Direct Process Metal Alkoxides as Ceramic Precursors

Autor:	J. H. Burk, R. J. Ayen
Rok vydání:	1986
Předmět:	Materials science Silicon Magnesium chemistry.chemical_element Mullite Cordierite Yttrium engineering.material chemistry.chemical_compound chemistry Chemical engineering visual_art Alkoxide visual_art.visual_art_medium engineering Cubic zirconia Ceramic
Zdroj:	MRS Proceedings. 73
ISSN:	1946-4274 0272-9172
DOI:	10.1557/proc-73-801
Popis:	Metal alkoxides have great promise as oxide ceramic precursors. Direct manufacture from the metal and the alcohol permits the production of high purity materials and of those alkoxides which cannot be easily obtained by other routes. Examples which are of great interest to ceramics are the alkoxides of silicon, aluminum, magnesium and yttrium.Currently, only tetraethyl silicate is produced in large volumes by the direct route, employing a catalytic continuously fed process, yielding a distilled product. The reactivity of silicon, aluminum, magnesium and yttrium is governed by the metal surface state and activation and varies with different catalysts and alcohol chain length and branching.The major use of tetraethyl silicate is in partially hydrolyzed form as binder for precision casting molds and zinc-rich primer coatings. Judicious choice of alkoxide ligands allows the manufacture of soluble or liquid Si, Al, Mg, and Y derivatives. These are especially suitable for molecular doping and mixing in the manufacture of yttriastabilized zirconia, mullite, spinel, cordierite and other oxide ceramic precursors.
Databáze:	OpenAIRE
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