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게터용 Zr<sub>57</sub>V<sub>36</sub>Fe<sub>7</sub> 합금의 수소 흡수특성에 미치는 비정질화의 영향
박제신,서창열,김원백,Park Je-Shin,Suh Chang-Youl,Kim Won-Baek 한국재료학회 2005 한국재료학회지 Vol.15 No.12
The hydrogen sorption speeds of $Zr_{57}V_{36}Fe_7$ amorphous alloy and its crystallized alloys were evaluated at room temperature $Zr_{57}V_{36}Fe_7$ amorphous alloy was prepared by ball milling. The amorphous alloy was crystallized through two stages. Initially, $\alpha-Zr$ solid solution was appeared from the amorphous phase. Two cubic Laves compounds were precipitated afterwards from the remained amorphous and from excessively saturated solid solution at higher temperature. The hydrogen sorption speed of the partially crystallized alloy was higher than that of amorphous. The enhanced sorption speed of partially crystallized alloy was explained in terms of surface oxygen stability which has been known to retard the activation of amorphous alloys. The retardation could be reduce by crystallization process resulting in the observed increase in sorption property.
박제신,심건주,Park, Je-Sin,Sim, Geon-Ju 한국재료학회 2001 한국재료학회지 Vol.11 No.9
Molybdenum-based thermal spray powder is widely used for coating the moving parts of the internal combustion engines due to its excellent wear resistance. A composite powder of the $Mo_{40}(Al_{1-x}Si_x)_{60}$ system was synthesized using the SHS method. The synthesized bulk was pulverized and specially treated to produce thermal spray powder. It was found that the synthesis reaction consisted of two-steps: the formation of $Al_8/Mo_3$ and the formation of Mo(Al,Si)$_2$. Both the temperature and the rate of the SHS reaction linearly increased with the increase of the value of x in $Mo_{40}(Al_{1-x}Si_x)_{60}$, The temperature and the rate of the reaction were also affected by the compacting density of the specimens, exhibiting the maximum valves at 62% and 60%, respectively. Since spherical shape is advantageous to the thermal spraying process, shape-control of the powder was attempted with PVA as a binding additive, resulting in the successful production of almost perfectly spherical powder of 80 $\mu\textrm{m}$ Ø$(d_{50})$ mean particle size.
Capacitor용 Ta분말 제조공정 Waste Ta를 이용한 TaC분말 제조
박제신,서창열,윤재식,배인성,박형호,Park Je-Shin,Suh Chang-Youl,Yaon Jae-Sik,Bae In-Sung,Park Hyeoung-Ho 한국자원리싸이클링학회 2003 資源 리싸이클링 Vol.12 No.4
케퍼시터용 Ta 분말제조공정에서 발생하는 waste 분말을 이용하여 TaC 분말을 자전고온합성법에 의하여 합성하였다. waste TA는 합성반응의 활성 및 산화방지를 위하여 전처리공정에서 미분쇄 및 탈산처리가 필요하였다. 합성반응에서는 TaC 단일상은 6∼7wt.%C의 조성범위에서 얻을 수 있었다. 또한 반응온도는 시료의 압축력에 영향을 받으며, 압축력 1600psi에서 최고반응온도를 나타냈다. Using the wastes of Ta powder fabrication process for capacitor, TaC powder was synthesized by SHS method. In previous to synthesis, the waste Ta was needed of milling and deoxidization treatments for active reaction and prevention of oxidation. In SHS reaction, it was found that the TaC single phase was obtained in composition of 5~6wt.%C. The reaction temperature was affected by the compaction pressure of the specimens, exhibiting the maximum values at 1600psi, respectively.
박제신,임채헌,조영기,유연태 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.2
P-type Cu-TiN composites sensitive to CO gas, CuO-TiN and CuO-TiN-TiO2, were synthesized by ball millingCu33Ti67 and Cu15Ti85 alloys for 25 h in a pressurized N2 atmosphere. The sensing materials of CuO-TiN andCuO-TiN-TiO2 were prepared via a two-step oxidation process following an investigation of their CO gas-sensingproperties. Their sensing responses for CO gas were compared; typical for p-type semiconductors, the resistancesof both sensing materials increased as CO was introduced. The CuO-TiN-TiO2 powder had a greater responsethan the CuO-TiN powder at all temperatures tested. The highest responses shown by the two materials were to1000 ppm CO at 250 °C: a response of 5.4 by CuO-TiN-TiO2 and 3.1 by CuO-TiN. During the first oxidationstep of CuO-TiN-TiO2, micropores were formed that significantly increased this material’s specific surface area. Therefore, we believe that the superior response of the CuO-TiN-TiO2 sensing material was due to this surfacearea enlargement during the oxidation treatment.
