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High-strength and corrosion-resistant alumina tubes through extrusion, Part 2
During continuous operation under extreme temperatures and high pH value, e.g. in molten glass, thermal protection tubes are characterised by strong wear, the reduction of which was the aim of the presented development. The optimisation of numerous parameters also included the binding agent, which ultimately turned out to be the decisive key for bringing the bulk density, the Al2O3-content, and the strength to a very high level for extruded alumina components in comparison. However, simultaneously it was possible to significantly reduce the deflection under high-temperature influence and chemical attack becoming apparent through glass level cut corrosion and loss of wall thickness. It was not possible to extrude any tubes complying with the requirements specification using different traditional cellulose ether binding agents. This could only be achieved by means of a new development, within the framework of which the exact requirements specification in the extrusion process and the final application was taken into account. Exemplary action profiles of cellulose ethers in the extrusion process are demonstrated. For the first time the extrusion process enabled the production of parts showing properties (e.g. density, strength, porosity) which could be realised so far only by isostatic pressing. In Part 1 of the paper (ceramic forum international cfi/Ber. DKG 89 (2012) [5] E115-121) the development approach in general, the special requirements for the binding agent and tests of different formulated pastes on the capillary rheometer have been described. In Part 2 investigations using sintered samples, the implementation of the pilot and operating tests as well as product and application tests are presented.
High-strength and corrosion-resistant alumina tubes through extrusion, Part 2
During continuous operation under extreme temperatures and high pH value, e.g. in molten glass, thermal protection tubes are characterised by strong wear, the reduction of which was the aim of the presented development. The optimisation of numerous parameters also included the binding agent, which ultimately turned out to be the decisive key for bringing the bulk density, the Al2O3-content, and the strength to a very high level for extruded alumina components in comparison. However, simultaneously it was possible to significantly reduce the deflection under high-temperature influence and chemical attack becoming apparent through glass level cut corrosion and loss of wall thickness. It was not possible to extrude any tubes complying with the requirements specification using different traditional cellulose ether binding agents. This could only be achieved by means of a new development, within the framework of which the exact requirements specification in the extrusion process and the final application was taken into account. Exemplary action profiles of cellulose ethers in the extrusion process are demonstrated. For the first time the extrusion process enabled the production of parts showing properties (e.g. density, strength, porosity) which could be realised so far only by isostatic pressing. In Part 1 of the paper (ceramic forum international cfi/Ber. DKG 89 (2012) [5] E115-121) the development approach in general, the special requirements for the binding agent and tests of different formulated pastes on the capillary rheometer have been described. In Part 2 investigations using sintered samples, the implementation of the pilot and operating tests as well as product and application tests are presented.
High-strength and corrosion-resistant alumina tubes through extrusion, Part 2
Bayer, Roland (author) / Lang, Mirco (author)
2012
4 Seiten, 7 Bilder, 1 Tabelle, 3 Quellen
Article (Journal)
English
Korrosion , Parameteroptimierung , Dauerbetrieb , chemischer Angriff , isostatisches Pressen , Tonerde , Celluloseether , geschmolzenes Glas , Schutzschlauch , Hochfestigkeit , Bindemittel , Hochtemperatur , Wanddicke , pH-Wert , Schüttdichte , Betriebsanalyse , Produkttest , Aluminiumoxid , Aluminiumoxidbinder , keramisches Strangpressen , Korrosionsfestigkeit , Hochtemperaturkorrosion
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