硅硼玻璃在可伐合金表面的润湿规律

Wetting Behavior of Borosilicate Glass on Kovar Alloy

采用座滴法研究硅硼玻璃在分别具有FeO和FeO+Fe3O4氧化膜的可伐合金表面1000℃保温不同时间的润湿规律。用数码显微镜测量硅硼玻璃在可伐合金表面的接触角和润湿直径,用SEM研究晕圈的表面形貌以及玻璃和金属的截面形貌,并用能谱分析不同晕圈处的化学成分。结果表明:随着润湿时间的延长,玻璃在具有FeO和FeO+Fe3O4氧化膜的可伐合金表面的接触角不断减小并最终分别在25°和23°趋于稳定。可以观察到,在润湿过程中,熔融玻璃周围存在两个晕圈,可以根据接触角、晕圈和润湿直径的变化将润湿过程分成润湿初始期、润湿铺展期和润湿稳定期三个阶段。

The wettability of borosilicate glass on Kovar with oxides of FeO and FeO＋Fe3O4 respectively was studied as a function of holding time at 1000℃ by the sessile drop method. The contact angle and drop diameter were measured by the VHX-100K digital microscopy. The surface micrographs of halo and cross-sections of glass and kovar were investigated by SEM, and the chemical composition of halos was studied by EDS analysis. The results show that the contact angle all decreases as the time increases, and the final contact angles are 25° and 23° for FeO and FeO＋Fe3O4, respectively. Two halos are observed in the wetting process. By analyzing the change of contact angle, halo and drop diameter, wetting process could be divided into three stages： initial period, spreading period and equilibrium period.