Mechanochemical Formation of Metal-Ceramic Composites

A mechanical activation technique has been used to form composites of alumina with titanium carbide, nitride, or carbonitride, both with and without elemental iron. The composites were formed by reacting elemental aluminum with either ilmenite (FeTiO3) or rutile (TiO2) concentrates in the presence o...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2000-01, Vol.83 (1), p.33-40
Main Authors: Welham, Nicholas J., Willis, Paul E., Kerr, Tony
Format: Article
Language:English
Subjects:
Aluminum
Coalescence
Coalescing
composites
formation
Ilmenite
Iron
Rutile
Titanium
Titanium carbide
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Summary:A mechanical activation technique has been used to form composites of alumina with titanium carbide, nitride, or carbonitride, both with and without elemental iron. The composites were formed by reacting elemental aluminum with either ilmenite (FeTiO3) or rutile (TiO2) concentrates in the presence of carbon and/or nitrogen in a ball‐mill at ambient temperature. The reaction was complete for the ilmenite samples after milling but was completed only for rutile under hot pressing conditions. Microhardness measurements indicated that the composites had hardnesses in the range 19–30 GPa (1740–2750 VHN), with only a small variation within each sample. Elemental mapping of the pressed pellets indicated that titanium and aluminum were evenly distributed on a submicrometer level whereas iron tended to coalesce into
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2000.tb01144.x