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- 저자 : 현규택(K.T. Hyun) (검색결과 2 건)
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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.
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BARE 법에 의한 (Ti, Al) N 초경피막의 조직 및 성질
한봉희,현규택,주정훈 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.10
Titanium Aluminum Nitride films were deposited on the high speed steel by Biased Activated Reactive Evaportation. Effect of the substrate temperature and nitrogen pressure on the formation, structure, and properties of the films was investigated. Phase identification, preferred orientation, lattice parameter, and effective crystallite size were studied with X-ray diffraction line broading, while the surface and interface of films were observed with a scanning electron microscope. Microhardness and impact adhesion were also measured. Only Ti₂AIN single phase existed below the nitrogen pressure of 4 × 10^(-4) Torr, while Ti₂AIN and Ti_(0.5)Al_(0.5)N coexisted above that pressure. Tendency of having(111) preferred orientation decreased with increasing nitrogen pressure. Effective crysallite size increased with increasing nitrogen pressure and substate temperature. The lower the nitrogen pressure, the finer the film surface morphology. Films have their maximum microhardness of 2500 KHN at the nitrogen pressure of 1×10^(-3) Torr. Impact adhesion property was enhanced with increasing nitrogen pressure.
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