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유체내 전기선폭발에 의한 그래핀-은 나노유체 제조 및 특성
전종훈(Jong-Hoon Jeon),김지혜(Ji-Hye Kim),최부영(Bu-Young Choi),노정필(Jung-Pil Noh),허선철(Sun-Chul Huh) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
A graphene-silver nanofluid was prepared by using an electric wire explosion method to coat the graphene particles with silver nanoparticles. The number of times of explosion was set as a variable and the concentration of silver nanoparticles was made different. The properties of graphene - silver nanofluid were confirmed by using thermal conductivity and TEM and SEM. As a result, it was confirmed that graphene grains were attached to silver nanoparticles, and the change in thermal conductivity was confirmed based on distilled water.
김도현(Do Hyeon Kim),양진호(Jin Ho Yang),김현지(Hyun Ji Kim),노정필(Jung Pil Noh),허선철(Sun Chul Huh) 대한기계학회 2022 大韓機械學會論文集A Vol.46 No.6
본 논문은 AL7075-T7351 합금재료에 DC 마그네트론 스퍼터링(direct current magnetron sputtering) 법으로 티타늄 코팅을 증착시켜 마모 특성을 향상하고 코팅재로서 항공기 응용 분야에 적용하고자 한다. 티타늄 박막 증착 후 마찰 마모실험, 경도측정, 접착강도 실험을 수행한 결과 증착시간 90분, 2mTorr에서 마찰계수 및 접착강도 특성이 우수하였다. 티타늄 박막 증착 시 공정조건에 따라 내마모성은 크게 달라진다. 증착압력이 낮아질수록 평균 마찰계수가 낮고 마모량은 적었으며 경도와 접착강도는 향상됐다. This study aims to deposit titanium coating on an AL7075-T7351 alloy material using a DC magnetron sputtering method to improve wear resistance and apply it to the aircraft application field as a coating material. After titanium thin film deposition, tests of friction coefficient, wear loss, hardness, and adhesion strength of the film were performed. Consequently, the friction coefficient and abrasion loss adhesive strength characteristics were excellent under the deposition time of 90 min and pressure of 2 mTorr. When depositing a titanium thin film, wear resistance significantly varied depending on process conditions. Coating with titanium increased hardness compared to that of substrate materials and improved adhesion strength compared to that of base materials.
배경태(Gyeong-Tae Bae),김귀남(Gwi-Nam Kim),최부영(Boo-Young Choi),문홍만(Hong-Man Moon),노정필(Jung-Pil Noh),허선철(Sun-Chul Huh) 한국해양공학회 2015 韓國海洋工學會誌 Vol.29 No.1
To improve the accuracy of a machine, research needs to be conducted on the relationship between the output variables and design variables of a spindle-shaped part from the thermal and static viewpoints. Therefore, research was carried out by examining the correlation of each variable to find the optimum conditions. Moreover, DOE (design of experiments) was extensively used. The model used in this study was a grinding spindle to which a hydrostatic bearing was applied. This model was used in a preliminary analysis based on the experimental results of the previous studies. The influences of the output variables and design variables were compared through a main effect analysis. Generated response surfaces were applied to the Kriging model. To optimize the model, a screening method was selected. In comparison with the initial model, the deformation of the optimized model designed by DOE decreased by 4.1 ㎛, while the thermal deformation decreased by 1.2 ㎛. Therefore, it was efficient to design a spindle-shaped part through DOE to improve the accuracy of the machine.