ASTM A1054-2007 Standard Specification for Sintered Ceramic Ferrite Permanent Magnets《烧结陶瓷铁素体永久磁铁的标准规范》.pdf
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1、Designation: A 1054 07Standard Specification forSintered Ceramic Ferrite Permanent Magnets1This standard is issued under the fixed designation A 1054; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A num
2、ber in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers technically important, com-mercially available, magnetically hard sintered ceramic ferritepermanent magnets.1.2
3、 Ceramic ferrite magnets have residual magnetic induc-tion Br from 2000 G (0.2 T) up to about 5000 G (0.5 T) andintrinsic coercive field strength Hci(HcJ) from 2000 Oe(160 kA/m) up to about 5000 Oe (400 kA/m). Their specificmagnetic hysteresis behavior (demagnetization curve) can becharacterized usi
4、ng Test Method A 977/A 977M.1.3 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values givenin parentheses are mathematical conversions to SI units whichare provided for information only and are not consideredstandard.1.4 This standard does not purpo
5、rt to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A 34
6、0 Terminology of Symbols and Definitions Relating toMagnetic TestingA 977/A 977M Test Method for Magnetic Properties ofHigh-Coercivity Permanent Magnet Materials Using Hys-teresigraphs2.2 Other Standards:MMPA Standard No. 0100-00 Standard Specifications forPermanent Magnet Materials3IEC60404-8-1 Mag
7、netic Materials Part 8: Specifications forindividual materials Section 1 Standard specificationsfor magnetically hard materials4International Air Transport Association (IATA) DangerousGoods Regulations, Packing Instruction 90253. Terminology3.1 The terms and symbols used in this specification aredef
8、ined in Terminology A 340.4. Classification4.1 The classification of ceramic ferrite permanent magnetsis given in Tables 1 and 2, with cross-reference to MMPAStandard No. 0100-00 and IEC60404-8-1 standards.5. Ordering Information5.1 Orders for parts conforming to this specification shallinclude the
9、following information:5.1.1 Reference to this standard and year of issue/revision.5.1.2 Reference to an applicable part drawing.5.1.3 Magnetic property requirements if they are morestringent that the minimum values listed in the tables.5.1.4 Quantity required.5.1.5 The required magnetization state o
10、f the providedmaterial (unmagnetized, fully magnetized, magnetized andthermally stabilized, magnetized and partially demagnetized or“calibrated”). This information should appear on the partdrawing whenever possible.5.1.6 Certification of magnetic property evaluation.5.1.7 Marking and packaging requi
11、rements.5.1.8 Exceptions to this specification or special require-ments such as plating, coating, or functional testing as mutuallyagreed upon by the producer and user.6. Chemical Composition6.1 The general chemical composition of ceramic ferritemagnets is MO 6Fe2O3with M being barium, strontium, or
12、some combination of the two. New ferrite grades may also1This specification is under the jurisdiction of ASTM Committee A06 onMagnetic Properties and is the direct responsibility of Subcommittee A06.02 onMaterial Specifications.Current edition approved May 1, 2007. Published June 2007.2For reference
13、d ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from The International Magnetics Association (IMA), 8 SouthMichi
14、gan Avenue, Suite 1000, Chicago, IL 60603.4Available from IEC (International Electrotechnical Commission) Central Office3, rue de Varemb, P.O. Box 131, CH - 1211, GENEVA 20 Switzerland.5Available from IATA, 800 Place Victoria, PO Box 113, Montral, Quebec, H4Z1M1.1Copyright ASTM International, 100 Ba
15、rr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.include some rare earth elements. Chemical compositionslisted in the tables are typical and are not guaranteed.7. Physical and Mechanical Properties7.1 Typical thermal properties are listed in Appendix X1.7.2 Typical physi
16、cal properties are listed in Appendix X2.7.3 Physical density values are given for information pur-poses only and are not guaranteed.7.4 Ceramic magnets are used for their magnetic character-istics. The end-use application should not rely on them forstructural purposes due to low tensile and flexura
17、l strength.These materials are very brittle, and they chip and break easily.8. Magnetic Property Requirements8.1 Magnetic properties are listed in Tables 1 and 2.8.2 The values of essential magnetic properties listed in thetable are specified minimum values at +68F (+20C), deter-mined after magnetiz
18、ing to full saturation.8.3 The specified values of magnetic properties are validonly for magnet test specimens with a uniform cross-sectionalong the axis of magnetization. Properties for anisotropic(magnetically oriented) magnets are measured along the axis ofpreferred orientation.8.4 Because of the
19、 nature of permanent magnet production,magnetic testing of each lot is strongly recommended, espe-cially for applications where the magnet performance is closelyspecified. Such magnetic property evaluations shall be con-ducted in the manner described below. Where the magnet shapeis not suitable for
20、magnetic testing, a sample shall be cut fromthe magnet using appropriate slicing and grinding techniques,paying attention to any magnetic orientation within the magnet.8.4.1 The magnetic properties shall be determined in accor-dance with Test Method A 977/A 977M, or by using a suitable,mutually agre
21、ed upon magnetometer.8.4.2 When magnets are being purchased in the fullymagnetized condition, the testing shall determine the magneticproperties from the as-received magnetization state, followedby magnetization to full saturation and testing of the magneticproperties from the fully magnetized condi
22、tion.TABLE 1 Classification and Minimum Magnetic Property Requirements for Isotropic Sintered Ceramic Ferrite MagnetsMaterial Magnetic PropertiesASTMDesignationAMMPABriefDesignationOriginalMMPAClassIECBriefDesignationIECCodeReferenceMaximumEnergyProduct,MGOe(kJ/m3)RemanentInductionBr,gauss (mT)Norma
23、lCoerciveField Strength,Hc (HcB)oersted (kA/m)IntrinsicCoerciveField Strength,Hci(HcJ)oersted (kA/m)RelativeRecoilPermeability,rec G/OeCE-I-01 . . . S1-0-1 1.05 (8.4) 2300 (230) 1860 (148) 3250 (259) 1.2ADesignations are XX-Y-ZZZ where:XX = material type (CE = ceramic ferrite),Y = processing and ori
24、entation (I = isotropic (non-oriented), A = anistropic (oriented), andZZZ = numeric grade designation.TABLE 2 Classification and Minimum Magnetic Property Requirements for Anisotropic Sintered Ceramic Ferrite MagnetsMaterial Magnetic PropertiesASTMDesignationAMMPABriefDesignationOriginalMMPAClassIEC
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