1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2006 11 16 Revised Inserted 3.0; Deleted 3.5, 3.6 & 4 1984 07 26 Released C902O-612206-C Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 1 of 2 COMPOSITE, NITRILE/PHENOLIC POLYESTER FIBERS - ESA-M99D46-A PTF
2、E IMPREGNATED - STEEL BACKED - BEARING 1. SCOPE The material defined by this specification is a steel backed, polytetrafluoroethylene impregnated nitrile/phenolic and polyester fibers composite bushing. 2. APPLICATION This specification was originally released for material used as power steering rac
3、k and pinion gear assembly, rack bearings. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.1 STEEL BACKING Cold rolled low carbon steel (0.10 - 0.2
4、0 Carbon). The outer, non-bearing surface is plated with ESF-M1P5-A, Plating, Cadmium and Zinc. The inner adhesive bonded surface is sand blasted (60 grit) prior to bonding. 3.2 COMPOSITE COMPOSITION AND THICKNESS 3.2.1 Surface Appearance The surface, as viewed on photomicrographs, has a random orie
5、ntation of polyester fibers and fiber ends in/on a resin base with edges of PTFE particles exposed. 3.2.2 Cross-Sectional Appearance Cross-sectional photomicrographs show a fiber-rich outer section and a resin-rich inner section. Small, triangular PTFE particles are distributed across the entire sec
6、tion with a greater density toward the outer section. 3.2.3 Composite Thickness 0.36-0.46 mm (Prior to broaching) 3.2.4 Polyester Fiber Matrix 50-75% of composite Thickness Range thickness ENGINEERING MATERIAL SPECIFICATION ESA-M99D46-A Printed copies are uncontrolled Copyright 2006, Ford Global Tec
7、hnologies, LLC Page 2 of 2 3.2.5 Composition by Thermogravimetric Analysis (By Weight) Polymers and other Volatiles (weight loss in Nitrogen) . First Step Components 51.0 - 53.0% . Second Step Components 14.5 - 18.5% . Decomposable Filler and/or other 2.0 - 4.0% Volatiles . Carbonaceous and/or Oxidi
8、zable 25.0 - 28.0% Residue (weight loss in air) . Ash, Inorganic Filler 1.0 - 2.5% 3.2.6 Differential Scanning Calorimetry . Glass Transition Temperature 182 - 187 C Nitrile/Phenolic . Melt of the Polyester, peak/onset 244-250/256-258 C . Crystalline Melt of the PTFE 308-310/324-326 C peak/onset 3.3
9、 BEARING COMPOSITE CRUSHING STRENGTH, min 207 MPa Apply a compressive load to a flat area of the bearing material. The bearing maximum change in section thickness is 3% as measured before and after loading. 3.4 BOND QUALITY No delamination (Composite Lining to Steel Backing) or cracking Test Method: Bend material through 180 around a 12.7 mm radius with the lining material on the outside of the bend. Delamination shall be checked by cutting across the liner with a sharp knife at the center of the bend radius and visually inspecting for separation.
