Sintering of Amorphous Al(OH)3 Using Cold Isostatic Pressing

It was found that the high decomposition temperature of amorphous Al(OH) 3 makes it possible to sinter corundum ceramics directly from aluminum hydroxide, bypassing the stage of its preliminary thermal dehydration. Using the cold isostatic pressing method at 200, 600, and 1000 MPa, compacts with den...

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Published inGlass and ceramics Vol. 80; no. 11-12; pp. 521 - 523
Main Authors Prilipko, S. Yu, Volkova, G. K., Loladze, L. V., Bryukhanova, I. I., Golovan, G. N., Glazunova, V. A.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.03.2024
Springer Nature B.V
Subjects
Aluminum hydroxide
Aluminum oxide
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cold isostatic pressing
Cold pressing
Compacts
Composites
Corundum
Decomposition
Dehydration
Glass
Materials Science
Natural Materials
Temperature dependence
ceramics
aluminum oxide
aluminum hydroxide
sintering
dilatometry
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Summary:It was found that the high decomposition temperature of amorphous Al(OH) 3 makes it possible to sinter corundum ceramics directly from aluminum hydroxide, bypassing the stage of its preliminary thermal dehydration. Using the cold isostatic pressing method at 200, 600, and 1000 MPa, compacts with densities of 62, 69, and 79% of the theoretical value were obtained. The temperature dependence of the shrinkage of amorphous Al(OH) 3 compacts was studied as a function of the cold isostatic pressing pressure. An area of intense shrinkage was discovered in the range 1050 – 1150°C, which coincides with both the temperature of complete decomposition of amorphous Al(OH) 3 and the transition γ → α-Al 2 O 3 .
ISSN:0361-7610
1573-8515
DOI:10.1007/s10717-024-00645-6