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CaCl<sub>2</sub>-CaF<sub>2</sub>-CaO 용융염에서 YSZ 세라믹의 고온 안정성에 미치는 성형공정의 영향
김완배,권숙철,조수행,이종현,Kim, Wan-Bae,Kwon, Suk-Cheol,Cho, Soo-Haeng,Lee, Jong-Hyeon 한국재료학회 2020 한국재료학회지 Vol.30 No.4
The high-temperature stability of YSZ specimens fabricated by die pressure and cold isostatic press (CIP) is investigated in CaCl<sub>2</sub>-CaF<sub>2</sub>-CaO molten salt at 1,150 ℃. The experimental results are as follows: green density 46.7 % and 50.9 %; sintering density 93.3 % and 99.3 % for die press and CIP, respectively. YSZ foremd by CIP exhibits higher stability than YSZ formed by die press due to denseness dependency after high-temperature stability test. YSZ shows peaks mainly attributed to CaZrO<sub>3</sub>, with a small t-ZrO<sub>2</sub> peak, unlike the high-intensity tetragonal-ZrO<sub>2</sub> (t-ZrO<sub>2</sub>) peak observed for the asreceived specimen. The t-ZrO<sub>2</sub> phase of YSZ is likely stabilized by Y<sub>2</sub>O<sub>3</sub>, and the leaching of Y<sub>2</sub>O<sub>3</sub> results in phase transformation from t-ZrO<sub>2</sub> to m-ZrO<sub>2</sub>. CaZrO<sub>3</sub> likely forms from the reaction between CaO and m-ZrO<sub>2</sub>. As the exposure time increases, more CaZrO<sub>3</sub> is observed in the internal region of YSZ, which could be attributed to the inward diffusion of molten salt and outward diffusion of the stabilizer (Y<sub>2</sub>O<sub>3</sub>) through the pores. This results in greater susceptibility to phase transformation and CaZrO<sub>3</sub> formation. To use SOM anodes for the electroreduction of various metals, YSZ stability must be improved by adjusting the high-density in the forming process.
해외협력사업 활성화를 위한 정책 제언-한,몽골 사례를 중심으로
김완배 ( Wan Bae Kim ),김관수 ( Kwan Soo Kim ) 한국국제농업개발학회 2010 韓國國際農業開發學會誌 Vol.22 No.3
International cooperation programs between Korea, where a need for securing food supply is high, and developing countries such as Mongolia, Far East Russia, and Cambodia, where import amounts of grain and food are significant because of constraints in capital and technology despite their land resources, could provide win-win strategies for both parties. This paper highlights the significance of these programs and derives a package of policies targeting to upgrade the benefits of these programs. In particular, our research focus is on Korea-Mongolia cooperation programs in the area of agriculture and food. Understanding the pros and cons of these programs from a viewpoint of both parties, a set of "win-win" strategies for future oversea`s cooperation programs were derived. They include (1) development of strategies encompassing oversea`s cooperation programs, (2) setting an appropriate role of public and private sectors, (3) improving familiarities on local information, special knowledge on projects, (4) revising laws and rules to facilitate international agricultural cooperation programs, (5) creating tax incentives for a project, (6) cooperation between agencies working on oversea`s cooperation programs, and (7) creating a linkage between ODA projects and international agricultural cooperation programs.