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열전달 촉진을 위한 탄소나노튜브(CNT)/금속 복합체 소결 코팅에 관한 연구
정희여 ( Xi Ru Zheng ),김민수 ( Min Soo Kim ),박찬우 ( Chan Woo Park ) 한국복합재료학회 2013 Composites research Vol.26 No.6
냉매의 비등이나 응축같은 열전달 향상을 위하여 금속 표면위에 탄소나노튜브(CNT)를 코팅하는 것을 연구하였다. 다중벽 탄소나노튜브/구리 복합소재는 어트리션 볼밀에 의해서 제작되었으며, 정전 도장 장치로 복합 분말을 구리 기판위에 코팅한 후 전기로에서 소결하였다. 본 논문에서는 CNT/Cu 코팅 표면의 분석 및 소결전후의 탄소나노튜브의 변화를 파악하기 위하여 샘플들을 주사전자현미경, EDAX, 라만분광법에 의해 분석하였다. 아울러 열전달 촉진은 비등열전달로 확인하였다. The coating of metal surface with carbon nanotubes (CNTs) has been studied for the heat transfer enhancement of the boiling and condensation of refrigerant. The MWCNT/copper composite powder was made by the attrition ball milling, which has been coated on the copper wafer by electrostatic powder coating and sintered with electric furnace. In this paper, experiments were performed to assess the characterization and comparison of CNT before and after sinterning and the morphology changes of the CNT/Cu-coated surface. The samples were examined by the scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDAX) and raman spectroscopy. To verify the heat transfer enhancement, boiling heat transfer tests were performed.
Graphene 입자 코팅 표면의 비등 열전달 특성에 대한 연구
정희여(Xi Ru Zheng),애드워드(E.J. Pialago),박찬우(Chan Woo Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
In the present study, the effect of graphene coating on boiling heat transfer is being investigated under a pool of saturated R134a. The influence of the coating thickness and the graphene content on the heat transfer was studied. Finally, the boiling performance of a graphene coated surface is compared with that of carbon nanotubes, acid-treated grapheme, diamond, copper coated surface.
MWCNT/Fe 복합소재를 이용한 비등 열전달 촉진 특성에 관한 연구
최원석(Won Seok Choi),정희여(Xi Ru Zheng),김대해(Dae Hae Kim),김다운(Da un Kim),박찬우(Chan Woo Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In the present study, the effect of carbon nanotube(CNT) coating on boiling heat transfer is being investigated under a pool of saturated R134a. The metal surface coating with CNT has been studied for the heat transfer enhancement of the boiling refrigerant. make the multiwalled CNT/Fe composite powder by attrition ball milling for 4h, The multiwalled CNT/Fe composite powder, has been coated on the Fe substrate by electrostatic powder coating and sintered with electric furnace at 850℃. Results showed that the use of MWCNT as a coating component can enhance boiling heat transfer.
첨가제 종류에 따른 탄소나노튜브 금속복합재료 소결코팅 영향
김대해 ( Dea Hea Kim ),정희여 ( Xi Ru Zheng ),김민수 ( Myin Su Kim ),박찬우 ( Chan Woo Park ) 한국복합재료학회 2012 Composites research Vol.25 No.5
냉매의 비등이나 응축같은 열전달 향상을 위하여 금속 표면위에 탄소나노튜브(CNT)를 코팅하는 것을 연구하였다. 분산제와 PVA(polyvinyl alcohol) 용액으로 분산 처리된 다중벽 탄소나노튜브/CuO의 복합 분말 코팅액을 구리기판위에 도포한 후 소결을 하였다. 본 논문에서는 CNT/CuO 소결 코팅시 다양한 분산제를 사용하여 소결 전후의 조직 형상 변화 및 특징을 실험적으로 평가하였다. 분산제로는 THF(Tetrahydrofuran), SDBS(Dodecylbenzenesulfonic acid sodium salt), SDS(Sodium dodecy sulfate)가 사용되었다. 각각의 시편들은 주사전자현미경, 열중량분석, 시차주사열량측정법, 라만분광법을 사용하여 분석하였다. The coating of metal surface with carbon nanotubes(CNTs) has been studied for the heat transfer enhancement of the boiling and condensation of refrigerant. The multiwalled carbon nanotube / copper oxide(CuO) composite powder, which has been surface modified by dispersant and polyvinyl alcohol solution, was ultrasonically sprayed and sintered on a copper wafer. In this paper, experiments were performed to assess the characterization and comparison of the carbon nanotube before and after sinterning and the morphology changes of the CNT/CuO-coated surface by using different dispersants. The dispersants used are THF (Tetrahydrofuran), SDBS(Dodecylbenzenesulfonic acid sodium salt), SDS(Sodium dodecy sulfate). The samples were examined by scanning electron microscopy(SEM), thermogravimetric analysis(TGA), differential scanningcalorimeter(DSC) and Raman spectroscopy.