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Effect of alumina cement and additives on the pot life of castable refractories
In recent years, ultra-fine powders have been widely used in various castables to improve their strength and corrosion resistance. Since the use of ultra-fine powders increases the likelihood of hazardous explosive spalling, there has been a trend toward increased addition of organic fibers. Increased addition of fine powders and organic fibers may reduce the workability or shorten the pot life of castables, which adversely affects installation. The present investigation of the effects of alumina cement (Al2O3 80 mass-% type) and additives on the pot life of castables revealed that the pot life could be prolonged without sacrificing the strength by combining proper dispersing agents. The results of the investigation are described in this paper. As castables become increasingly denser, technology for the use of dispersing agents and other additives would become important as a means to prolong the pot life. At present, new dispersing agents are being developed one after another and put into practice in various applications. Accordingly, we are planning to continue our investigation of such dispersing agents as would suppress air entrainment and prolong the pot life, with their compatibility with alumina cements taken into account. We are also planning to continue our investigation of the effective mechanism of dispersing agents since many aspects of it still remain unknown.
Effect of alumina cement and additives on the pot life of castable refractories
In recent years, ultra-fine powders have been widely used in various castables to improve their strength and corrosion resistance. Since the use of ultra-fine powders increases the likelihood of hazardous explosive spalling, there has been a trend toward increased addition of organic fibers. Increased addition of fine powders and organic fibers may reduce the workability or shorten the pot life of castables, which adversely affects installation. The present investigation of the effects of alumina cement (Al2O3 80 mass-% type) and additives on the pot life of castables revealed that the pot life could be prolonged without sacrificing the strength by combining proper dispersing agents. The results of the investigation are described in this paper. As castables become increasingly denser, technology for the use of dispersing agents and other additives would become important as a means to prolong the pot life. At present, new dispersing agents are being developed one after another and put into practice in various applications. Accordingly, we are planning to continue our investigation of such dispersing agents as would suppress air entrainment and prolong the pot life, with their compatibility with alumina cements taken into account. We are also planning to continue our investigation of the effective mechanism of dispersing agents since many aspects of it still remain unknown.
Effect of alumina cement and additives on the pot life of castable refractories
Einfluß des Aluminazements und der Additive auf die Topfzeit von Feuerfest-Gußmassen
Sato, M. (author) / Takata, M. (author) / Koga, Y. (author) / Iwamoto, S. (author)
Journal of the Technical Association of Refractories, Japan ; 20 ; 174-178
2000
5 Seiten, 3 Bilder, 9 Tabellen, 5 Quellen
Article (Journal)
English
feuerfester Zement , chemische Zusammensetzung , Aluminiumoxid , Calciumoxid , ultrafeines Pulver , Flockungsmittel , disperses System , Standzeit , chemische Stabilisierung , Dispergiermittel , Sulfonat , Polyglykol , Polycarbonsäure , Messverfahren , Fließverhalten , Aushärten , Druckfestigkeit , Schauminhibitor , Witterungsbedingung , feuerfeste Gießmasse
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