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압입 시험법을 이용한 플라즈마 용사 코팅층의 기계적 특성 평가
박진효(J. H. Park),김정석(J. S. Kim),김평호(P. H. Kim),이구현(K. H. Lee),송요승(Y. S. Song) 한국생산제조학회 2010 한국생산제조시스템학회 학술발표대회 논문집 Vol.2010 No.10
The metallic bond coating is important constituent of thermally sprayed thermal barrier coating(TBC) systems. It enhances the adhesion of ceramic thermal barrier layer to the substrate and also provides oxidation and corrosion protection to the substrate metal. However, most metallic bond coating layer peeling occurs easily due to the thermal fatigue and the low bonding strength between the substrate and coating layer. The purpose of this paper is to investigate the mechanical properties of the plasma spray coating layer depending on different coating method in TBC systems. The micro-hardness and Young's modulus are measured by nano-dindentation test for evaluation of mechanical characteristics. The critical fracture load(Pc) and interface toughness(Kc) of coating layers are computed from applied load and crack length.
CoNiCrAlY/YSZ 열차폐 코팅층의 레이저 표면처리에 따른 고온산화 거동 연구
박진효(J. H. Park),이구현(K. H. Lee),강명창(M. C. Kang),김정석(J. S. Kim) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
This paper is to investigate the effects of laser-treatment for thermal barrier coating(TBC) layers. The two-layer TBC are composed of CoNiCrAlY bond coating by vacuum plasma spray process and ZrO₂-8wt%Y₂O₃ ceramic coating layer by atmosphere plasma spray process. The Nd:YAG laser(wavelength 1.06㎛, 60W) was used for laser-treatment to coating surfaces. Different scanning speed and power were set to each sample and the surface structure was investigated by acoustic emission monitoring system. The microstructure and surface morphology were analyzed by SEM and XRD. The thermally grown oxide(TGO) behavior was evaluated by thermal oxidation test. In case of laser treated TBC, the re-melted coating layer appeared newly on the surface of coating layers and vertical crack was initiated from the surface. The thickness of TGO with laser treatment was smaller than that without laser treatment.
Inconel 738LC 합금의 열차폐 코팅 및 고온피로 특성
박진효(J. H. Park),김정석(J. S. Kim),이구현(K. H. Lee),송요승(Y. S. Song) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.10
This work investigated the thermal fatigue behavior of Inconel-738LC material deposited thermal barrier coating by vacuum plasma spray(VPS). The Inconel-738LC material which is widely used as a turbine parts is a CoNi-based superalloy with CoNiCrAlY bond coating and ZrO₂-8wt%Y2O3 ceramic top coating. The micro structure of coating layer was analyzed by SEM/EDS and XRD. Thermal fatigue tests were performed using compact tension specimens at 550,750,950℃, with the load frequency of 10㎐. The fatigue crack growth behavior was characterized depending on number of cycles. The crack growth rate was found to be greater at lower frequency and higher temperature.
CoNiCrAlY/YSZ 열차폐 코팅층의 레이저 표면처리에 따른 고온산화 거동 연구
박진효(J. H. Park),이구현(K. H. Lee),강명창(M. C. Kang),김정석(J. S. Kim) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
This paper is to investigate the effects of laser-treatment for thermal barrier coating(TBC) layers. The two-layer TBC are composed of CoNiCrAlY bond coating by vacuum plasma spray process and ZrO₂-8wt%Y₂O₃ ceramic coating layer by atmosphere plasma spray process. The Nd:YAG laser(wavelength 1.06㎛, 60W) was used for laser-treatment to coating surfaces. Different scanning speed and power were set to each sample and the surface structure was investigated by acoustic emission monitoring system. The microstructure and surface morphology were analyzed by SEM and XRD. The thermally grown oxide(TGO) behavior was evaluated by thermal oxidation test. In case of laser treated TBC, the re-melted coating layer appeared newly on the surface of coating layers and vertical crack was initiated from the surface. The thickness of TGO with laser treatment was smaller than that without laser treatment.
압입 시험법을 이용한 플라즈마 용사 코팅층의 기계적 특성 평가
박진효(J. H. Park),김정석(J. S. Kim),김평호(P. H. Kim),이구현(K. H. Lee),송요승(Y. S. Song) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
The metallic bond coating is important constituent of thermally sprayed thermal barrier coating(TBC) systems. It enhances the adhesion of ceramic thermal barrier layer to the substrate and also provides oxidation and corrosion protection to the substrate metal. However, most metallic bond coating layer peeling occurs easily due to the thermal fatigue and the low bonding strength between the substrate and coating layer. The purpose of this paper is to investigate the mechanical properties of the plasma spray coating layer depending on different coating method in TBC systems. The micro-hardness and Young's modulus are measured by nano-dindentation test for evaluation of mechanical characteristics. The critical fracture load(Pc) and interface toughness(Kc) of coating layers are computed from applied load and crack length.
플라즈마 용사법에 의한 CoNiCrAlY/YSZ 열차폐 코팅층의 레이저 표면처리에 관한 연구
박진효(J. H. Park),오재용(J. Y. Oh),신보성(B. S. Shin),이구현(K. H. Lee),김정석(J. S. Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper is to investigate the effects of laser-teratment for thermal barrier coating layers by plasma spray method. The two-layer thermal barrier coating is composed of l50㎛ CoNiCrAlY bond coating by vacuum plasma spray(VPS) process and 250㎛ ZrO₂-8wt%Y₂O₃ ceramic coating layer by air plasma spray(APS) process on Inconel-738. The Nd:YAG laser(wavelength l.06㎛) was used at a power of 60W to laser-treatment coatings surface. Different scanning speeds were set to apply different amounts of power to each sample. The coated microstructure and surface morphology were analyzed by SEM and XRD. The micro-crack was investigated the AE(acoustic emission) monitoring system. The AE energy, count and event are evaluated according to different laser power.
진공 플라즈마 용사공정에 의한 MCrAlY코팅재의 음향방출 신호 특성 연구
박진효(J. H. Park),이구현(K. H. Lee),예경환(K. H. Ye),김정석(J. S. Kim),강명창(M. C. Kang) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
This paper is to investigate a crack for plasma sprayed MCrAlY coated material by acoustic emission method in 4-point bending test. The CoNiCrAlY is coated on Inconel-718 by vacuum plasma spray process. Micro-hardness measurement was conducted by means of Micro Vickers-hardness indentor. The porosity of coating layer was measured using a SEM and Image Analyzer. AE monitoring system is composed of PICO type sensor, a wide band preamplifier(40㏈), a PC and AE DSP(16/32 PAC) board. The AE count, Hit and energy of coating specimens is measured according to coating thickness.