1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2012 11 08 N-STATUS No longer in use A. Wedepohl, NA 2003 07 25 Revised Para 3.0 inserted; Para 3.1, 3.2, 3.3, 3.10, 4 deleted 2000 01 27 Activated N. Vallabhanath Controlled document at www.MATS Copyright 2012, Ford Global Technologies, Inc.
2、 Page 1 of 2 MAGNET, PERMANENT, THERMOPLASTIC BONDED, WSF-M4L8-A2 ISOTROPIC NOT FOR NEW DESIGN 1. SCOPE The material defined by this specification is a polyphenylene sulfide bonded, neodymium iron boron magnet. 2. APPLICATION This specification was released originally to define material used in igni
3、tion coils. 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). 3.4 SPECIFIC GRAVITY, min 4.50 (ISO 1183, Method A/ASTM D 792) 3.5 TENSILE STRENGTH, min
4、20 MPa (ISO R 527/ASTM D 638M) 3.6 FLEXURAL MODULUS, min 7.0 GPa (ISO 178/ASTM D 790M, Method I, Procedure A) 3.7 IMPACT STRENGTH, IZOD-NOTCHED, min 18 J/m (ISO 180, Method A/ASTM D 256-92, Method A) 3.8 HEAT DEFLECTION TEMPERATURE, min 254 C (ASTM D 648, at .45 MPa) 3.9 MAGNETIC PROPERTIES 3.9.1 Re
5、sidual Induction (BR), Gauss, max 3.9.1.1 At 23 +/- 2 C As per Engineering Drawing 3.9.1.2 At 140 +/- 2 C, min 3,100 3.9.2 Coercive Force (HC), Oe, min 3,650 at 23 +/- 2 C ENGINEERING MATERIAL SPECIFICATION WSF-M4L8-A2 Copyright 2012, Ford Global Technologies, Inc. Page 2 of 2 3.9.3 Intrinsic Coerci
6、ve Force, kOe, (HCi) 3.9.3.1 At 23 C +/- 2 C 15 - 18.5 3.9.3.2 At 140 C +/- 2 C, min 13.5 3.9.4 Heat Aging Performance (45 h at 140 C followed by 955 h at 125 C with the procedure noted) Procedure: Conduct heat aging in a recirculating laminar air flow oven. Condition samples by magnetizing all test
7、 sample magnets with a field of 40 - 45 kOe. Using a hysteresisgraph, establish baseline second quadrant demagnetization curve using material from same lot as test sample lot. Heat age samples for 45 h at 140 C +/- 3 C followed by 955 h at 125 C +/- 3 C. Magnet test samples must be placed on an alum
8、inum sheet with a minimum of 2 inches apart and 2 inches away from any ferrous metals. Do not place samples on the bottom of the chamber. Samples should be loaded so as not to obstruct oven air flow in order to maintain uniform heating of samples. Allow test samples to cool to room temperature prior
9、 to testing. Determine BR and HCi for aged test samples without remagnetization. Percent change is determined by comparison of aged data with data from established baseline. 3.9.4.1 Residual Induction (BR), - 1.0% max change 3.9.4.2 Intrinsic Coercive Force - 6.5% (HCi), max change 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 Filler Content, weight %, range 85 - 90
