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Titanium diboride-coated boron fibre for aluminium matrix composites

1986; Elsevier BV; Volume: 117; Issue: 1-2 Linguagem: Inglês

10.1016/0022-5088(86)90014-7

1878-2728

J. Bouix, H. Vincent, M. Boubehira, J.C. Viala,

Advanced ceramic materials synthesis

Titanium diboride was deposited by chemical vapour deposition (CVD) from TiCl4 and H2 gases on a heated boron fibre. A thermodynamic analysis of this deposit was performed. The conditions to limit the formation of gaseous boron compounds were determined. The deposition rate increased with temperature. The CVD was controlled by a diffusion process. The morphologies of the deposits were correlated with the deposition parameters: substrate temperature and the H2:TiCl4 molar ratio. The diboride deposits exhibited a smooth or a nodular surface. Defects were found to be sensitive to deposition temperature and the duration of the treatment. The CVD conditions which lead to good mechanical properties were determined. The development of B-Al composites required the coating of a TiB2-B filament with a thin layer of aluminium.