Kinetics of Interfacial Reaction in SiCf/Ti6Al4V Composites

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The Ti6Al4V composites reinforced with Chinese SiC fiber was manufactured and then thermally exposed at 800°C, 900°C and 1000°C, respectively, for up to 500h. The interfacial reaction products were identified as TiC between Ti6Al4V and the C-coating of the SiC fiber. However, if the SiC fiber has no C-coating, the interfacial reaction forms TiC, Ti3SiC2, Ti5Si3(Cx) and Ti3Si(Cx). The thickness of the interfacial reaction zone was measured and it is found that the thickening rate is slower in the samples in which the SiC fiber has the C-coating. The growth of the interfacial reaction products is diffusion-controlled and the parameters of the growth kinetics, k0 and Q, were determined, respectively. The profile of the element distribution was calculated according to the diffusion theory and is well consistent with the expeimental data.

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Periodical:

Materials Science Forum (Volumes 546-549)

Edited by:

Yafang Han et al.

Pages:

1627-1632

Citation:

Y. Q. Yang et al., "Kinetics of Interfacial Reaction in SiCf/Ti6Al4V Composites", Materials Science Forum, Vols. 546-549, pp. 1627-1632, 2007

Online since:

May 2007

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$38.00

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[1] 2 Titanium Carbon a calculated m easured atomic fraction distance (µm ) 0 5 10 15 20 25.

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7 b Ti6Al4V Ti3Si TiC Ti5Si3Cx Ti3SiC2 SiC atomic fraction distance (µm) C Si Fig. 6 Calculated elements distribution in the interface of the composites with (a) and with no C-coating (b) on the surface of the SiC fibers and exposed at 800°C for 200h and at 1000°C for 270h, respectively.