Synthesis of boride and nitride ceramics in molten aluminium by reactive infiltration |
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Authors: | M Kobashi T Choh |
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Affiliation: | (1) Department of Materials Processing Engineering, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku Nagoya 464-01, Japan |
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Abstract: | The infiltration of solid powder mixtures with molten aluminium has been investigated as a potential route for the synthesis
of ceramic/metal composites. Either titanium or tantalum powder was mixed with boron nitride flakes for the reaction powder
mixture. The infiltration occurred spontaneously at 1473K for both Ti+BN] and Ta+BN] powder mixtures. Owing to reactions
between the starting materials, both boride and nitride ceramics were produced in molten aluminium. TiB2 and AlN were produced
from the Ti+BN] powder mixture, and TaB2 and AlN were produced from the Ta+BN] powder mixture. When the Ti+BN] powder mixture
was used, a reaction producing Al3Ti took place immediately after the infiltration of the molten aluminium, and a subsequent
reaction producing TiB2 and AlN proceeded gradually. The time required to convert BN flakes to TiB2 and AlN particles at 1473K
was in the range of 1800–3600 s. On the other hand, when the Ta+BN] powder mixture was used, there was an initial incubation
period to allow the tantalum and molten aluminium to react with each other. The reaction between tantalum, BN and aluminium
took place after this incubation period.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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