| abstract |
A SOLID LUBRICANT FILM COATING COMPOSITION IS PRODUCED BY ADMIXING A FINELY DIVDED SOLID LUBRICANT MATERIAL COMPRISING A MIXTURE OF MOLYBDENUM DISULFIDE (MOS2) AND ANTIMONY TRIOXIDE (SB2O3) INTO A SOLUTION OF A POLYPYROMELITAMIC ACID AND A SOLVENT THEREFOR. IN PARTICULAR, THE ACID IS DERIVED FROM THE REACTION BETWEEN PYROMELLITIC DIANHYDRIDE (PMDA) AND EITHER 4,4''-DIAMINODIPHENYL ETHER (DADPE) OR 4,4''-METHYLENE DIANILINE (MDA). THE SOLVENT FOR THE MDA ACID IS DIETHYLENE ACIDIMIDE WHILE THE SOLVENT FOR THE DADPE ACID IS A THREE TO ONE VOLUME RATIO OF OXYLENE AND PYRROLODINE. OPTIMUM RESULTS ARE OBTAINED WITH MDA ACID BY USING A 3 TO 1 RATIO OF MOS2 TO SB2O3 IN THE LUBRICANT MATERIAL AND A 79 TO 21 RATIO OF LUBRICANT MATERIAL TO MDA ACID (SOLIDS) IN THE ADMIXTURE. ALSO, OPTIMUM RESULTS ARE OBTAINED WITH DADPE ACID BY USING A 55 TO 45 RATIO OF MOS2 TO SB2O3 IN THE LUBRICANT MATERIAL AND A 66 TO 34 RATIO OF LUBRICANT MATERIAL TO DADPE (SOLIDS) IN THE ADMIXTURE. EITHER OF THE ADMIXTURES, AFTER APPROPRIATE DILUTION, IS SPRAYED ONTO A BEARING SURFACE OF A BEARING COMPONENT IN A LAYER APPROXIMATELY 0.0005 INCH THICK. THE LAYER IS BAKED AT APPROXIMATELY 200*F. TO EVAPORATE THE SOLVENT THEREFROM AND THEN AT ABOUT 575*F. TO CURE THE FILM BY CAUSING THE ACID IN THE FILM TO BE CONVERTED TO ITS CORRESPONDING POLYMIDE BY RING CLOSURE. FIBER GLASS REINFORCED BEARING COMPONENTS ARE FORMED UTILIZING THE POLYIMIDE COMPOSITION AS A BINDER FOR THE GLASS FIBERS AS WELL AS FOR THE LUBRICANT PIGMENT. THE FIBER GLASS REINFORCED COMPONENTS HAVE SOLID LUBRICANT CHARACTERISTICS AS WELL AS STRUCTURAL STENGTH, AND MAY BE MACHINED TO FORM BEARING SLEEVES OR RETAINERS. |