Abstract

Boron carbide is one of the most promising structural ceramics; therefore its joining to other ceramics and metals is of technological importance. In this study, interface interactions and joints strength were studied in various cases of B₄C/Cu based fillers (Cu-9at%B, Cu-4.5at%Ti and Ticusil®). The fillers partially wet B₄C (q < 50⁰), but the interface composition and morphology are different. In the B₄C/Cu-9at.%B system no new phases are detected at the interface, while the formation of TiB₂ takes place in the case B₄C/Cu-4.5at%Ti, and a double layer containing TiB₂ and TiC is formed at the B₄C/Ticusil® interface.

The maximal shear stress for B₄C/B₄C joints breakage was obtained for the Cu-9at.%B brazing alloy which displays partial wetting without the formation of brittle phases at the ceramic/metal interface.

This study shows that improved wetting is essential but not sufficient in order to obtain strong bonding between B₄C and the fillers examined.

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