Electrolytic properties and element migration in Ni-TiB_(2)/Al_(2)O_(3)composite cathode  

作　　者：Yu-Dong Liang Li-Jun Wang Deng-Peng Chai Sheng-Zhong Bao Ting-Ting Niu Jun-Wei Wang Ying Liu 

机构地区：[1]Rare Metals and Metallurgy Materials Research Institute,General Research Institute for Nonferrous Metals,Beijing 100088,China [2]Zhengzhou Nonferrous Metals Research Institute Co.,Ltd,Chaleo,Zhengzhou 450041,China

出　　处：《Rare Metals》2021年第1期57-64,共8页稀有金属（英文版）

基　　金：financially supported by the Major Science and Technology Projects of Henan Province(No.131100210700);the Major Science and Technology Programs of CHALCO(No.ZB2013CBBCe1)。

摘　　要：With alumina sol as binder and Ni metal as sintering aids,the Ni-TiB_(2)/Al_(2)O_(3) composite cathode material for aluminum electrolysis was prepared by coldpressed sintering.The mechanical properties of the composite cathode material were measured.Its electrolytic properties were identified by a 20-A electrolysis test.Cathode samples before and after electrolysis test were measured by energy-dispersive spectroscopy(EDS).The migration behavior of various elements in the electrolysis process was studied by phase analysis.The result shows 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 20-A electrolysis test is stable.The impurity of aluminum liquid is 0.42%.The aluminum liquid can wet the cathode surface effectively,and the Ni-TiB_(2)/Al_(2)O_(3) composite is an ideal wettable cathode material.In the process of electrolysis,the alkali elements in the electrolyte penetrate the electrode,where K goes deeper than Na.Al generated on the cathode surface will also penetrate the cathode through the gap of the composite material,while Ni in the electrode will spread into the aluminum liquid layer.

关 键 词：Aluminum electrolysis TiB_(2) Alumina sol Cold-pressed sintering INFILTRATION 

分 类 号：TF821[冶金工程—有色金属冶金] TB332[一般工业技术—材料科学与工程]