高温下前驱膜形成机制的研究进展

本文综述了高温下前驱膜的形成机制，即表面扩散机制、蒸发-凝结机制、皮下渗透机制和快速吸附-薄层漫流机制。在实验表征的金属/金属润湿体系中，最有可能的机制为皮下渗透机制，其形成与表观接触角、接触半径、固体金属与氧化膜的间隙大小有关。在金属/陶瓷体系中，前驱膜的形成通常为快速吸附-薄层漫流机制。前驱膜为吸附机制时，需要满足液/固界面的相对惰性和高亲和力这一矛盾体。同时介绍了高温反应润湿体系中，前驱膜的另一种可能的机制，即薄膜传输机制；指出研究前驱膜的难点在于前驱膜的不可预测性和不稳定性，其发展方向应趋于系统化，并建立相应的理论模型。

Research progress in formation mechanism of precursor film at high temperatures

The formation mechanisms of the precursor film (PF) at high temperature were reviewed, i.e., surface diffusion mechanism, evaporation-condensation mechanism, subcutaneous infiltration mechanism, and rapid absorption then film overflow mechanism. In the experimental metallic systems, the most possible mechanism is the subcutaneous infiltration mechanism, which is related to the apparent contact angle, contact radius, height of gap between the substrate metal and oxide film. In the metal/ceramic system, the formation of precursor film is usually rapid absorption then film overflow mechanism. The appearance of PF for adsorption mechanism needs to meet the contradiction of relative inertia and high affinity at the liquid/solid interface. Meanwhile, another possible mechanism of precursor film in high temperature reactive wetting system, namely film transport mechanism, is introduced. It was pointed out that the difficulty of studying precursor film lies in the unpredictability and instability of precursor film, and its development direction should be systematic, and the corresponding theoretical model should be established.