Control over Technological Parameters of Detonation Spraying for Producing Titanium Dioxide Coatings with Specified Wetting Properties

The water-repellent properties have been studied for the surface of a protective metal–ceramic coating based on titanium dioxide. It has been shown that the water-repellent properties of the coating surface can be efficiently changed by varying the technological parameters of spraying. When producing the coatings, technological parameters, such as the distance between a substrate and a detonation gun barrel (spraying distance) and the speed of barrel movement, have been varied. Regularities have been derived to relate the technological parameters of the detonation spraying of the coating and its contact angle. It has been found that, under certain conditions, the dependence of the contact angle on the spraying distance obeys a parabolic law. Parameters have been calculated for the phenomenological equation that adequately describes the observed parabolic dependence. The optimal values of the detonation spraying parameters necessary to achieve the maximum hydrophobicity of the produced coatings have been determined.