Funct. Mater. 2020; 27 4: 716-722.
Features of the contact interaction in the AlB12-NiCrBSiC system
I.Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanovsky Str., 03680 Kyiv, Ukraine
The contact interaction between a NiCrBSiC self-fluxing eutectic alloy and hot-pressed α-AlB12 aluminium dodecaboride ceramics has been investigated by the sessile drop method in vacuum at a temperature of 1823 K. The wetting kinetics was studied, and contact angles in this system were determined. It was found that the self-fluxing alloy wets the AlB12 ceramics with the formation of the contact angle θ = 35-40 deg, and in this case the interaction occurs due to the dissolution of the ceramics along the grain boundaries. The processes of diffusion of B and Al from the ceramic substrate into the NiCrBSiC drop are initiated, leading to a change in the chemical composition of the drop. Thus, according to the criterion of the contact angle and due to the intense nature of the interphase interaction in the self-fluxing alloy-AlB12 system, the use of the technology of liquid-phase sintering in the development of composite powder materials for wear-resistant thermal coatings is undesirable.
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