OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 4 4 2 used in hydraulic structures, port and ship mechanisms instead of rolling bearings, antifriction bronze, babbit, caprolon. Most high-pressure hydropower plants in Russia and the CIS countries use this type of material. Materials and methods The following materials were selected: unfilled pure Polyamide P-610 and antifriction materials on a polymer (Polyamide) basis from the group of “Maslyanit” – Maslyanit D and Maslyanit 12. Metals were used as the material of the counterbody: stainless steel Cr18Ni9Ti, bronze (9 % Al; 2 % Mn), and titanium alloy VT-3. The tests were performed on the end friction machine (Figure 1). The upper head (4) with the test sample (3) is placed into a spindle (8) of the friction machine. The friction unit represents a cup (2) on selfadjustable bearings (11), into which a metal counterbody (9) fixed by a pin against rotation is placed. The friction force was determined using a strain gauge (1). Loading was ensured by a lever system (5, 6, 7) and a load (10). A sea water simulator is poured into the cup 25–30 mm above the friction plane, prepared in the following percentage ratio (to the working medium) of the main components: (NaCl – 2,42 %; СаCl2 – 0,12 %; NaSO4 – 0,4 %; Мg Cl2 – 1,1%)·6Н2О. The unit was cooled from overheating with an air stream using a fan. The test material samples represent annulus cross section plugs with slots in the form of sectors to ensure continuous access of the working medium (sea water simulator) to the friction zone. The contact ratio K = 1/3 (ratio of contact area to the full surface of the ring section). The shape and dimensions of Fig. 1. End friction machine
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