本文以Al_2O_3/中锰钢复合材料为对象,探讨了在不同温度和保温时间下Ce对润湿角的影响及其作用机理。结果表明,适量Ce或在较高的温度及较长的保温时间下,可以使润湿角显著下降,由不润湿转化为润湿。Ce改善润湿性的机理是其在界面上的吸附、富集及所产生的界面化学反应,反应产物是CeAlO_3。界面反应程度决定了最终润湿角的大小,建立的界面润湿角复合规则:cosθc=f_1cosθ_1+f_2cosθ_2较好地反映了润湿角的变化规律。
A proper amount of Ce added under elevated temperature and prolong-ed time may remarkably reduce the wetting angle, i. e., from non-wettable intowettable, between Al_2O_3 and medium manganese steel. The improvement on wetta-bility by adding Ce is due to the adhesion, accumulation and interaction at theinterface to produce CeAlO_3. The equilibrium wetting angle is determined by thedegree of interfacial reaction.
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