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http://dx.doi.org/10.7844/kirr.2018.27.3.48

A Study on Addition of Rare Earth Element in the Spent Permanent Magnet Scrap to Gray Cast Iron  

Park, Seung-Yeon (Korea Institute of Rare Metals, Korea Institute of Industrial Technology)
Noh, Jung-Hyun (Korea Institute of Rare Metals, Korea Institute of Industrial Technology)
Kim, Hyo-jung (Korea Institute of Rare Metals, Korea Institute of Industrial Technology)
Lim, Kyoung-Mook (Korea Institute of Rare Metals, Korea Institute of Industrial Technology)
Publication Information
Resources Recycling / v.27, no.3, 2018 , pp. 48-57 More about this Journal
Abstract
In this study, we developed a method for manufacturing high strength gray cast irons by adding a rare earth element (R.E.) included in a spent permanent magnet scrap to gray cast irons. The improvement of the mechanical properties of gray cast irons is attributed to A-type graphite formation promoted by complex sulfide, which was formed by R.E. in the spent magnets during a solidification process. The cast specimen inoculated by R.E. in the spent magnet scrap showed excellent tensile strength up to 306 MPa, and is similar to that of the specimen inoculated by expensive misch-metal. In this regards, we concluded that the cheap spent magnets scrap is a very efficient inoculation agent in fabrication of high performance gray cast irons.
Keywords
Gray cast iron; Rare earth element; Permanent magnet scrap; Graphite reaction; Inoculation;
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