Preparation and Cracterization of Alu1Inur Titanate Plabra Spray Powder

Autor: J. H. Wandass, C. Tirendi, V. T. Brice, F. M. Cambria, B. M. Su, Lieh-Jiun Shyu
Rok vydání: 1991
Předmět:
Zdroj: MRS Proceedings. 249
ISSN: 1946-4274
0272-9172
DOI: 10.1557/proc-249-115
Popis: Aluminum titanate ceramic powder, used in plasma spray coating as a wear resistant material, was prepared from a gel precursor followed by high temperature calcination. The chemically derived gel was made from aluminum sulfate and titanium isopropoxide in an oxalic acid aqueous system. The soluble complex was studied by 13C NMR spectroscopy which showed that the mole ratio of oxalic acid bound to Al and Ti was 2:1. A coprecipitation took place when ammonium hydroxide was added. The gel was examined by solid-state NMR spectroscopy which suggested that aluminum titanium hydroxyl oxalate was present with Al in a distorted octahedral environment. EDX mapping showed that Al and Ti were evenly distributed throughout the gel particles. Thermal analysis indicated that dehydration and combustion of organic groups took place between 100 and 400 ° C. Gel which was heat treated at 1500 °C was identified as a pure AI2TiO5 crystalline phase by XRD.
Databáze: OpenAIRE
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