1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 02 2012 03 20 N Status No replacement named N. Benipal, NA 2006 03 22 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.6 and 4 1994 03 02 Released NE01-E-10127076-119 N. Adamowicz Controlled document at www.MATS Copyright 2012, Ford Global
2、Technologies, LLC Page 1 of 2 LOW FRICTION CORROSION RESISTANT WSE-M99J380-A SOLID FILM LUBRICANT COATING NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material described in this specification defines the composition, physical and functional characteristics of a thermoset resin bonded solid film lubric
3、ant coating used for piston skirt application. This coating provides very low friction and extremely low wear against conventional cylinder bore surfaces honed to standard 10 - 20 microinch surface finish. This material is also suitable for applications requiring extremely low wear and corrosion res
4、istance against most of the surfaces involving boundary lubrication conditions such as oil pump wear surfaces, cylinder bore surfaces, etc. 2. APPLICATION This specification was released originally for low friction wear resistant piston skirt coating for 4.6 L and 2.5 L modular engines. 3. REQUIREME
5、NTS Material specification requirements are to be used for initial qualification of materials. 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). 3.4 COMPOSITION Thermo
6、set Resin + Cross-linking Agent 45 - 60 wt % Molybdenum Disulfide 20 - 25 wt % Graphite 15 - 20 wt % Boron Nitride 5 - 10 wt % 3.5 PROPERTIES The solid film lubricant is applied on the piston surface, with proper surface preparation, in a thickness ranging from 10 to 50 microns (for the current pist
7、on application using a transfer film process the thickness range specified is 10 - 15 microns). Piston temperature is maintained at 21 - 32 C during the coating application process. Following the application, the coating is cured in two stages: 90 - 100 C for 15 minutes 200 - 210 C for 45 minutes Af
8、ter curing the coating becomes hard and attains grayish black color. ENGINEERING MATERIAL SPECIFICATION WSE-M99J380-A Copyright 2012, Ford Global Technologies, LLC Page 2 of 2 3.5.1 Adhesion Using proper surface preparation and application processes, the coating on the piston surface shall adhere fo
9、r the life of the engine and function under all the conditions the piston is exposed to in the engine. 3.5.2 Friction The frictional characteristics of the coating are: a. Friction Coefficient (Dry) at 0.04 - 0.06 Room Temperature (21 - 32 C) b. Friction Coefficient at 340 C 0.03 - 0.05 c. Friction
10、Coefficient in 5W - 40W Oil 0.03 - 0.06 at Loads Up to 10.3 mPa 3.5.3 Wear At the conditions shown above in 3.5.2, the wear against a counterface loaded with the coating (transferred onto the surface during a normal wear test) shall be 5 microns per/100 h initially and 1 micron/100 h after stabiliza
11、tion. 3.5.4 Corrosion Resistance Should show no peeling, delamination or distress when immersed in spent oil (drained from engine sump after at least 6000 miles or 200 h engine operation) maintained at 150 C for 200 hours. 5. GENERAL INFORMATION The information given below is provided for clarificat
12、ion and assistance in meeting the requirements of this specification. 5.1 MAXIMUM OPERATING TEMPERATURE OF COATING At contact loads not generating more than 0.1 MPa, 340 C Stand Along Coating On a load bearing substrate with up to 5.2 MPa 205 C On a load bearing substrate with up to 70 MPa, 340 C im
13、pregnant 5.2 CORROSION RESISTANCE - METHANOL FUELED ENGINES Cast iron or aluminum surfaces coated will resist formic acid corrosion in 5W30 oil/25% formic acid emulsion for at least 3 hours without distress. 5.3 Friction and Wear The friction coefficient of this coating decreases as the temperature
14、increases to 340 C from room temperature. By virtue of this unique behavior this coating allows ZERO clearance operation, which without this coating would cause severe scuffing. Specific examples of possible applications are the “gear type“ oil pumps, roots type blowers etc., where significant improvement in performance and durability can be achieved.
