SU1486892A1 - Device for determining adhesion of coating - Google Patents

Description

The invention relates to test equipment, is designed to determine the adhesion of coatings and improves the accuracy by both

2

specs of a given sample loading rate. Load on double shoulders; the lever is created by an eccentric, which is transmitted from the other end of the elastic rod through the transmission mechanism, the stem of the fungus and the grip on the test specimen. Performing a two-armed lever of elastic material provides a gradual sampling of free movements of the elements of the device and the accumulation of elastic force, leading to the separation of the coating from the substrate in the sample. The time law and the rate of loading of the sample set the shape of the eccentric. The simplest form. My eccentric is a disk with a rotation axis that is offset from its center. 3 il.

at-·'"'-*

<7

(

The invention relates to test tehnie, namely, devices for determining the adhesion of coatings to substrates.

The purpose of the invention is to improve the accuracy of determining the adhesion of the coating to the substrate by providing a given loading rate.

Figure 1 shows the proposed device, a General view; figure 2 is the same, front view; on fig.Z - the transmission mechanism, the measuring instrument of loading and capture.

The device contains a base 1 with a stand 2, hinged on the rack 2 a double-arm lever, made in the form of an elastic rod 3,

the loader, made in the form of an electric motor 4, a gearbox 5 with a variable gear ratio and an eccentric 6 connected to the gearbox 5 and one of the ends of the rod 3, the grip 7 of the test coating, a gear mechanism made in the form of a cylinder 8 with a window 9 in which

placed the other end of the rod 3, and

 .

pivotally connected to the cylinder 8, the cup 10 with an axial hole in the bottom 11, and a load meter, made in the form of a fungus 12 placed in the glass 10, the leg 13 of which is placed in the bottom hole 11 and connected to the gripper 7.

1486892

3

1486892

four

In addition, the device contains a spring 14 installed under the rod 3 and 'designed to preload the rod 3 to the eccentric 6, the screw 15 for fixing the cylinder 8 on the rod 3 and placed on the leg 13 of the fungus 12 piezoelectric element 16, two conductive washers 17 and two insulating washers 18,

In the base 1 on the side of the end of the rod 3 with a gear mechanism, a groove 19 is made to install the thrust 20 of the test sample 21 therein.

The device works as follows.

A test specimen 21 with a ply 20 mounted on it is inserted into the groove 19 of the base 1 and into the grip 7. Rotation of the screw 15 preliminarily presses the sample 21 to the base 1 by moving the rod 3 in the window 9 of the cylinder 8. Tight fit of the sample 21 to the bases) 1 eliminates the tangential component of the tearing force in the zone of contact of the coating with the substrate during the destruction of the sample. Turn on the electric motor 4 which, through the reducer 5, transfers the load to the eccentric 6 _} pressing the end of the rod 3. Since the other end of the rod 3 through the transmission mechanism, the leg 13 of the fungus 12 and the grip 7 are connected to the sample · 21 that rests against the base 1, the two shoulders starts bend relative pillar 2, as a result of which elastic forces appear in it. The distance between the head of the fungus 12 and the bottom 11 of the cup 10 begins to decrease and the load is transmitted through the washers 17 and 18 to the piezoelectric element 16. The compression strain signal of the piezoelectric element 16, converted into an electrical signal from the washers 17, goes to a self-recording device (not shown). Since the eccentric 6 gradually increases the load on the rod 3, a given loading rate of the sample 21 is ensured. When the elastic force of the rod 3 exceeds the adhesion strength of the coating to the substrate, the coating of the test sample 21 separates. The motor 4 is stopped, the spring 14 returns the double-arm lever to its original position. The time law and the rate of loading of the sample are determined by the shape of the eccentric 6. The simplest form of the eccentric is a disk with a rotation axis that is offset from its center.

Claims (1)

Claim A device for determining the adhesion of coatings, containing a base with a stand, a double-arm lever hinged on a rack, a loader, a gripping of the test coating and a load meter, characterized in that, in order to improve the accuracy of determining adhesion by providing a given loading rate, the lever is made in. as an elastic rod, and the device is equipped with an eccentric associated with the loader and with one of the ends of the rod, and a gear mechanism made in the form of a cylinder with a window in which the other end of the rod is placed, and pivotally connected to the cylinder of a glass with an axial hole in the bottom, and the load meter is made in the form of a fungus placed in a glass, the leg of which is placed in the bottom hole and connected to the grip. 1486892 I 1486892