EVALUATION OF CHROMIUM OXIDE AND MOLYBDENUM DISULFIDE COATINGS IN SELF-ACTING STOPS OF AN AIR-LUBRICATED RAYLEIGH STEP THRUST BEARING

摘要

Two coatings for a Rayleigh step thrust bearing were tested when coasting down and stopping under self-acting operation in air. The thrust bearing had an outside diameter of 8.9 cm 3.5 in.), an inside diameter of 5.4 cm (2.1 in.), and nine sectors. The load was 73 N (16.4 lbf).nThe load pressure was 19.1 kN/m² (2. 77 lbf/in.²) on the total thrust bearing area. The chro¬mium oxide coating was good to 150 stops without bearing deterioration, and the molybdenum di¬sulfide coating was good for only four stops before bearing deterioration. The molybdenum disul¬fide coated bearing failed after nine stops.