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장중철(Jung-Chel Chang),장성용(Sung-Young Chang),김범수(Beom-Soo Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The Blade is typical hot gas part of gas turbine. especially 1st blade is operated severe environments which include both above 1300℃ high temperature gas and thermal stress by high speed rotation of 3600 rpm. To obtain high efficiency, thermal barrier coating(TBC) and internal cooling system have been used. In this study, we examined thermal barrier coating and base materials of 1st and 2nd blades to evaluate degree of degradation, and then investigate the type and cause of failure by degradation.
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화학양론 조성의 뮬라이트 합성거동과 입자형상에 미치는 전구체 pH의 영향
이재언,김재원,정연길,장중철,조창용,Lee, Jae-Ean,Kim, Jae-Won,Jung, Yeon-Gil,Chang, Jung-Chel,Jo, Chang-yong 한국재료학회 2002 한국재료학회지 Vol.12 No.7
Stoichiometric mullite ($3Al_2$$O_3$. $2SiO_2$) precursor sol has been prepared by sol-gel method. The effects of the precursor pH and sintering temperature on the synthesizing behavior and morphology of mullite have been studied. Mullite precursor sol was prepared by dissolution of aluminum nitrate enneahydrate (Al($NO_3$)$_3$.9H$_2O) into the mixture of silica sol. Precursor pH of the sols was controlled to acidic condition ($PH\leq$ 1~1.5) and to basic condition ($pH\geq$8.5~9). The synthesized aluminosilicate sols were formed under 20 MPa pressure after drying at $150^{\circ}C$ for 24 hours, and then sintered for 3hours in the temperature range of $1100~1600^{\circ}C$. From TGA/DTA analysis, total weight loss in the aluminosilicate gel of the acidic sample was (equation omitted) 56% and that of the basic sample was (equation omitted) 85%, indicating that the synthesizing temperature of mullite phase for acidic and basic samples was above $1200^{\circ}C$ and $1300^{\circ}C$, respectively. The morphologies of the synthesized mullite were fine and needle-like (or rod-like) for acidic sample, and granular for basic sample that has been sintered above $1300^{\circ}C$. It was found that the morphology of mullite particle was predominantly governed by precursor pH and sintering temperature.
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1300℃급 가스터빈 1단 블레이드의 코팅분석을 이용한 열화평가
송태훈 ( Tae Hoon Song ),장성용 ( Sung Yong Chang ),김범수 ( Beom Soo Kim ),장중철 ( Jung Chel Chang ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.10
The first stage blade of a gas turbine was operated under a severe environment which included both 1300℃ hot gas and thermal stress. To obtain high efficiency, a thermal barrier coating (TBC) and an internal cooling system were used to increase the firing temperature. The TBC consists of multi-layer coatings of a ceramic outer layer (top coating) and a metallic inner layer (bond coat) between the ceramic and the substrate. The top and bond coating layer respectively act as a thermal barrier against hot gas and a buffer against the thermal stress caused by the difference in the thermal expansion coefficient between the ceramic and the substrate. Particularly, the bondcoating layer improves the resistance against oxidation and corrosion. An inter-diffusion layer is generated between the bond coat and the substrate due to the exposure at a high temperature and the diffusion phenomenon. A thickness measurement result showed that the bond coat of the suction side was thicker than that of the pressure side. The thickest inter-diffusion zone was noted at SS1 (Suction Side point 1). A chemical composition analysis of the bond coat showed aluminum depletion around the inter-diffusion layer. In this study, we evaluated the properties of the bond coat and the degradation of the coating layer used on a 1300℃-class gas turbine blade. Moreover, the operation temperature of the blade was estimated using the Arrhenius equation and this was compared with the result of a thermal analysis.
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