Fabrication of Al/TiB2 composites through gas pressure infiltration |
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Authors: | J M Molina J Tian J Narciso and E Louis |
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Affiliation: | (1) Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apdo 99, 03080 Alicante, Spain;(2) Departamento de F?sica Aplicada, Universidad de Alicante, Apdo 99, 03080 Alicante, Spain;(3) Departamento de Qu?mica Inorg?nica, Universidad de Alicante, Apdo 99, 03080 Alicante, Spain;(4) Institute of Material Science and Engineering, Ocean University of China, 266100 Qingdao, People’s Republic of China;(5) Unidad Asociada del Consejo Superior de Investigaciones Cient?ficas, Universidad de Alicante, Apdo 99, 03080 Alicante, Spain |
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Abstract: | Titanium diboride is being evaluated as a replacement of SiC in metal/ceramic composites for thermal management. Albeit these
composites are produced by gas pressure infiltration, no study of the process is available. This work presents an analysis
of the threshold pressure for infiltration of Al into TiB2 compacts and of the infiltration kinetics. Particles of diameters 14 and 20 μm, and spans of 1.62 and 1.77, were packed obtaining
a volume fraction of 0.63. The compacts were infiltrated in air with pure Al at 700 °C. Despite of the fact that the average
particle radii differ in a 50%, the threshold pressure for the coarser particles is only a 4% lower, while intrinsic compact
permeabilities (derived from infiltration of a wetting organic liquid) are identical. The origin of this apparently odd behavior
is the almost identical specific surface areas that those two particles have. Contact angles derived from infiltration experiments
are shown to be compatible with sessile drop results. |
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