With alumina sol as binder and Ni metal as sintering aids, the Fe-TiB, composite cathode material for aluminum electrolysis was prepared by cold press sintering, and the mechanical properties of the composite cathode material were measured. The electrolytic properties of the composite cathode were studied by 20A electrolysis test, and the composite cathode materials before and after the electrolysis test were carried out by using EDS. The migration behavior of various elements in the electrolysis process was studied by phase analysis. The results show that Ni metal can effectively fill the gap between the aggregate during the sintering process, which can improve the sintering density of the composite cathode material significantly. The voltage of the 20A electrolysis test is stable, the impurity of aluminum liquid is 0.42%, the aluminum liquid can moisten the cathode surface effectively, and it is an ideal wetting cathode material. In the process of electrolysis, the alkali metal is mainly permeated into the cathode material through the liquid electrolyte, the depth of the K element penetrates more deeply than the Na element, and the Al generated by the cathode surface will also enter the cathode through the gap of the composite material, and the Ni metal will also spread to the aluminum liquid layer by the gap inside the material, until it reaches the aluminum liquid layer to the relative balance.
cold pressed sintering