A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Magnesia-phosphate bond for cold-setting cordierite-based refractories
A cold-setting refractory material was developed using the magnesia-phosphate reaction. A cement paste based on alumina, silica fume, magnesia and orthophosphoric acid or monoaluminum phosphate was designed to form cordierite-mullite during heating. This cement paste set at room temperature and MgHPO4 dot 3H2O phase (newberyite) was observed, but amorphous phases were predominant. Two exothermic effects were detected during the setting process corresponding to the acid-base reaction of magnesia with phosphates and to the formation of bonding hydrates. At 1100 degree C, C-AlPO4 was formed by reaction of alumina with orthophosphoric acid or monoaluminum phosphate. At 1350 degree C, the principal crystalline phases were cordierite and mullite. A refractory concrete with the obtained cement paste and a cordierite-mullite aggregate (scrap refractory material) was prepared. At 1350 degree C, this concrete had a thermal expansion coefficient of 1.0 x 10-6 degree C-1 and a flexural strength of 10 MPa.
Magnesia-phosphate bond for cold-setting cordierite-based refractories
A cold-setting refractory material was developed using the magnesia-phosphate reaction. A cement paste based on alumina, silica fume, magnesia and orthophosphoric acid or monoaluminum phosphate was designed to form cordierite-mullite during heating. This cement paste set at room temperature and MgHPO4 dot 3H2O phase (newberyite) was observed, but amorphous phases were predominant. Two exothermic effects were detected during the setting process corresponding to the acid-base reaction of magnesia with phosphates and to the formation of bonding hydrates. At 1100 degree C, C-AlPO4 was formed by reaction of alumina with orthophosphoric acid or monoaluminum phosphate. At 1350 degree C, the principal crystalline phases were cordierite and mullite. A refractory concrete with the obtained cement paste and a cordierite-mullite aggregate (scrap refractory material) was prepared. At 1350 degree C, this concrete had a thermal expansion coefficient of 1.0 x 10-6 degree C-1 and a flexural strength of 10 MPa.
Magnesia-phosphate bond for cold-setting cordierite-based refractories
Hipedinger, N.E. (author) / Scian, A.N. (author) / Aglietti, E.F. (author)
Cement and Concrete Research ; 32 ; 675-682
2002
8 Seiten, 28 Quellen
Article (Journal)
English
Magnesia-phosphate bond for cold-setting cordierite-based refractories
| British Library Online Contents | 2002
Magnesia-phosphate bond for cold-setting cordierite-based refractories
| Online Contents | 2002