Розрахунок роботи адгезії і контактного кута змочування в залежності від температури в системах розплав - твердий метал

• Дата: 2025
• Автор: Syrovatko, Yu. V.
• Формат: Стаття
• Мова: English
• Опубліковано: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2025
• Теми: температурна залежність кута змочування; робота адгезії; проходження частинки над потенційним бар’єром; відбивання частинки від потенційного бар’єра; де Бройлева хвиля; квантове число
• Онлайн доступ: https://www.cpts.com.ua/index.php/cpts/article/view/796
• Назва журналу: Chemistry, Physics and Technology of Surface

The contact and capillary properties of metal melts, processes of solid surface wetting by them, and adhesion of metal to the solid surface are the main characteristics determining the various technological processes during which the liquid metal or alloy comes into contact with the surface of the harder, more refractory substance. When conducting the various metallurgical processes, it is necessary to determine the temperature effect on the nature of wetting of the solid phase by the liquid one. Therefore, calculation of the wetting threshold temperature, i.e. the temperature at which the contact angle decreases sharply because of significant increase in the work of adhesion in nonequilibrium          melt–solid metal systems, is of great practical importance. In this regard, the work objective was to calculate the change in the work of adhesion and the contact angle as dependent on the temperature for melt-solid metal systems. Our model was constructed based on the concepts of the Wentzel–Kramers–Brillouin quasiclassical quantum theory. The fundamental elements of the proposed model are the values of quantum numbers, directly depending on the temperature. The temperature at which the quantum number of the system changes from the integer to half-integer determines the wetting threshold, that is, a sharp improvement in the system wetting. Interaction of the melt ions with the substrate atoms is considered indirectly through the formation of a potential barrier. According to the           Wentzel–Kramers–Brillouin concepts, passage or reflection of a particle with the reduced mass over the barrier is determined by the integer or half-integer ratio of the de Broglie wave and linear dimensions of the potential barrier. According to the results of calculations, the curves of dependence of the contact angle on the temperature for the       Sn–Al, Pb–Al, Sn–Cu and Pb–Cu systems were constructed. Their comparison with the curves of dependence of the contact angle on the temperature of the same systems, constructed experimentally by the other authors, shows that these curves have similar dynamics. Thus, with the use of the presented method it is possible to determine by calculation the work of adhesion and the contact angle in the melt-solid metal systems.