Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Refractory castables based on barium aluminate cements
There is increasing intersest nowadays in the use of barium aluminate containing cements as binders for refractory castables. Three aluminous cement compositions containing different proportions of barium aluminate were prepared from mixtures of calcined alumina, Egyptian barite, und limestone, by sintering briquettes at around 1600 deg C. The sintered bodies were ground to produce a cement powder of suitable fineness in which the predominant phases were found to be barium aluminate und calcium dialuminate. These cements were found to possess satisfactory cementitious behaviour and high refractoriness. Refractory castable compositions, based an the prepared cements und using sintered magnesia as aggregate, were formulated and evaluated for their physical, mechanical, and refractory properties. High strength und low shrinkage characterise the castable shapes in the cured, dried, und fired states. Such barium aluminate containing castables could be used effectively for lining structures subjected to very high temperatures. They are hard, dense, and volumes stable and have low porosity. They are also capable of withstanding very high temperatures without excessive shrinkage or cracking, and show excellent thermal shock resistance with good hot load strength. This enables their use in both repair work and in new furnace constructions.
Refractory castables based on barium aluminate cements
There is increasing intersest nowadays in the use of barium aluminate containing cements as binders for refractory castables. Three aluminous cement compositions containing different proportions of barium aluminate were prepared from mixtures of calcined alumina, Egyptian barite, und limestone, by sintering briquettes at around 1600 deg C. The sintered bodies were ground to produce a cement powder of suitable fineness in which the predominant phases were found to be barium aluminate und calcium dialuminate. These cements were found to possess satisfactory cementitious behaviour and high refractoriness. Refractory castable compositions, based an the prepared cements und using sintered magnesia as aggregate, were formulated and evaluated for their physical, mechanical, and refractory properties. High strength und low shrinkage characterise the castable shapes in the cured, dried, und fired states. Such barium aluminate containing castables could be used effectively for lining structures subjected to very high temperatures. They are hard, dense, and volumes stable and have low porosity. They are also capable of withstanding very high temperatures without excessive shrinkage or cracking, and show excellent thermal shock resistance with good hot load strength. This enables their use in both repair work and in new furnace constructions.
Refractory castables based on barium aluminate cements
Feuerfeste Gießmassen auf Bariumaluminat-Zementbasis
El-Hemaly, S.A.S. (Autor:in) / Khalil, N.M. (Autor:in) / Girgis, L.G. (Autor:in)
British Ceramic Transactions ; 102 ; 169-174
2003
6 Seiten, 11 Bilder, 5 Tabellen, 10 Quellen
Aufsatz (Zeitschrift)
Englisch
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