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By H. D. Megaw

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After a transient stage, a quasi-state configuration is established at the triple line where the advance of the liquid is hindered by the presence of a nonwettable substrate in front of the triple line. Thus, the only way to move ahead is by lateral growth of the wettable reaction product layer p until the macroscopic contact angle equals the equilibrium contact angle θF of the liquid on the reaction product (Reproduced with permission from [Eustathopoulos 1998], copyright (1998) Elsevier Ltd).

5) probably occurring by a similar process. However, due to the low thermodynamic activity of Si and the comparatively low temperature, the spreading time is very high (several hundreds of minutes). Similar phenomena occur with Ge–Si alloys on AlN [Cröll 2002]. BN is also an oxidizable ceramic but boron oxide, B2O3, which is liquid above 450 °C, is a volatile oxide such that clean BN surfaces are expected to form at higher temperatures, especially in high vacuum. Nonreactive metals such as Ga, Sn, Ag, Au do not wet BN at temperatures of 1000–1100 °C, the contact angle being in the range 130–150 ° [Naidich 1981].

18) consist in an upper limit. Overestimation of U is particularly high for θ > 30 °. 1 mPa s, is 11 m s−1. ) on steel at 1200 °C (µ = 102 Pa s) [J. Pech, M. Jeymond, N. Eustathopoulos, unpublished work]. flow but by the movement of atoms at the solid/liquid interface close to the triple line, as proposed by Blake [Blake 1993], who considered spreading as an adsorption–desorption process of the liquid atoms on the substrate surface. e. the activation energy of wetting which is an unknown quantity.

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