COMPOSITES FOR WET CATHODES AND THEIR USE IN ALUMINIUM PRODUCTION Russian patent published in 2013 - IPC C22C29/00 C23C4/10 C25C3/08 C23C24/08 

FIELD: metallurgy.

SUBSTANCE: composite has composition defined by formula (C-N-B-MR)_x(Al-MR)_y(R)_z, where MR is one or several carbides, nitrides or borides of one or more heat-resiatant metals of IV, V, VI groups, C-N-B-MR is one or several carbides, nitrides or borides of one or more heat-resistant metals of IV, V or VI groups, Al-MR is one or several aluminides of one or several aforesaid heat-resistant metals. Note here that if MR=Nb, Ta, Hf, Zr, Ti, V, then Al-MR=Al₃MR; is MR-W, Cr, then Al-MR=Al₄MR; if MR=Mo, then Al-MR=Al₈Mo₃ or Al₁₇Mo₄. Note here that the condition should be satisfied whereat if C-N-B-MR=TiB₂, Al-MR is not Al₃Ti; R is residual component other than carbon containing one or several phases from Al₄C₃, AlN, AlB₂, Al_1·67B₂₂, MR_tAl_u(C-N-B)_v, where t, u, v are numbers larger than or equl to zeto; x, y, z are volume fractions of appropriate components. Note here that x>y; x+y>0.5; x+y+z=1 and 0.01<y<0.5.

EFFECT: composite features good wettability due to decreased grain size and higher density of interface surface to allow using said composite as coating of components wetted by liquid aluminium.

12 cl, 15 dwg