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특허(特許)와 논문(論文)으로 본 폐(廢)마그네슘 재활용(再活用) 기술(技術) 동향(動向)
문병기,유봉선,조영주,조봉규,Moon, Byoung-Gi,You, Bong-Sun,Cho, Young-Ju,Cho, Bong-Gyoo 한국자원리싸이클링학회 2013 資源 리싸이클링 Vol.22 No.3
Metal prices are rapidly rising due to increasing demand of metals and limited available resources according to the industrial requirement. As a result, securing a stable supply of these metal resources has been recognized as a core element of national competitiveness and sustained economic growth. In the case of magnesium and its alloys which are entirely depending on import, low-grade magnesium scraps from end-of-life vehicles and 3C(Camera, Computer, Communication) parts and magnesium wastes such as sludge and dross generated during melting process are hardly recycled. Accordingly, the development and commercialization of recycling technology of low-grade magnesium scrap is desperately needed to improve efficiency of resource circulation and to establish the required proprietary of resource metal supply and demand. In this study, papers and patents on recycling technologies of waste magnesium were analyzed. The range of search was limited in the open patents of USA (US), European Union (EP), Japan (JP), Korea (KR) and SCI journals from 1974 to 2012. Patents and journals were collected using key-words searching and filtered by filtering criteria. The trends of the patents and journals was analyzed by the years, countries, companies, and technologies. 산업적 요구에 따른 금속 소재의 사용량은 급증하고 있으나, 한정된 유용가능 자원으로 인해 원소재 가격이 급속도로 상승하고 있어, 이들 금속 자원의 안정적 확보가 국가 경쟁력 확보 및 지속적인 경제 성장의 핵심 요소로 인식되고 있다. 전량 수입에 의존하고 있는 마그네슘 소재의 경우, 수명을 다한 자동차 및 3C(Camera, Computer, Communication) 제품의 폐부품과 마그네슘의 용해 과정에서 발생하는 슬러지 및 드로스 등의 저품위 스크랩은 전량 폐기되고 있어 자원순환의 효율성을 제고하고 독자적인 원소재 수급 체계를 확립하기 위해서는 저품위 스크랩의 재활용 기술 개발 및 상용화가 절실하다. 본 연구에서는 폐마그네슘의 재활용 기술에 대한 특허와 논문을 분석하였다. 분석범위는 1974년~2012년까지의 미국, 유럽연합, 일본, 한국의 등록/공개된 특허와 SCI 논문으로 제한하였다. 특허와 논문은 키워드를 사용하여 수집하였고, 기술의 정의에 의해 필터링 하였다. 특허와 논문의 동향은 연도, 국가, 기업, 기술에 따라 분석하여 나타내보았다.
문병기 ( Byoung Gi Moon ),유봉선 ( Bong Sun You ),고기호 ( Ki Ho Koh ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.1
Magnesium alloys are emerging materials for green cars because they have the lowest density among structural metallic materials. With the increased use of magnesium the development of more effective magnesium recycling technology for all scrap types becomes more important. This paper extensively reviews the recycling technology of end-of-life magnesium scrap. Firstly, it describes the typical refining processes for sorted clean scrap such as flux and fluxless remelting. And it describes the several processes which are feasible to separate magnesium lloys from a light metal shredder fraction containing aluminum and other light matters or to remove surface contaminants and coated layers containing organic matters such as hydrocarbon compounds or harmful metallic elements such as nickel, copper, iron, and chromium. It also introduces the existing purification techniques for a seriously contaminated magnesium melt due to the incomplete removal of impurities.Finally, it discusses the cleanliness assessment techniques of magnesium alloy.
임창동 ( Chang Dong Yim ),김영민 ( Young Min Kim ),박성혁 ( Sung Hyuk Park ),유봉선 ( Bong Sun You ) 대한금속재료학회(구 대한금속학회) 2012 대한금속·재료학회지 Vol.50 No.9
One of the barriers limiting wide applications of magnesium alloys to various industries is their poor corrosion resistance. The corrosion properties of AZ91 magnesium alloy, which is the most popular magnesium casting alloy, are affected by microstructural and environmental factors. The corrosion properties of AZ91 magnesium alloy are affected by the corrosion properties of α-Mg and β phases, the volume fraction and distribution of β phase and area ratio of α-Mg/β phases. The corrosion properties of AZ91 magnesium alloy under various environments also change according to the passivity of films and types of corrosion products formed on its surface. The corrosion resistance of the magnesium alloys can be improved by microstructural control through the addition of alloying elements and optimization of the production process.