Mullite whiskers derived from kaolin

Short mullite whiskers prepared by firing compacts of kaolin and NH 4Al(SO 4) 2·12H 2O powders, with a small addition (0.8, 1.5 wt%) of NaH 2PO 4·2H 2O, in air 1300 and 1400 °C for 15 h have been characterized in terms of whisker morphology, composition and structure. Relatively uniform whisker shap...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Ceramics international 2009-03, Vol.35 (2), p.579-583
Hauptverfasser: Kim, B.M., Cho, Y.K., Yoon, S.Y., Stevens, R., Park, H.C.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Short mullite whiskers prepared by firing compacts of kaolin and NH 4Al(SO 4) 2·12H 2O powders, with a small addition (0.8, 1.5 wt%) of NaH 2PO 4·2H 2O, in air 1300 and 1400 °C for 15 h have been characterized in terms of whisker morphology, composition and structure. Relatively uniform whisker shaped crystals grew within the silicate glass matrix. After chemically leaching the glass matrix with HF solution using a microwave heating source, the resulting whiskers were exposed as isolated crystals and exhibited an aspect ratio of >17 (∼0.5 μm in diameter). The mullite whiskers had a composition of 51.06 mol% Al 2O 3 and 48.94 mol% SiO 2, with an orthorhombic crystallographic structure.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2008.01.017