http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 권현옥(H.O. Kwon) (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
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.
-
-
ASP법에 의한 11층 경사기능성 열장벽 보호피막의 물성에 관한 연구
정모,홍상희,권현옥,강현욱,송요승 한국 항공대학교 항공산업기술연구소 1998 航空宇宙産業技術硏究所 硏究誌 Vol.8 No.-
이번 연구에서는 APS법으로 제조된 SUS모재 위의 YSZ/NiCrAIY 11층과 Inconel모재 위의 11층 열장벽 피막의 미세구조관찰과 고온피로시험, 고온산화시험, 고온내마모시험, 잔류응력측정, 접착강도평가, 열전도도(열낙차)시험등의 종합적인 기계적, 열적물성을 평가하였다. 피막의 두께는 500∼600㎛ 범위였고, 경도는 800∼900Hv 범위였으며, 기공도는 9.4%였고, 용사후 단열�의 지르코니아는 대부분 정방정으로 이루어져있었다. Inconel모재의 피막이 열피로에 가장 우수한 저항성을 보였고, 잔류응력도 다른 층에 비해 가장 적은 압축응력을 나타내었다. 고온산화시험에서는 Inconel모재가 SUS 모재에 비해 더 우수하였다. 고온내마모시험 결과, SUS모재의 11층 피막이 800℃시험에서 가장 우수한 내마모성능을 보유하였고, 300℃시험에서는 저온열화경향을 나타냈으며, 전체적으로는 응착마모 거동을 보였으며, 온도가 올라갈수록 마찰게수는 증가하였다. 접착강도는 2, 3, 5층에 비해 11층이 컸으며, 90(세라믹) : 10(NiCrAIY)층내에서 피막의 파단이 일어났다. 열전도도(열낙차)시험에서는 Inconel 11층의 T = 898℃였고, SUS 11층의 T = 818℃로 다른 층보다는 조금 낮아지는데, 이는 순수 세라믹층의 두께가 50∼60㎛ 범위로 다른 층에 비해 얇았기 때문이라 사료되고, 또 기공율이 9.4%로 다른 층에 비해 작아 열전도가 쉬었기 때문이라 사료된다. 이상의 결과를 종합한 결과 Inconel모재 11층 TBC가 가장 우수한 고온물성을 보유한 것으로 판단된다. The purpose of this study is to evaluate the functional gradient thermal barrier coatings. Recently, plasma spray coating process has been developed to deposit the thermal barrier coatings to improve the hot corrosion resistance, wear resistance and thermal shock resistance for high temperature devices and facilities in aircraft and aerospace, automotive, power generation and nuclear industries. The plasma spray technique is reported to be an optimum process to produce the graded metal-ceramic coatings which are effective in thermal barrier coating (TBC) for suppressing large differences of physical-mechanical properties of coating and substrate. Specimens be prepared the TBCs with 11 layers on Inconel substrate and SUS substrate by APS method. The evaluations of mechanical and thermal properties such as fatigue, oxidation and wear-resistance at high temperatures have been conducted. Furthermore, residual stress, bond strength, and thermal conductivity have been evaluated. The range of thickness of coated layers was 500∼600㎛. The range of hardness of layers was 800∼900 Hv and the average porosity of coatings was 9.4% The coating layer of ZrO₂in thermal barrier was composed of tetragonal structure after spraying. The coated layers of ZrO₂on 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. As shown in the results of the high temperature wear test, the 11 layer coating on the SUS had the best wear-resistance at 800℃. But, this coatings had the tendencies of low-temperature softening at 300℃. The main mechanism of wear was the adhesive wear and the friction coefficient of coatings was increased as increasing the test temperatures. The bond strength of the 11 layers was greater than that of 2, 3 and 5 layer coatings. The fracture of the coating layers was occurred in the 10th layer (90(Ceramic) : 10(NiCr AIY)). In thermal conductivity test, the T of the 11th layer coating on the Inconel was 898℃. The reason of this result is that the thermal conductivity of the 11 layer coatings on the SUS should be higher than that of others since the thicknesses of ceramic top layer of the 11 layer coatings on the SUS are 50∼60㎛ which was thinner than others and the average porosity of the 11 layer coatings on the SUS was 9.4% which was lower than others. According to the results of this research, TBC of 11 layer coatings on Inconel substrate was the optimum coating.
ScienceON
DBpia연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
