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

摘要

Rotary microtribometer with a flexible and pressure head with a three-point arrangement of friction contact members to evaluate the tribological properties of surfaces and coatings of construction materials as a test device enables 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 a frame and the middle ring (6) and the inner ring (7) are pivotable about 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 test material is attached to the inner ring (7). The frame as an outer ring (5) is pivotable about the Z axis and its rotary motion is performed by the drive unit (4). The pushing point to the contact point provides a thrust head (2) which forms the second member of the tribological pair and allows placing either three spheres or three spikes to form a three-point contact. The system of the top weights (12) and the lower weights (13) of different gravity in conjunction with earth gravity provide the required value of the normal force Fn in the three-point contact of the friction bodies (11). On the sample (3) of the test material, the force and the vertical normal force Fn from the system of the upper weights (12) and the lower weights (13) and the horizontal friction of the force Fj, which occurs during the rotational movement in contact between the friction bodies (11) and the sample (3) from the test material. The rotary movement of the pressure head (2) is captured by force sensor (20) planchett-shaped having one end latching in the holder (21) and the second free end of the planchett engaging in the notches in the system of the upper weights (12) and the lower weights (13) . Solution with three-point contact and flexibly attached sample (3) from the test material allows a continuous and continuous feeding of energy to the point of contact throughout the course of the test.