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Magnesia-ammonium phosphate-bonded cordierite refractory castables: Phase evolution on heating and mechanical properties
A cordierite refractory castable was developed using the MgO-NH4)H2PO4 reaction. This castable was made with cordierite-mullite aggregates from scrap refractory material and a cement paste based on magnesia, calcined alumina, silica fume, and ammonium dihydrogen phosphate, which forms cordierite (2MgO dot 2Al 2O3 dot 5SiO2) during heating at high temperature. The mix with water was cast into steel molds; the cold setting occurs within 30 min. The set castables were thermally treated and the evolution of the phases was observed. Struvite (NH4) dot MgPO4 dot 6H2O) was identified at room temperature; between 110 and 750 degree C, the present phosphates were amorphous to X-ray diffraction (XRD). At 1100 degree C, magnesium orthophosphate (Mg3PO4)2) and aluminum orthophosphate (AlPO4) were present. At 1350 degree C, the main crystalline phases were cordierite and mullite. Cold and hot flexural strength, thermal shock resistance, and physical properties were measured. The properties of magnesia-phosphate-bonded cordierite castables were compared with cordierite material obtained by conventional slip-casting method from aggregates, clay, talc, and calcined alumina.
Magnesia-ammonium phosphate-bonded cordierite refractory castables: Phase evolution on heating and mechanical properties
A cordierite refractory castable was developed using the MgO-NH4)H2PO4 reaction. This castable was made with cordierite-mullite aggregates from scrap refractory material and a cement paste based on magnesia, calcined alumina, silica fume, and ammonium dihydrogen phosphate, which forms cordierite (2MgO dot 2Al 2O3 dot 5SiO2) during heating at high temperature. The mix with water was cast into steel molds; the cold setting occurs within 30 min. The set castables were thermally treated and the evolution of the phases was observed. Struvite (NH4) dot MgPO4 dot 6H2O) was identified at room temperature; between 110 and 750 degree C, the present phosphates were amorphous to X-ray diffraction (XRD). At 1100 degree C, magnesium orthophosphate (Mg3PO4)2) and aluminum orthophosphate (AlPO4) were present. At 1350 degree C, the main crystalline phases were cordierite and mullite. Cold and hot flexural strength, thermal shock resistance, and physical properties were measured. The properties of magnesia-phosphate-bonded cordierite castables were compared with cordierite material obtained by conventional slip-casting method from aggregates, clay, talc, and calcined alumina.
Magnesia-ammonium phosphate-bonded cordierite refractory castables: Phase evolution on heating and mechanical properties
Hipedinger, N.E. (author) / Scian, A.N. (author) / Aglietti, E.F. (author)
Cement and Concrete Research ; 34 ; 157-164
2004
8 Seiten, 32 Quellen
Article (Journal)
English
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