Development of ceramic based on steel slag with different magnesium content

• Published in: Advances in applied ceramics Vol. 112; no. 4; pp. 213 - 218
• Main Authors: Ai, X B, Li, Y, Gu, X M, Cang, D Q
• Format: Journal Article
• Language: English
• Published: London, England Taylor & Francis 01.05.2013; SAGE Publications
• Subjects: Ceramics; Crystalline phase; Crystals; Densification; Iron and steel industry; Liquid sintering; Magnesium; Magnesium ions; Microstructure; Scanning electron microscopy; Shrinkage; Sintering (powder metallurgy); Slags; Steel slag based ceramic; Structural steels; Crystalline phase; Magnesium ions; Steel slag based ceramic; Microstructure; Liquid sintering
• ISSN: 1743-6753; 1743-6761
• DOI: 10.1179/1743676113Y.0000000078

Abstract The steel slag based ceramics (SSBC) with different contents of magnesium ions were prepared by conventional sintering process. The variations of linear shrinkage, water absorption, bulk density and apparent porosity of the samples fired at different temperatures from 1130 to 1210°C were measured. The phase formation and microstructure of final ceramics were observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that increasing magnesium ions content in SSBC does not change the crystal phases but increases the sintering temperature. The final phases in SSBC are pyroxenes including augite and diopside. Crystalline phases in SSBC form before densification. Substitution of Fe 2+ for Mg 2+ in phases would increase amount of Fe 2+ in crystal, but decreases the amount in liquid, which is the main factor of the sintering temperature increase. Good degrees of densification and high crystallinity of ceramics show good mechanical properties.