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- 저자 : 오필용(Phil Yong Oh) (검색결과 2 건)
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Rajesh Kumar Chinnaraj,장현식(Hyeon Sik Jang),오필용(Phil Yong Oh),홍성민(Seong Min Hong),최성만(Seong Man Choi) 한국연소학회 2020 한국연소학회지 Vol.25 No.1
Need to improve the performances of the gas turbines and rocket engines are hindered by the limitations caused by melting points of the metallic super alloys at the combustor outlet nozzle or turbine components. High thermal resistive non-metallic materials are considered as future solutions to this problem. Most of these alternative non-metallic materials are carbon based composite materials and these materials can enable the gas turbines or rocket engines to operate at temperatures higher than the metallic super alloys. In this paper, a hydrocarbon fuel based evaluation system for carbon based composite materials is introduced. This evaluation system allows the testing and validation of the material specimens in a fuel burnt high thermal flow. The local Mach numbers were measured at five different locations using wedge probes in the flow’s axial direction. The results reveal that the measured Mach numbers were almost constant about 1.4. The Mach number results indicate the flow generated by the evaluation system was stable and suitable for material evaluation.
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하프늄카바이드 코팅을 통한 2종형상의 탄소/탄소복합재의 내삭마성 향상연구
강보람 ( Bo-ram Kang ),김호석 ( Ho-seok Kim ),오필용 ( Phil-yong Oh ),최성만 ( Seong-man Choi ) 한국복합재료학회 2020 Composites research Vol.33 No.4
본 연구에서는 기상화학반응공정을 이용하여 실리콘카바이드가 코팅된 2종형상의 탄소/탄소복합재 위에 진공플라즈마용사를이용하여 하프늄카바이드를 코팅하였다. 코팅 전/후 시편을 5.06 MW/m2의 열유속에서 120초동안 산화 및 삭마 실험을 진행하였다. 시험 전/후의 질량 변화량을 통해 질량삭마율을 계산하였고 캘리퍼스와 고속카메라를 이용하여 길이변화를 측정하여 길이삭마량을 계산하였다. 시편 단면의 FE-SEM 및 EDS 분석을 통해 산화 및 삭마거동을 관찰하였다. 플라즈마 풍동 시험결과 코팅된 시편이 무게감소 및 길이변화가 적어 내산화 및 내삭마성이 높은 것으로 판단되었다. 그러나 동일조건에서 시험한 반구형과 원통형의 산화 및 삭마정도는 상이하였고 원통형에서 더 높은 내산화 및 내삭마성을 가지는 것으로 평가되었다. In this study, HfC was coated on two types of carbon/carbon composites coated with SiC by vacuum plasma spraying(VPS). The experiment was performed using a plasma wind tunnel with heat flux of 5.06 MW/m2 for 120 s heat flux before and after the coating. The mass ablation rate was calculated through the mass change before and after the test, and the length change was measured by using calipers and high speed camera. The oxidation/ ablation behavior were observed by FE-SEM with EDS analysis of the specimens cross section. The plasma wind tunnel test results showed that the coated specimens had low weight loss and length change, and high oxidation/ ablation resistance. However, two types of the specimens tested under the same conditions were different in the ablation behavior and ablation rate, and it was evaluated that the cylindrical type had higher oxidation/ablation resistance.
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