Abstract
The phenomenon of reactive wetting at high temperature and its special issues are systematically discussed, focusing on the wetting behavior in metal/metal and metal/ceramic systems. Especially, based on the reaction product control (RPC) theory, the influence of wetting mechanism, spreading dynamics and interfacial reactivity on wettability and interfacial structure is deeply analyzed. The limitations of the classical RPC model under certain conditions are pointed out. In the ultra-fast spreading systems, the spreading dynamics cannot satisfy the prediction of RPC model, which is related to the formation of chemical bonds at the solid/liquid interface. Among them, the Gibbs free energy of the interface reaction does not directly point to the difference of wettability, but is reflected in the thickness of the reaction product layer. The greater the absolute value of Gibbs free energy of interface reaction, the thicker the thickness of precipitation layer. The mechanism leading to wetting is not always consistent with the spreading dynamics, the former is related to the bonding properties, and the latter is related to the slowest link leading to spreading.
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