FIELD: measuring technology.
SUBSTANCE: invention relates to a measuring technology for determining the adhesive strength of thin hard coatings on pliable substrates. The diamond pyramid tip is loaded and embedded into the coating surface on a pliable substrate to a depth that ensures the coating is detached from the base during unloading. An experimental embedding diagram is recorded in the form of load change curves from the embedding depth with increasing and then decreasing the load to zero. The values of the maximum load and the corresponding embedding depth are fixed. The effective modulus of elasticity and composite hardness of the coating on a pliable substrate are calculated. The theoretical loading and unloading curves are graphically constructed in the form of a model implementation diagram. After that, the model implementation diagram is combined with the experimental implementation diagram of the layered body. The unloading curve in the experimental implementation diagram is completed, describing a variant of the experimental implementation diagram with a coherent connection of the coating to the substrate. Areas in the experimental implementation diagram are identified that differ from similar areas of the model implementation diagram. The nature of the formation of these areas is analyzed. The amount of work spent on the elastic restoration of the exfoliated coating during unloading is calculated, as a quantitative difference in the areas of the distinctive areas. The amount of work spent on the elastic restoration of the exfoliated coating is compared with the area of the figure in the form of a triangle, one of the sides of which forms an acute angle with the axis of the abscissa. The value of the adhesive strength of the coating is calculated based on the tangent of this angle according to the known formula.
EFFECT: improved accuracy and objectivity in determining the adhesive strength of thin coatings on pliable substrates.
5 cl, 3 dwg, 1 tbl
