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.
基金
Project supported by the National Natural Science Foundation of China(51665031,51675256)
the Program of Innovation Groups of Basic Research of Gansu Province(17JR5RA107)
the Foundation of Collaborative Innovation Teams in College of Gansu Province(2017C-07)
Provincial Fund for Distinguished Young Scientists(1506RJDA087)。
