Wetting of molten cerium on typical carbon materials（graphite,CVD-diamond and NWCNT） and molten Cu-Ce alloys on graphite at 950℃

Ran Sui¹，Qiaoli Lin²，Le Wang²，Fan Yang²

1. Department of Materials Science and Engineering,Lanzhou Institute of Technology2. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal,Lanzhou University of Technology

摘 要：A series of experiments were conducted to investigate the wettability of graphite plate,graphite paper,NWCNTs Buckypaper,CVD-diamond by molten Ce and graphite plate by Cu-Ce binary alloy using a modified sessile drop method at 950℃.The remarkable apparent equilibrium contact angles（graphite plate（0°） <graphite paper（18°） <CVD-diamond（24°） <NWCNT（62°）） were obtained in the Ce/carbon system.When Ce concentration in Cu-Ce/graphite is above 20 at%,the wettability of graphite plate can be improved significantly.As a result,the dissolution of graphite into Ce makes infiltrated process proceeded easily due to the decrease of surface tension of liquid,which is different from Ce/graphite paper.In Ce/CVD diamond system,the dissolution of diamond layer and the decomposition reaction of WC lead to the good wettability.A relatively higher contact angle is caused by high stability of carbon wall in Ce/NWCNT system.The reaction product at interface and the decrease of surface tension due to surface tension-active character of Ce together induce the improved wettability.

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