1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2003 10 09 Revised Para 3.0 inserted; para 3.6 and 4 deleted 1983 04 11 Released PCR CR896101-C Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 1 of 2 BEARING, STEEL BACKED, BRONZE-TFE, Pb IMPREGNATED ESA-M8
2、A6-B 1. SCOPE The material defined by this specification is a steel backed, tetrafluoroethylene and lead impregnated porous bronze bushing. 2. APPLICATION This specification was released originally for material used as strut and shock rod bearings. 3. REQUIREMENTS 3.1 STEEL BACKING Cold rolled low c
3、arbon steel 0.05 - 0.15% carbon. 3.2 LINING INTERLAYER MATERIAL AND THICKNESS 3.2.1 Composition, % Tin 10.0 - 12.0 Copper 83.0 - 87.0 Lead 3.0 - 5.0 Total Others 0.5 Max. 3.2.2 Average Thickness 0.009-0.013 in (0.23-0.33 mm) For initial approval section 30 bearings, mount and at 100 magnifications m
4、easure the thickness from the steel backing to highest bronze particle in four areas. Thickness will be the average of 120 readings. 3.3 OVERLAY COMPOSITION AND THICKNESS 3.3.1 Composition (% by volume) Polytetrafluoroethylene 73.3 - 83.7 Lead 15.5 - 25.5 Aluminum Oxide 0.8 - 1.2 ENGINEERING MATERIA
5、L SPECIFICATIONESA-M8A6-BPrinted copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 2 of 2 3.3.2 Average Film Thickness 0.0013 +/- 0.0003 in (0.033 +/- 0.008 mm) For initial approval use the 30 mounted sections from 3.2.2. At 100 magnifications measure the thickness of PTFE
6、in the four thinnest areas from the bronze particles to outer edge. Thickness will be the average of 120 readings. 3.3.3 Penetration Lubricant shall penetrate the lining material to a depth of 0.003 in (0.08 mm) min. 3.4 CRUSHING STRENGTH, min 40,000 psi (276 MPa) Apply load to PTFE-bronze lining. B
7、ronze interlayer must not be collapsed as determined by sectioning or by a 3% maximum change in section thickness as measured before and after loading. 3.5 BOND QUALITY (Steel Backing and Bronze) No flaking Test Method: Bend material through 90 around a radius not greater than 9-10 times the nominal
8、 steel thickness, with the lining material on the outside of the bend. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 OVERLAY LEAD COMPOSITION (% by volume) Lead/Tin Alloy 11.0 - 16.0 Difluoro Lead 4.5 - 9.5 Total Lead 15.5 - 25.5
