Flash joining of CVD-SiC coated C f /SiC composites with a Ti interlayer

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Abstract

Flash joining of CVD-SiC coated C f /SiC samples with a Ti interlayer was achieved using a Spark Plasma Sintering machine. The influence of different heating powers and discharge times were investigated. The sample flash joined at a maximum heating power of 2.2 kW (peak electric current of 370 A) within 7 s showed the highest apparent shear strength of 31.4 MPa, which corresponds to the interlaminar shear strength of the composites. A maximum joining temperature of ∼1237 °C was reached during the flash joining. An extremely rapid heating rate of 9600 °C/min combined with a very short processing time hindered any reaction between the CVD-SiC coating and the Ti interlayer. The formation of a metallic joint (Ti based) in the absence of any detectable reaction phase is proposed as a new joining mechanism. For a conventionally joined SPS sample, the formation of titanium silicide phases inhibited the formation of a bond.

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Tatarko, P., Grasso, S., Saunders, T. G., Casalegno, V., Ferraris, M., & Reece, M. J. (2017). Flash joining of CVD-SiC coated C f /SiC composites with a Ti interlayer. Journal of the European Ceramic Society, 37(13), 3841–3848. https://doi.org/10.1016/j.jeurceramsoc.2017.05.016

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