Abstract
Titanium diboride (TiB 2 ) was hot-pressed at 1800 °C with aluminum nitride (AlN) as a sintering aid. The presence AlN had a strong influence on the sinterability and mechanical properties of the TiB 2 . When a small amount (⩽5 wt.%) of AlN was added to the TiB 2 the titania (TiO 2 ) present on the surface of the TiB 2 powder was eliminated by a reaction with AlN to form TiN and Al 2 O 3 . The elimination of TiO 2 markedly improved the sinterability and consequently the mechanical properties of TiB 2 . However, when too much AlN was added (⩾10 wt.%), the sinterability and the mechanical properties decreased, apparently due to the remaining unreacted AlN.
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