INVESTIGATION OF FRICTION AND WEAR OF STEELS, A HARD ALLOY, AND POLYMER MATERIALS AT LOW TEMPERATURES
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSONAFB OH
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The article gives the results of friction and wear tests of hardened steels ShKh15, U10, 38KhMYuA, the hard alloy VK8, and polymer materials under different loads in a liquid nitrogen medium and the results of measurements of the hardness of tested specimens at both normal and low temperatures. The testing device shown in a figure was designed particularly for this purpose. In making the tests the clip with the specimens was fastened to the lower end of the shaft and another specimen was mounted immovably on the bottom of the cryochamber. Three specimens of the different steels 3 mm in diameter were installed in the top clip and under the application of a load had their faces pressed against the lower specimen of the disk. A belt drive transfers torque from the electric motor to vertical shaft. The cryochamber is mounted on a spherical radially seating bearing and connected with the elastic element by whose deformation the friction force was determined. The TKP-1 device for measuring hardness is shown in a figure. The steel and alloy tests showed that the dependence of wear on specific pressure in a liquid nitrogen medium is nonlinear in the general case. The greatest wear resistance was demonstrated by the friction pair of 38KhMYuA against itself.
- Laminates and Composite Materials
- Metallurgy and Metallography