1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2012 11 08 N-STATUS No longer in use A. Wedepohl, NA 2005 02 15 Revised Updated format 2002 10 31 Revised Rev para 3.7.4.1, updated & renumbered A. Reaume 1995 01 31 Activated S. DeGrood Controlled document at www.MATS Copyright 2012, Ford Gl
2、obal Technologies, LLC Page 1 of 2 MAGNET, PERMANENT, THERMOPLASTIC BONDED, WSF-M4L8-A1 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
3、 material used in ignition coils. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 SPECIFIC GRAVITY, min 4.50 (ISO 1183, Method A/ASTM D 792) 3.3
4、TENSILE STRENGTH, min 15.3 MPa (ISO R 527/ASTM D 638M) 3.4 FLEXURAL MODULUS, min 12.0 GPa (ISO 178/ASTM D 790M, Method I, procedure A) 3.5 IMPACT STRENGTH, IZOD-NOTCHED, min 9.7 J/m (ISO 180, Method A/ASTM D 256-92, Method A) 3.6 HEAT DEFLECTION TEMPERATURE, min 254 C (ASTM D 648, at .45 MPa) 3.7 MA
5、GNETIC PROPERTIES 3.7.1 Residual Induction (BR) - Gauss, max 3.7.1.1 At 23 +/- 2 C 4200 - 4700 3.7.1.2 At 140 +/- 2 C, min 3765 3.7.2 Coercive Force (HC), Oe, min 3650 at 23 +/- 2 C ENGINEERING MATERIAL SPECIFICATION WSF-M4L8-A1 Copyright 2012, Ford Global Technologies, LLC Page 2 of 2 3.7.3 Intrins
6、ic Coercive Force, kOe, (HCi) 3.7.3.1 At 23 C +/- 2 C 15 - 18.5 3.7.3.2 At 140 C +/- 2 C, min 8.1 3.7.4 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
7、all test 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
8、 an aluminum 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 temperatu
9、re prior 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. 3.7.4.1 Residual Induction (BR) -5.0% Max change 3.7.4.2 Intrinsic Coercive Force (HCi) -5.5% Max change 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 4.1 FILLER CONTENT, weight %, range 85 - 90
