Wetting behavior of(Zr40Ti13Cu12Ni10Be25)99Nb1 amorphous melt and SiC ceramic substrate
The wettability and interfacial reaction between(Zr40Ti13Cu12Ni10Be25)99Nb1 amorphous melt and SiC substrate were studied under gravity using the high-temperature sitting drop method,and the effects of temperature,holding time,and spatial orientation on the wettability and interfacial characteristics of the two phases were investigated.The results show that the wetting and spreading process of alloy melt on the SiC substrate can be divided into three stages,both the dynamic and equilibrium contact angle between alloy melt and SiC decrease with the increase of temperature,which means higher temperature helps improve the wettability between amorphous melt and SiC solid.Under isothermal wetting,the contact angle decreases with the extension of holding time and finally reaches the equilibrium contact angle.In the ground gravity field,when the melt is located above and below the SiC substrate,the effect of gravity on the interface of the two phases is different,which leads to different wetting behaviors.The equilibrium contact angles of melt above the SiC substrate are 65.7°,61.0°,and 60.7°,respectively,after holding for 30 min at different temperatures,while the equilibrium contact angles of melt below the SiC substrate are 75.8°,65.9°,and 63.4°,respectively,and the former is smaller than the latter.When the temperature is higher than 880 ℃,ZrC and TiC phases are formed at the interface between the melt and SiC substrate,which could affect the amorphous forming ability and thermal stability of the alloy.
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