Upgrade recycling of cast iron scrap chips towards β-FeSi2 thermoelectric materials

• Main Authors: Nor Hairin, Assayidatul Laila, Nanko, Makoto, Takeda, Masatoshi
• Format: Article
• Language: English
• Published: MDPI AG 2014
• Subjects: TA401 Materials of engineering and construction; TH6014 Environmental engineering.
• Online Access: http://irep.iium.edu.my/67956/1/67956_Upgrade%20Recycling%20of%20Cast%20Iron.pdf; http://irep.iium.edu.my/67956/; https://www.mdpi.com/1996-1944/7/9/6304

The upgrade recycling of cast-iron scrap chips towards β-FeSi2 thermoelectric materials is proposed as an eco-friendly and cost-effective production process. By using scrap waste from the machining process of cast-iron components, the material cost to fabricate β-FeSi2 is reduced and the industrial waste is recycled. In this study, β-FeSi2 specimens obtained from cast iron scrap chips were prepared both in the undoped form and doped with Al and Co elements. The maximum figure of merit (ZT) indicated a thermoelectric performance of approximately 70% in p-type samples and nearly 90% in n-type samples compared to β-FeSi2 prepared from pure Fe and other published studies. The use of cast iron scrap chips to produce β-FeSi2 shows promise as an eco-friendly and cost-effective production process for thermoelectric materials.