Densification and Properties of Fe₂O₃ Nanoparticles added CaO Refractories

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• 作者：Salman Ghasemi-Kahrizsangi ; ^{salman.gh1367@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Ali Nemati ; Aziz Shahraki ; Mohammad Farooghi
• 关键词：CaO refractory ; Nano-iron oxide ; Hydration resistance ; Cold crushing strength ; Flexural strength
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 August 2016
• 年：2016
• 卷：42
• 期：10
• 页码：12270-12275
• 全文大小：1263 K

文摘

Up to 8 wt. % of Nano-iron oxide was added to CaO refractory matrix. The crystalline phases and microstructure characteristics of specimens sintered at 1650 °C for 5 h in an electric furnace were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The physical properties are reported in terms of bulk density, apparent porosity and hydration resistance. The mechanical behavior was studied by a cold crushing strength (CCS) and flexural strength at 1200 °C test. As a result, it was found that the presence of Nano-iron oxide in the CaO refractory matrix induced 2CaO.Fe₂O₃ (C₂F), CaO.Fe₂O₃ (CF) and 3CaO.Al₂O₃ (C₃A) phase’s formation, which improved the sintering process. Nano-iron oxide also influenced the bonding structure through a direct bonding enhancement. On the Other hand, the presence of Nano-iron oxide resulting in improvement properties of CaO refractory matrix refractories such as bulk density, hydration resistance and cold crushing strength. The maximum flexural strength at 1200 °C is achieved by the samples containing 4 wt. % nano-Fe₂O₃.