高表面能固体的润湿性实验及表面张力计算

Wettability of High Surface Energy Solid and its Surface Tension Calculation

采用座滴法在1100℃及氩气与CO混合气氛的环境中,研究了Au、Ag、Cu、Ge、Sn五种金属在Al2O3、SiO2、ZrO2、高定向热解石墨的(0001)基面四种固体表面上的润湿性,用ADSA滴形分析软件测量了接触角。通过新的理论方程分别计算了四种固体材料的表面张力。结果表明,在同一种陶瓷表面上,接触角随着金属液体表面张力的增加而增大,所计算的固体表面张力数值具有较好的一致性,表明所建立的理论公式能够正确反映液、固、气三相之间的张力平衡关系。在1100℃时,上述四种固体材料表面张力的平均值分别为340.24、457.79、357.52、431.35(mJ.m-2)。

The wetting of Au, Ag, Cu, Ge and Sn on the Al2O3, SiO2, ZrO2 and （0001） basal plane of highly oriented pyrolytic graphite （HOPG） was investigated by sessile drop method under argon mixture CO atmosphere at 1100℃. The contact angles were measured by ADSA software. The surface tensions of four substrates were calculated by new theoretical equation. The results show that the contact angles on the same ceramic surface increase with an increase of liquid metal surface tensions, the solid surface tension calculated with the new theoretical equation is well consistent, which indicates that the establishing theoretical formula can correctly reflect the equilibrium relation of tension among liquid, solid and vapor phases. The average values of surface tension of four substrates mentioned above are 340.24, 457.79, 357.52, 431.35（mJ·m^-2 ） respectively at 1100℃.