(MCP). The initial elements used in this experiment are liquid $TiCl_4$(99.9%), $TiH_2$(99.9%) and active carbon(<$32{\mu}m$, 99.9%). Mg powders were added to the $TiCl_4$ solution in order to induce the reaction with Cl-. The weight ratios of the carbon and Mg powders were theoretically calculated. The TiC and $MgCl_2$ powders were milled in the planetary milling jar for 10 hours. The 40 nm TiC powders were fabricated by wet milling for 4 hours from the $TiCl_4$+C+Mg solution, and 300 nm TiC particles were obtained by using titanium hydride.
금속분말사출성형법으로 제조된 WC-10Co계 초경합금 소결체의 탄소첨가량에 따른 특성변화
강상대,박동욱,권영삼,조권구,안인섭,Kang, Sang-Dae,Park, Dong-Wook,Kwon, Young-Sam,Cho, Kwon-Koo,Ahn, In-Shup 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.3
In order to investigate the microstructure and mechanical properties of WC-10 wt% Co insert tool alloy fabricated by PIM (Powder Injection Molding) process, the feedstock of WC-10 wt% and wax used as a kind of binder were mixed together by two blade mixer. After injection molding, the debinding process was carried out by two-steps. First, solvent extraction, in which the binder was eliminated by putting the specimen into normal hexane for 24 hrs at $60^{\circ}C$, and subsequently thermal debinding which was conducted at $260^{\circ}C$ and $480^{\circ}C$ for 6 hrs in the mixed gas of $H_2/N_2$, respectively. Meantime, in order to compensate the decarburization due to hydrogen, 1.2~1.8% of carbon was added to ensure the integrity of the phase. Finally, the specimens were sintered in vacuum under different temperatures, and the relative density of 99.8% and hardness of 2100 Hv can be achieved when sintered at $1380^{\circ}C$, even the TRS is lower than the conventional sintering process.
Ahn, In-Shup,Bae, Sung-Yeal,Kim, You-Young 대한금속재료학회 2004 METALS AND MATERIALS International Vol.10 No.1
In the present study, equi-atomic porous TiNi shape-memory alloys have been successfully prepared by self- propagating high-temperature synthesis (SHS) using elemental titanium and nickel powders. The porous TiNi alloys thus obtained have an open porous structure with about 64 vol.% porosity, and the pore size is about 1.8 mm. The effect of preheating temperature on the microstructure has been investigated. It was found that the pore size increased with increasing preheating temperature. Moreover, the preheating temperature was shown to have a significant effect on the microstructure of the SHS-synthesized porous TiNi shape memory alloys. Aluminum was infiltrated into porous TiNi shape-memory alloys and the damping property of Al/TiNi was measured by a vibration analyzer (FFT analyzer). The specific damping capacity of Al/TiNi composites is 70 % that of a pure TiNi ingot.
ZnS 형광체 분말제조를 위한 기계적합금화법의 응용 연구
안인섭,정우현,배승열,성택경,박동규,Ahn In-Shup,Chong Woo-Hyun,Bae Sung-Yeal,Sung Tek-Kyoung,Park Dong-Kyu 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.4
In this study, the ZnS composite powders for host material in phosphor was synthesized in situ by mechanical alloying. As the mechanical alloying time increases, particle size of ZnS decreases. ZnS powders of $1.85\;\mu{m}$ in a mean size was fabricated by mechanical alloying for 10h. The crystal structures of ZnS powders were investigated by X-ray diffraction and the photo-luminescence properties was evaluated with the optical spectra analyzer. The steady state condition of mechanically alloyed ZnS was obtained as a mean particle size of $2\;\mu{m}$ in 5h milling. The sphalerite and wurtize structures coexist in the ZnS mechanically alloyed for 5h. The ZnS powder mechanically alloyed for 10h grows to the sphalerite structure. And the strong emission peaks of ZnS are observed at 480 nm wave length at the powders of mechanically alloyed for 10h, but the sphalerite and wurtize structures in ZnS coexist and emission peaks are not appeared at the powders of mechanically alloyed for 10h.