용철과 제강 slag 간의 산소 및 인의 분배평형에 대한 정규용액 model 의 적용

심재동,정순효,만곡지랑 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.3

The approximate validity of the regular solution model for canons was examined to formulate the thermodynamic properties of steelmaking slags and to express quantitatively the equilibrium reaction between slag and metal. 1) The regular solution model was satisfied for multi-component stags such as Fe_tO-SiO₂-MgO, Fe_tO-SiO₂-CaO-MgO and Fe_tO-SiO₂-CaO-MgO-P₂O_5 systems, and the following values were obtained as interaction energies between cations. α_(15)(Fe^(2+)∼Mg^(2+))=3.070㎈, α_(25)(Fe^(3+)∼Mg^(2+))=-5,620㎈, α_(35)Si^(4+)∼Mg^(2+))=-30,500㎈, α_(45)(Ca^(2+)∼Mg^(2+))=4,500㎈, α_(36)(Si^(4+)∼P^(5+))=11,000㎈, α_(46)(Ca^(2+)∼P^(5+))=-125.000㎈, α_(56)(Mg^(2+)∼P^(5+))=-85,000㎈ 2) It was confirmed that applying the values of interaction energy to the regular solution model had enough certainty to estimate the oxygen content in liquid iron within the accuracy of ±10% over the wide range of slag compositions from basic to acidic stags. 3) Simple regular solution approximation was less favorable to apply for the phosphorus distribution between liquid iron and stags. It was proposed that a further modification of the model considering composition dependence of α_(ij) should be necessary to express the phosphorus equilibrium with a mathematical formula.

리튬계 수소저장재료의 연구개발 동향

심재동,심재혁,하헌필,Shim, Jae-Dong,Shim, Jae-Hyeok,Ha, Heon-Phil 한국재료학회 2012 한국재료학회지 Vol.22 No.3

Hydrogen is in the spotlight as an alternative next generation energy source for the replacement of fossil fuels because it has high specific energy density and emits almost no pollution, with zero $CO_2$ emission. In order to use hydrogen safely, reliable storage and transportation methods are required. Recently, solid hydrogen storage systems using metal hydrides have been under extensive development for application to fuel cell vehicles and fuel cells of MCFC and SOFC. For the practical use of hydrogen on a commercial basis, hydrogen storage materials should satisfy several requirements such as 1) hydrogen storage capacity of more than 6.5wt.% $H_2$, moderate hydrogen release temperature below $100^{\circ}C$, 3) cyclic reversibility of hydrogen absorption/desorption, 4) non toxicity and low price. Among the candidate materials, Li based metal hydrides are known to be promising materials with high practical potential in view of the above requirements. This paper reviews the characteristics and recent R&D trends of Li based complex hydrides, Li-alanates, Li-borohydrides, and Li-amides/imides.

Bi2Te3-Sb2Te3 고용체 화합물의 열전특성

심재동,성태연,김준명 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.4

To optimize the alloy design and material performances of the thermoelectric materials with the function of energy conversion of thermal↔electrical, the thermoelectric properties of the V_B Tellurides solid solution compounds have been studied in connection with the single crystal growing, crystallographics and the effects of the alloy compositions and temperatures on the semiconductive properties. The P-N couple performances have been also evaluated in view of application for the direct energy conversion devices.

Ar/Ar-H2 플라즈마에 의한 Nb 산화물의 탄소용융환원 및 Nb 금속의 정련

심재동,정순효,오영주 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.5

The carbothermic smelting reduction of Nb₂O_5 and successive refining of Nb crude metal were studied by Ar/Ar-H₂plasma arc. The Ar plasma reduction of Nb₂O_5 proceeded rapidly to form 2 N grade Nb metal in 15minutes and the Ar-H₂plasma was very effective to the simultaneous decarburization/deoxidation of Nb crude metal. The mixing ratio of carbon and plasma gas composition were main factors to attain the high purity Nb metal. The solubility product, [wt%C] [wt%0], was shown the minimum value of 0.0017 under the carbon ratio(C/Nb₂O_5) of 5.2 and Ar-20%H₂plasma gas. This results confirmed that the high Nb metal over 3 N grade can be refined from Nb₂O_5, by the one step process using the Ar and Ar-H₂plasma.

