In this work the data about the surface properties of melts on a base of Sn, Pb, Inare given. It is shown, that the best effect of wetting at brazing alloys Al- 4 аt.% Li is attained with the help of an eutecticum of system stannum - aluminium. It is shown, that at photon bakeout of films of stannum on siliciums within 3-4 seconds improvement of their wetting by melts on a base of stannum is provided. Perspectivity of use of composition solders on a base of copper and a nickel imbued by melts of stannum with small additives alkaline and alkaline-earth elements is marked.

Keywords: surface properties, brazing, ceramics, wetting, photon annealing, aluminum, surface tension

The temperature dependence of the contact angle of wetting allows of Pb-Na of different concentrations on substrates of Co-Cr, Ni-Cr and stainless steel substrate 25X18H9C2 was studied by the method of a lying drop. Measurements were carried out by the method of a lying drop from 359°C to 800°C in an atmosphere of pure helium grade A. It is shown that the value of the wetting angle decreases with increasing temperature, wetting thresholds are observed.

Keywords: wetting angle polytherms, wetting threshold, Co-Cr, Ni-Cr, 25X18H9C2 substrates