Zr_(55)Al_(10)Ni_5Cu_(30)非晶钎料熔体与α-Al_2O_3和ZrO_2陶瓷的润湿性

Wettability of molten Zr_(55)Al_(10)Ni_5Cu_(30) metallic glass brazing alloy on α-Al_2O_3 and ZrO_2

利用改良座滴法研究了Zr55Al10Ni5Cu30非晶钎料熔体与多晶-αAl2O3和ZrO2陶瓷的润湿行为和界面特征.结果表明,Zr55Al10Ni5Cu30/-αAl2O3体系具有极好的润湿性,在1 133-1 193 K温度范围内平衡接触角均为0.°Zr55Al10Ni5Cu30/ZrO2之间的润湿性较差,但在1 133-1 253 K温度范围内随着时间的延长,润湿性逐渐得到改善.两个体系均存在一定程度的界面反应.润湿动力学和界面显微结构的研究表明液滴合金中的活性元素（如Zr）在界面尤其是三相线前沿的吸附和堆积速度对润湿起了决定性的作用,而界面反应的贡献则相对较小.

The wettability and interfacial characteristics of molten Zr55Al10Ni5Cu30 metallic glass brazing alloy on polycrystalline α-Al2O3 and ZrO2 substrates were studied using a modified sessile drop method.The results show that the wettability of the Zr55Al10Ni5Cu30/α-Al2O3 system is excellent with the final contact angles approaching zero degree at 1 133-1 193 K.However,the wettability of the Zr55Al10Ni5Cu30/ZrO2 system is poor,but it can be progressively improved with the elapse of time during the isothermal dwelling in the temperature range of 1 133-1 253 K.A certain extent of interfacial reaction happens in both systems.The investigation on the spreading kinetics and interfacial microstructure indicates that the adsorption of the active atoms such as Zr at the interface,particularly at the triple junctions,plays a key role in determining the wettability,whereas the contribution of the interfacial reaction is relatively minor.