Rotary microtribometer for evaluation of tribological properties of surfaces and coatings of construction materials

摘要

The three-point frictional contact element rotary micrometer with flexible head and thrust head for the evaluation of the tribological properties of surfaces and coatings of construction materials as a test facility allows microscopic and submicroscopic examination of friction and wear processes. The design consists of a flexible rotating head (1) consisting of three concentric circular rings. The outer ring (5) forms the frame and the central ring (6) and the inner ring (7) are rotatable relative to the X and Y axes. The axes of the joints (8) of one ring are perpendicular to the axis of the joints of the second ring. A sample (3) of the material to be tested is attached to the inner ring (7). The frame as an outer ring (5) is rotatable about the Z-axis and its rotational movement is performed by the drive unit (4). The contact pressure is provided by the pressure head (2), which forms the second member of the tribological pair and allows to place either three balls or three pins to form a three-point contact. An array of upper weights (12) and lower weights (13) of varying masses in conjunction with Earth's gravity provides the required normal force value Fn in the three-point contact of the friction bodies (11). The sample (3) of the material under test is subjected to forces, namely the vertical normal force Fy from the set of upper weights (12) and the lower weights (13) and the horizontal frictional force Ff, which is generated by the rotational movement in contact between the friction bodies (11) and sample (3) from the test material. The rotary movement of the pressure head (2) is captured by a force-sensitive force transducer (20) having one end tangled in the retainer clips (21) and the other free end of the blade engaging the notches in the upper weight system (12) and bottom weights (13) . The three-point contact solution and the flexibly attached sample (3) of the material to be tested make it possible to achieve a continuous and continuous supply of energy to the point of contact throughout the test.