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Abstract

The aim of the present work is to prepare, characterise and assess MgO–Al₂O₃–SiO₂ refractory ceramics; namely, spinel, mullite and cordierite from chemically recycled precipitates. These precipitates include pure and fine magnesium and aluminium hydroxides as well as water treated fumed silica. Corresponding batches of the aimed oxide ceramics were coprecipitated from these precipitates and subsequently processed up to firing using the proper techniques. The processed bodies were investigated for their chemical and phase composition as well as morphology, microstructure and physical properties. According to the results of these investigations, the processed ceramics could be recommended for the adequate applications. It is concluded that dense, direct bonded and highly refractory spinel and mullite–corundum bodies could be obtained after firing their coprecipitated batches up to 1700°C. On the other side, dense, porous and refractory cordierite–spinel bodies could be processed from its batch after firing up to 1350°C. All of these bodies are refractory oxide ceramics with a very wide range of thermo-chemical, physical and mechanical applications.

Keywords

SHAPED MGO-AL2O3-SIO2 REFRACTORY CERAMICS RECYCLED MATERIALS

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Shaped MgO–Al 2 O 3 –SiO 2 refractory ceramics from recycled materials

Abstract

Keywords

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