리기테다 소나무의 碎木 펄프화의 特性

沈載東,洪顯桂,辛東韶 서울대학교 농과대학 임산가공학과 1978 林産加工 Vol.2 No.1

마그네슘합금의 조직제어(組織制御)와 성형가공(成形加工) 및 스크랩 리싸이클링 기술(技術)

심재동,이동휘,Shim, Jae-Dong,Lee, Dong-Hui 한국자원리싸이클링학회 2011 資源 리싸이클링 Vol.20 No.1

마그네슘 합금은 비중이 1.74로 가벼운데다 비강도는 구조용 금속 중에서 가장 크며, 방진성, 전자파 차폐성, 저용점 용 여러 가지 장점이 있어 최근 자동차 부품과 전자산업 제품 분야에서 이용이 크게 기대되는 금속이다. 그러나 마그네슘의 결정구조는 조밀 육방정이기 때문에 소성변형이 가능한 슬립면이 한정되어 있으며 압연이나 압출가공 시에는 강한 집합조직이 형성되어 상온가공이 곤란하다. 따라서 지금까지 성형성 개선을 위한 조직제어와 성형기술 분야에서 많은 연구개발이 이루어져 왔다. 본고에서는 결정립과 집합조직에 관한 미세조직의 제어방법, 용체성형, 압연 및 압출에 관한 성형가공 기술과 마그네슘 스크랩 리싸이클링 기술에 관하여 최근의 연구개발 사례를 소개한다. Recently, magnesium alloys are in the spotlight as a promising materials in the fields of automobile parts and electronic appliances due to their merits representing light weight, high specific strength, damping property, shielding of electromagnetic wave and so on. However, magnesium alloys show a poor formability at room temperature because magnesium has HCP crystal structure with limited slip planes and strong basal texture is formed during plastic deformation process such as rolling and extrusion. Therefore, many R&D efforts have been paid for improvement of formability through grain refinement, texture control and various forming technologies. This paper is giving an overview about recent achievements on control of microstructures, forming technologies and magnesium scrap recycling.

고체산화철의 상방첨가에 의한 용선의 탈규거동 (脫硅擧動)

심재동,송규섭,현도빈 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.2

The behaviors of desiliconization of the hot pig iron by adding the solid iron oxide as a desiliconizing agent were studied. Even when small amount of iron oxide is added, the degree of desiliconization can be reached to 70% under the condition of slag with the basicity over 1.0. During desiliconizing treatment, the competiting reactions such as demanganization and decarburization are suppressed in the above slag condition. In (FeO) content less than 5%, the distribution ratio of silicon between slag and metal is approximately in agreement with the equilibrium value.

과학교사 전문성 기준 : 포스터 발표 ; 10학년 과학 산-염기관련 주제에 대한 교과서 분석 및 WBI 학습자료 개발

심재동 한국과학교육학회 2004 한국과학교육학회 학술발표 및 세미나집 Vol.- No.-

마그네슘합금의 표면처리에 관한 연구개발 동향

심재동,변지영,Shim, Jae-Dong,Byun, Ji-Young 한국재료학회 2013 한국재료학회지 Vol.23 No.1

Recently, consumption of magnesium alloys has increased especially in the 3C (computer, communication, camera) and automobile industries. The structural application of magnesium alloys has many advantages due to their low densities, high specific strength, excellent damping and anti-eletromagnetic properties, and easy recycling. However, practical application of these alloys has been limited to narrow uses of mild condition, because they are inferior in corrosion resistance and wear resistance due to their high chemical reactivity and low hardness. Various wet and dry processes are being used or are under development to enhance alloy surface properties. Various conversion coating and anodizing methods have been developed in a view of eco-friendly concept. The conventional technologies, such as diffusion coating, sol-gel coating, hydrothermal treatment, and organic coating, are expected to be newly applicable to magnesium alloys. Surface treatments for metallic luster or coloring are suggested using the control of the micro roughness. This report reviews the recent R&D trends and achievements in surface treatment technologies for magnesium alloys.

다공질 금속의 제조와 응용

심재동,변지영,Shim, Jae-Dong,Byun, Ji-Young 한국재료학회 2015 한국재료학회지 Vol.25 No.3

Porous metals are called as a new material of 21th century because they show not only extremely low density, but also novel physical, thermal, mechanical, electrical, and acoustic properties. Since the late in the 1990's, considerable progress has been made in the production technologies of many kinds of porous metals such as aluminum, titanium, nickel, copper, stainless steel, etc. The commercial applications of porous metals have been increased in the field of light weight structures, sound absorption, mechanical damping, bio-materials, thermal management for heat exchanger and heat sink. Especially, the porous metals are promising in automotive applications for light-weighting body sheets and various structural components due to the good relation between weight and stiffness. This paper reviews the recent progress of production techniques using molten metal bubbling, metal foaming, gas expansion, hollow sphere structure, unidirectional solidification, etc, which have been commercialized or under developing, and finally introduces several case studies on the potential applications of porous metals in the area of heat sink, automotive pannel, cathod for Ni-MH battery, golf putter and medical implant.