Characterization of sol-gel mullite powders

Journal Article · Tue Feb 28 23:00:00 EST 1995 · Materials Research Bulletin

DOI:https://doi.org/10.1016/0025-5408(94)00139-1· OSTI ID:27975

Chen, Y F; Vilminot, S ^[1]

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1. IPCMS, Strasbourg (France). Groupe des Materiaux Inorganiques

Using tetraethyl orthosilicate and aluminum tri-sec-butoxide as raw materials, two series of mullite gels were prepared, one involving a chemical modification of aluminum alkoxide by ethylacetoacetate, the other one by reacting both alkoxides in a non-homologous alcohol, i.e., isopropyl alcohol or 2-methoxyethanol. For the first route, the excess water or basic conditions promote the formation of nanosized powders that appear X-ray amorphous after the crystallization exotherm on the DTA trace. The same result is obtained for the second route with isopropanol as solvent. The sample preparation strongly influences the ceramic densifications that can vary from 70 to 93 % of the theoretical value after 1,200 C calcination.

• OSTI ID: 27975
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 3 Vol. 30; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BULK DENSITY
DIFFERENTIAL THERMAL ANALYSIS
MULLITE
PRECURSOR
REACTION KINETICS
SOL-GEL PROCESS
X-RAY DIFFRACTION