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알루미나를 첨가한 Hydroxyapatite의 기계적 물성에 미치는 Ca/P 몰비의 영향
이동윤,이승규,박훈,김창은,Lee, D.Y.,Lee, S.K.,Park, H.,Kim, C.E. 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.5
The effect of Ca/P mole ratio (Ca/P=1.60, 1.67, 1.75) in the initial solution on the mechanical properties of alumina added hydroxyapatite was investigated. Hydroxyapatite was synthesized by precipitation method using Ca(NO3)2$.$4H2O and (NH4)2HPO4 as starting materials and 5 wt% of ${\alpha}$-Al2O3 was added to precipitation solution. The powder was calcined at 800$^{\circ}C$ and sintered at 1,150∼1,400$^{\circ}C$ under water vapor atmosphere. With the increasing of Ca/P mole ration in the initial solution, the amount of tricalcium phosphate formed from the decomposition of hydroxyapatite reduced and the sinterability and mechanical properties were increased. The bending strength and Vickers hardness of the specimen sintered at 1,300$^{\circ}C$ with the Ca/P mole ratio of 1.75 in the initial solution were 230 MPa and 650 kg/$\textrm{mm}^2$, respectively. The improvement of mechanical properties was attributed to not only the effect of Ca/P mole ratio but also the strengthening of sintered body by Al substitution for P ions.
전해질 변화에 따른 Viologen 자기조립박막의 전하이동 특성 연구
이동윤,박상현,신훈규,박재철,장정수,권영수,Lee, D.Y.,Park, S.H.,Shin, H.K.,Park, J.C.,Chang, J.S.,Kwon, Y.S. 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.12
The self-assembled monolayers of alkane derivatives with sulfur containing head groups on gold substrates have been widely examined recently, since the binding between S atoms and Au surface is strong. The viologen has been widely investigated their well-behaved electrochemistry including electron transfer mediation, the surface-enhanced of the adsorption and the behavior of supramolecular assemblies at electrode surfaces in theses and various studies. Yiologen monolayers are formed onto QCM by self-assembly method. We studied the relationship of electron transfer from changing the anions in 0.1 M NaCl and NaClO$_4$ electrolyte solution. The EQCM measurements revealed the anions transfer during reduction and oxidation, respectively From the EQCM data, the well-defined shape peaks were nearly equal charges by cyclic voltammetry.
전해니켈도금된 대면적 롤금형 가공시 단결정 다이아몬드공구의 마모에 관한 연구
이동윤(D.Y. Lee),홍상현(S.H. Hong),강호철(H.C. Kang),최헌종(H.Z. Choi),이석우(S.W. Lee) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.7
Nickel-phosphorus alloys are attractive materials for diamond turning applications such as fabrication of large optics and other high precision parts. It is also well-known that the higher phosphorus content of the alloys minimizes the diamond tool wear. Due to the weakness of electoless nickel plating that the phosphorus contents is limited to 13-14% (wgt), increased attention has been paid at electro-nickel plating which enables the alloys with 15-16% phosphorus. In this study, experiments were carried out to observe the wear characteristic of single crystal diamond tools in micro-grooving of electro-nickel plated drums. The experiments shows that long distance (50km) machining of micro-grooving on electro-nickel plated drum is possible with a single crystal diamond tool without any significant tool wear and defective machined surface.