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• W2085229412 abstract "Reaction sintering of aluminium titanate was studied starting from different commercial alumina powders and rutile. The formation of titanate, the successive sintering process and the corresponding microstructure evolution have been investigated using differential dilatometry, X-ray powder diffraction and scanning electron microscopy. Reaction sintering of pure Al2TiO5 results in a coarse-grained material with low density; the dependence of the average grain size of the resulting material from the level of impurities of the starting alumina is qualitatively discussed; the purest aluminas result in the largest grains. Addition of 2 wt% of MgO changes the mechanism of titanate formation, resulting in a strong reduction of the average grain size and remarkable influence on densification of the final material. Since final microstructure is mainly determined by the amount of MgO added, the influence of the nature of alumina powder is less pronounced in comparison with pure Al2TiO5. Das reaktive Sintern von Aluminiumtitanat wurde, ausgehend von verschiedenen kommerziellen Aluminiumoxyd- und Rutilpulvern, untersucht. Die Bildung von Titanat, der fortschreitende Sinterprozeß und das sich ergebende Mikrogefüge wurde mit Hilfe von Differentialdilatometrie, Röntgenpulverbeugung und Rasterelektronenmikroskopie untersucht. Das reaktive Sintern von reinem Al2TiO5 ergibt ein grobkörniges Material mit geringer Dichte. Die Abhängigkeit der mittleren Korngröße des Endmaterials von den Verunreinigungen des Aluminiumoxyds wird qualitativ diskutiert; die reinsten Aluminiumoxyde ergeben die größten Körner. Die Zugabe von 2 Gew.% MgO verändert den Mechanismus der Titanatbildung und führt zu einer starken Abnahme der mittleren Korngröße und einer beträchtlichen Zunahme der Dichte des Endmaterials. Da das Mikrogefüge des Endmaterials hauptsächlich von der Menge des zugegebenen MgO bestimmt wird, ist der Einfluß des Aluminiumoxydpulvers weniger stark als bei reinem Al2TiO5. On a étudié le frittage réactionnel du titanate d'aluminium à partir de rutile et de différentes poudres d'alumine, de qualité commerciale. La formation du titanate et l'évolution de la microstructure lors du frittage qui lui est consécutif ont été suivies par dilatométrie différentielle, diffraction X de poudres et microscopie à balayage. Le frittage réactionnel d'Al2TiO5 pur produit un matériau à gros grains et de faible densité; on discute qualitativement l'influence des concentrations en impuretés de l'alumine de départ sur la taille de grains du produit final; les poudres les plus pures conduisent à la plus grande taille de grains. L'ajout de 2% pond. de MgO modifie le mécanisme de formation du titanate, réduisant fortement la taille moyenne des grains et améliorant notablement la densité du produit final. La microstructure est alors determinée essentiellement par la quantité de MgO ajoutée, et la nature de la poudre d'alumine utilisée est moins cruciale que pour Al2TiO5 pur." @default.
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• W2085229412 title "Reaction sintering of aluminium titanate: II—Effect of different alumina powders" @default.
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• W2085229412 doi "https://doi.org/10.1016/0955-2219(94)90019-1" @default.
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