DEVICE FOR DETERMINING ADHESIVE AND COHESIVE STRENGTH OF GAS THERMAL COATINGS ON SAMPLES Russian patent published in 2012 - IPC G01N19/04 

FIELD: machine building.

SUBSTANCE: device for determining the adhesive strength of gas thermal coatings, contains a substrate made in two detachable parts and a coating placed between them. One part is made is in the form of a fixture with a hole in a shape of a truncated cone and a cylinder of diameter D conjugate with its lesser base, the other is made in the form of a pin installed in the cylindrical part of the hole, and the cover is placed both in the conical part, and on the end working surface of the pin. At that the end of the fixture on the side of the larger diameter of the truncated cone is made conical and forms together with the surface of a truncated cone a collar of triangular profile, upon which the collar is also deposited. Height H of a truncated cone and the diameter D of the pin are selected from the condition of 2H> D, when nominal diameter of the pin and the cylinder coincide. At that the fixture is installed in the cassette through the fitting, which is mounted on the base by removable racks, located parallel to the band, in which an adjuster screw is coaxially mounted with a possibility of axial movement comprising an outer spherical surface, through which it affects the bottom surface of the pin, changing H_C - the value of embedding of the working surface of a pin in a cylinder part of the fixture, fixing the position of the working surface of the pin relative to the lower (small) hole of a truncated cone of teh fixture. In the case of zero embedding of the working surface of the pin, i.e., H_c=0, the adhesive bond of coating and the substrate is determined, and at H_c>0 the cohesive bond in longitudinal layers of the coating is determined. Moreover, in determining the cohesive bond in the coating the pin is mounted embedded into the cylindrical part, keeping the ratio of H_can>H_c, where H_can is the height of the coating layer in the conical part of the cage, mm; H_c. is the height of the coating layer in the cylindrical part of the cage, mm.

EFFECT: broadening the range of control of the strength of adhesive and cohesive bond in the longitudinal layers of thermal coatings, simultaneous control of several samples.

4 cl, 1 dwg