

Author: Welham N.
Publisher: Springer Publishing Company
ISSN: 1543-1940
Source: Metallurgical and Materials Transactions A, Vol.31, Iss.1, 2000-01, pp. : 283-289
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Abstract
A mixture of rutile, boron oxide, and graphite has been mechanically milled for 1, 10, and 100 hours with the intention of forming titanium diboride during subsequent thermal treatment. The resultant powders were examined after isothermal annealing by X-ray diffraction (XRD) to determine the effect of milling on the formation of TiB2. No reaction was found to occur during milling, even for milling times of 100 hours. Annealing of the milled samples resulted in the formation of TiB2 at temperatures as low as 1000°C for the 100 c-hour milled powder. The reaction mechanism during thermal processing changed with milling time, with TiBO3 predominant in samples milled for >1 hour, whereas Ti
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