박제신 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.12
Intermetallic compound TiAl was synthesized by using self-propagating high-temperature synthesis(SHS) method. SHS reaction of TiAl was realized by exothermic reaction between molten Al and solid Ti particles. The synthesis product consisted of TiAl(L1_(0) type) matrix which contains small amount of Ti₃Al as a second phase. The reaction temperature increased from 1477K to 1542K with increment of Al contents in mixed powder, but propagation rate decreased from 0.394 cm/sec to 0.238 cm/sec in the range of 52 at%Al to 54 at%Al. Also, both of reaction temperature and propagation rate in the range of 2.24 g/㎤ to 2.93 g/㎤ of green density increased linearly.
비정질 Zr-V-Ti 합금분말의 결정화에 따른 게터 특성 변화
박제신,김원백,백진선,Park, Je-Shin,Kim, Won-Baek,Baek, Jin-Sun 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.1
The hydrogen sorption speeds of $Zr_{57}V_{36}Ti_7$ amorphous alloy and its crystallized alloys were evaluated at room temperature. $Zr_{57}V_{36}Ti_7$ amorphous alloy was prepared by ball milling. The hydrogen sorption rate of the partially crystallized alloy was higher than that of amorphous. The enhanced sorption rate of partially crystallized alloy was explained in terms of grain refinement that has been known to promote the diffusion into metallic bulk of the gases. The grain refinement could be obtained by crystallization of amorphous phase resulting in the observed increase in sorption property.
Ti<sub>80-X</sub>Zr<sub>20</sub>V<sub>X</sub> 합금분말의 게터 특성
박제신,김원백,서창열,조성욱,Park, Je-Shin,Kim, Won-Baek,Soh, Chang-Youl,Cho, Sung-Wook 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.1
The activation temperatures and hydrogen sorption rates of $Ti_{80-X}Zr_{20}V_X$ alloys were evaluated at room temperature. The alloy powders were prepared by arc melting and then hydride-dehydride(HDH) process. The alloy powders were apt to activate by increase of vanadium in Ti-Zr-V alloys. The easy activation was explained in terms of surface oxygen content which decreased with increase of vanadium on Ti-Zr-V alloys.
전기선 폭발법으로 제조된 Al-Cu 합금 나노분말을 이용한 다공성 나노 입자 제조
박제신,김원백,서창열,안종관,김병규,Park, Je-Shin,Kim, Won-Baek,Suh, Chang-Youl,Ahn, Jong-Gwan,Kim, Byoung-Kyu 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.3
Al-Cu alloy nano powders have been produced by the electrical explosion of Cu-plated Al wire. The porous nano particles were prepared by leaching for Al-Cu alloy nano powders in 40wt% NaOH aqueous solution. The surface area of leached powder for 5 hours was 4 times larger than that of original alloy nano powder. It is demonstrated that porous nano particles could be obtained by selective leaching of alloy nano powder. It is expected that porous Cu nano powders can be applied for catalyst of SRM (steam reforming methanol).
박제신,이동진,김원백,길대섭 한국자원공학회 2004 한국자원공학회지 Vol.41 No.6
The Zr57V36B7 getter alloy was prepared by substitution of Fe in Zr57V36Fe7 getter alloy(St707) by B and its activation temperature was investigated. The Zr57V36B7 getter alloy powder consisted of two phases, i.e., hexagonal solid solution of -Zr and cubic Laves of Zr(V1-XBX)2. The activation temperature of this alloy was lowered about 200 compared to Zr57V36Fe7 getter alloy(St707). Lattice parameter of cubic Laves phase was increased from 7.3686 to 7.4403 by the substitution Fe by B. It is believed that the lowered activation temperature is due to increasement of instability in structure. Zr57V36Fe7 겟터합금(St707)의 Fe를 B로 치환한 Zr57V36B7합금을 제조하였으며, 이 합금의 활성화온도를 조사하였다. Zr57V36B7합금분말은 hexagonal형 -Zr 고용체와 cubic형 Zr(V1-XBX)2의 Laves 상의 2사으로 구성되어 있다. Zr57V36B7합금의 활성화 온도는 Zr57V36Fe7겟터합금(St707)보다 약 200 정도 저하하였다. Laves 상의 격자상수는 Fe를 B로 치환하였을 때 7.3686 에서 7.4403 로 증가하였다. 이러한 활성화온도의 저하는 구조내의 불안정성의 증가에 기인한 것으로 생각된다.
전기선 폭발법에 의하여 제조된 Al-Ni 합금 나노분말의 선택적 침출
박제신,김원백,서창열,장한권,안종관,김병규,Park, Je-Shin,Kim, Won-Baek,Suh, Chang-Youl,Chang, Han-Kwon,Ahn, Jong-Gwan,Kim, Byoung-Kyu 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.4
Al-Ni alloy nano powders have been produced by the electrical explosion of Ni-plated Al wire. The porous nano particles were prepared by leaching for Al-Ni alloy nano powders in 20wt% NaOH aqueous solution. The structural properties of leached porous nano powder were investigated by nitrogen physisorption, X-ray diffraction (XRD) and transmission Microscope (TEM). The surface areas of the leached powders were increased with amounts of AI in alloys. The pore size distributions of these powders were exhibited maxima at range of pore diameters 3.0 to 3.5 nm from the desorption isotherm. The maximum values of those were decreased with amounts of Al in alloys.