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박동화(Park Dong-Wha) 한국조명·전기설비학회 1989 한국조명·전기설비학회 학술대회논문집 Vol.1989 No.-
In the thesis research on the C.T.I. in Phenolic resin as a parameter of atmospheric (IBC Publication 112) 1) In according as one"s decrease atmospheric, A number of drops with this as the start for a formative dry band and be produced scintillation increased in a voltage over 300[V]. 2) In a 900[mb] increased this best a number of drops for tracking. In according as one"s decrease atmospheric increased C.T.I. value.
최경수,박동화 ( Kyung Soo Choi,Dong Wha Park ) 한국공업화학회 1995 공업화학 Vol.6 No.5
플라즈마 용사(spraying) 공정을 이용하여 형성한 단열코팅층에 대한 연구를 수행하였다. 이 단열코팅은 공구강(KS 규격 : STD61) 기판위에 8wt%의 이트리아로 부분안정화된 지르코니아 분말을 사용하여 코팅하였으며, 본드코팅층은 니켈합금 분말을 사용하였다. 실험계획법으로서 플라즈마 용사 공정의 주된 영향을 미치는 인자를 선정하였고, 이에 대한 분석은 통계분석법 중 하나인 분산분석을 행하였다. 코팅층의 미세조직 및 기공도는 전자주사현미경과 영상분석기등을 사용하여 관찰하였고, 코팅의 품질은 단열효과, 열충격시험에 대한 저항성 등으로 평가하였다. 또한 기판과의 접착력 시험을 행하였다. 고도의 단열코팅층을 형성하기 위한 최적의 플라즈마 용사 공정변수는 실험계획법과 통계적 분석방법을 통하여 찾아낼 수 있었다. The formation of thermal barrier coating(TBC) layer using plasma spraying process was studied. Zirconia(partially stablized with 8wt% Yttria) coating was prepared for the TBC by plasma spraying on tool steel (KS : STD61) substrates. NiCrAlY powder was sprayed as a bond coating layer. Design of experiments was used to derive the main parameters of processing and determined the process parameters according to the analysis of variance. The microstructure and porosity of the coating were characterized using SEM, Image analysis etc. Coating qualities are discussed with respect to thermal barrier effects and thermal cycling test. And adhesive strength test was carried out. Optimum coating parameters which were derived from the statistical analysis could be found for high quality TBC.
박현,박동화 ( Hyun Park,Dong Wha Park ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.2
Diamond was synthesized on molybdenum substrate by chemical reaction of CH₄ and H₂ using the RF thermal plasma. The main factors of the diamond synthesis are the CH₄/H₂ ratio and the substrate temperature. Experiments were carried out by changing the CH₄/H₂ ratios from 0.2% to 4% arid by changing substrate temperature from 800℃ to 1100℃. The substrate temperature was measured by the optical pyrometer. Diamond which has good crystallinity and high density was synthesized, when substrate temperature was 1000℃, and CH₄/H₂ ratio was 0.5%. Ball-like type was observed by increasing CH₄/H₂ ratio and the substrate temperature. Diamond was synthesized by using the organic liquid precursor, ethanol instead of methane and good quality diamond was synthesized when the flow rate of ethanol is 0.1 ㎖/min.