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이온빔 보조 증착법을 이용한 STS 316L 박막 합성에 관한 연구
이준희,송요승,이건환,이구현,이득용,윤종구,Lee, J.H.,Song, Y.S.,Lee, K.H.,Lee, K.H.,Lee, D.Y.,Yoon, J.K. 한국재료학회 2003 한국재료학회지 Vol.13 No.9
The thin films of 316L stainless steel were made on glass and S45C substrate by Ion beam assisted deposition with reactive atmosphere of argon and nitrogen. The films were deposited at the various conditions of ion beam power and the ratios of Ar/$N_2$gas. Properties of these films were analyzed by glancing x-ray diffraction method(GXRD), AES, potentiodynamic test, and salt spray test. The results of GXRD showed that austenite phase could be appeared by $N_2$ion beam treatment and the amount of austenite phase increased with the amount of nitrogen gas. The films without plasma ion source treatment had the weak diffraction peak of ferrite phase. But under the Ar plasma ion beam treatment, the strong diffraction peaks of ferrite phase were appeared and the grain size was increased from 12 to 16 nm. Potentiodynamic polarization test and salt spray test indicated that the corrosion properties of the STS 316L films with nitrogen ion source treatment were better than bulk STS 316L steel and STS 316L films with Ar ion source treatment.
전자빔 증착시 이온빔 보조증착 장비의 사용에 따른 $SiO_2 & TiO_2$ 박막의 광학적 특성
송명근,양우석,권순우,이형만,김우경,이한영,윤대호,송요승,Song, M.K.,Yang, W.S.,Kwon, S.W.,Lee, H.M.,Kim, W.K.,Lee, H.Y.,Yoon, D.H.,Song, Y.S. 한국결정성장학회 2007 한국결정성장학회지 Vol.17 No.4
다층간섭필터 제작을 위한 $SiO_2 & TiO_2$ 박막을 electron-beam을 이용하여 제작하였다. 이온빔 보조증착 장비를 이용한 경우, 아르곤 가스와 산소 가스의 비율에 따라 양극전류를 변화시키며 증착하였고, 전자빔만을 사용한 경우에는 $100{\sim}250^{\circ}C$까지 $50^{\circ}C$ 간격으로 온도를 조정하여 증착하였다 $SiO_2$ 박막의 경우 표면 거칠기는 $200^{\circ}C$와 양극전류 0.2A에서 가장 낮은 값을 보였으며, 굴절률은 이온빔 보조 장치를 사용한 박막이 전자빔만을 사용하여 증착한 박막보다 전체적으로 0.1 정도 낮았다. $TiO_2$의 경우 표면거칠기는 상온과 양극전류 0.2A에서 가장 낮으며, 굴절률은 이온빔 보조 증착장치를 사용한 박막이 전자빔만으로 증착한 경우보다 전체적으로 낮은 값을 나타내었다. The $SiO_2$ and $TiO_2$ thin films for the multilayer interference filter application were manufactured by electron beam process. In case of electron beam process with ion source, the anode current was controlled by gas volume ratio of $O_2$ and Ar. Substrate temperature of electron beam deposition without ion source was increased from 100 to $250^{\circ}C$ with $50^{\circ}C$ increment. The surface roughness values of $SiO_2$ thin films was most low value at $200^{\circ}C$ substrate temperature and 0.2 A anode current respectively. And the surface roughness values of $TiO_2$ thin films was most low value at room temperature and 0.2 A anode current repectively. The refractive index of $SiO_2$ and $TiO_2$ thin films to be deposited with ion source was usually lower than that of thin films without ion source.
권현옥(H.O. Kwon),강현욱(H.W. Kang),남영민(Y.M. Nam),송요승(Y.S. Song),홍상희(S.H. Hong),현규택(K.T. Hyun),윤종구(J.K. Yoon),이득용(D.Y. Lee),김선화(S. H. Kim) 한국표면공학회 2001 한국표면공학회지 Vol.34 No.1
The purpose of this study is to evaluate the properties of the functional gradient thermal barrier coatings by plasma spray process. The evaluations of mechanical and thermal properties such as fatigue, oxidation and wear-resistance at high temperatures have been conducted. Furthermore, residual stress and bond strength have been evaluated. The range of thickness of coated layers was 550~600㎛. The range of hardness of layers was 800~900 Hv and the porosity range of coatings was about 7 to 14%. The top coating layer of ZrO₂ in thermal barrier was composed of tetragonal structure after spraying. The coated layers of ZrO₂ on the Inconel substrate is the best resistance for thermal fatigue. Those coatings had the least compressive stress in comparison with other coatings. In high temperature oxidation test, the coatings on Inconel substrate was better than the coatings on SUS substrate. The bond strength of the concave type was greater than that of linear types and convex types coatings.
조화용융조성 $LiNbO_3$의 주기적 분극 반전 동안 도메인 생성 및 이동에 관한 연구
권순우,양우석,이형만,김우경,이한영,윤대호,송요승,Kwon, S.W.,Yang, W.S.,Lee, H.M.,Kim, W.K.,Lee, H.Y.,Yoon, D.H.,Song, Y.S. 한국결정성장학회 2006 한국결정성장학회지 Vol.16 No.2
조화용융조성 $LiNbO_3$ 결정에 외부 전계를 인가하였을 때 초기 도메인 생성 및 이동에 관하여 연구하였다. 0.5mm 두께의 $LiNbO_3$ 결정에 23.5, 22.0, 21.0kV/mm의 전계를 인가하였을 때 도메인 벽은 각각 28.70, 16.02, $5.75{\mu}m/sec$의 속도를 나타내었다. 분극 반전 시스템에 전류 제어를 위한 외부저항으로 $1 M{\Omega}$을 사용하였을 시 너무 빠른 도메인 성장으로 인하여 원활한 분극 반전 제어가 이루어지지 않으므로 $10 M{\Omega}$ 외부저항을 사용하여 전하량을 제어하여 50% duty cycle을 가진 주기적 분극 반전 $LiNbO_3$ 결정을 제작하였다. When external field was applied to congruent $LiNbO_3$, it was investgated for domain formation and expansion of $LiNbO_3$. The domain wall velocities of 0.5 mm thickness $LiNbO_3$ were 28.70, 16.02 and $5.75{\mu}m/sec$ under poling field of 23.5, 22.0 and 21.0 kV/mm, respectively. As $1 M{\Omega}$ resistor was used in domain inversion system, harmonic domain inversion was not achieved by rapid domain expansion. And 50% duty cycle periodically poled $LiNbO_3$ have been fabricated by charge control using $10 M{\Omega}$ resistor.
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.
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 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
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.