Thin-coat ceramic finish and method for the production thereof, friction surfacebased on a thin-coat ceramic finish and method for the production thereof

摘要

The invention relates to oxide coatings and can be used in mechanical engineering, in addition to the chemical and petrochemical industries. A thin-coat ceramic finish consists of crystals of alpha-Al2O3 having a filiform structure with alternating arched and spiral areas and which are disposed within a matrix of gamma-Al2O3 and mullite 3 A2O32SiO2. The production of the thin-coat ceramic finish comprises the following: a powder mixture of 70 % SiO2 and 30 % Al2O3 is added to an alkaline electrol yte which contains liquid glass. The treatment is performed in a cathode-anode regime Jc/ Ja= 1.0-1.5. A friction surface based on the thin-coat ceramic finish consists of crystals of alpha- Al2O3 which come out directly onto the surface of friction outside the matrix of gamma-Al2O3 and mullite 3 A2O32SiO2. In order to obtain the friction surface, the coating is abraded. The hardness of an abrasive tool must be higher than resistance of a base of the friction surface and not lower than the resistance of filiform crystals of alpha- Al2O3. The abrasion is continued until a pseudoviscous layer is formed. The invention ensures increased micro-hardness and crack resistance which are the main criteria of the resistance of ceramic coatings.