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

• 作者: Ran Sui Qiaoli Lin Le Wang Fan Yang
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: RARE EARTHS APPLICATIONS
• 页码范围: 331-339
• 页数: 9页
• 语种: 英文

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.