A cathode assembly for an electrolysis cell of Hall-Héroult type for producing aluminium, comprising a graphitized cathode block of an electronic conductive material rodded to steel collector bars, Cu rods or a metallic collector plate, wherein, selected areas or parts of the surface of the cathode block are made of a wear resistant composite material comprising 5 - 80 wt% of a refractory metal boride powder such as TiB 2, HfB 2, ZrB 2, CrB 2, WB 2, or refractory metal carbide powder such as SiC, Cr 3 C 2, B 4 C, TiC, or Al 2 O 3, together with a carbonaceous material, the rest of the cathode block comprises conventional graphitized cathode material, wherein the wear resistant composite material is placed in the areas towards the ends of the cathode block, i.e. the areas 0-80 cm from the end of the cathode block, wherein the selected areas or parts of the surface of the cathode block made of a wear resistant composite material correspond to less than 100% of the total surface of the cathode block, wherein the cathode assembly is obtainable by a method, wherein either: (i) a green cathode block is prepared by adding a conventional cathode paste in the bottom of a conventional vibromold for cathode block production which is evened out with a rake or a similar tool before preparing pits in selected areas of the surface, wherein wear resistant composite material is filled in these pits and vibromolding is performed, followed by heat treatment such as baking or graphitization of the green cathode block in a similar manner as for conventional cathode blocks; or (ii) a green cathode block is prepared by adding a wear resistant composite material in selected areas in the bottom of a conventional vibromold for cathode block production, before adding the conventional cathode paste on top, which is then evened out by a rake or a similar tool and then vibromolded followed by heat treatment such as baking or graphitization of the green cathode block in a similar manner as for conventional cathode blocks. selected areas or parts of the surface of the cathode block are made of a wear resistant composite material comprising 5 - 80 wt% of a refractory metal boride powder such as TiB 2, HfB 2, ZrB 2, CrB 2, WB 2, or refractory metal carbide powder such as SiC, Cr 3 C 2, B 4 C, TiC, or Al 2 O 3, together with a carbonaceous material, the rest of the cathode block comprises conventional graphitized cathode material, wherein the wear resistant composite material is placed in the areas towards the ends of the cathode block, i.e. the areas 0-80 cm from the end of the cathode block, wherein the selected areas or parts of the surface of the cathode block made of a wear resistant composite material correspond to less than 100% of the total surface of the cathode block, wherein the cathode assembly is obtainable by a method, wherein either: (i) a green cathode block is prepared by adding a conventional cathode paste in the bottom of a conventional vibromold for cathode block production which is evened out with a rake or a similar tool before preparing pits in selected areas of the surface, wherein wear resistant composite material is filled in these pits and vibromolding is performed, followed by heat treatment such as baking or graphitization of the green cathode block in a similar manner as for conventional cathode blocks; or (ii) a green cathode block is prepared by adding a wear resistant composite material in selected areas in the bottom of a conventional vibromold for cathode block production, before adding the conventional cathode paste on top, which is then evened out by a rake or a similar tool and then vibromolded followed by heat treatment such as baking or graphitization of the green cathode block in a similar manner as for conventional cathode blocks. (i) a green cathode block is prepared by adding a conventional cathode paste in the bottom of a conventional vibromold for cathode block production which is evened out with a rake or a similar tool before preparing pits in selected areas of the surface, wherein wear resistant composite material is filled in these pits and vibromolding is performed, followed by heat treatment such as baking or graphitization of the green cathode block in a similar manner as for conventional cathode blocks; or (ii) a green cathode block is prepared by adding a wear resistant composite material in selected areas in the bottom of a conventional vibromold for cathode block production, before adding the conventional cathode paste on top, which is then evened out by a rake or a similar tool and then vibromolded followed by heat treatment such as baking or graphitization of the green cathode block in a similar manner as for conventional cathode blocks.