Designation:A1054−16StandardSpecificationforSinteredFerritePermanentMagnets1ThisstandardisissuedunderthefixeddesignationA1054;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoverstechnicallyimportant,com-merciallyavailable,magneticallyhardsinteredferriteperma-nentmagnets.1.2FerritepermanentmagnetshaveresidualinductionBrfrom0.2T(2000G)uptoabout0.5T(5000G)andintrinsiccoercivefieldstrengthHcJfrom160kA⁄m(2000Oe)uptoabout400kA/m(5000Oe).Theirspecificmagnetichysteresisbehavior(demagnetizationcurve)canbecharacterizedusingTestMethodA977/A977M.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesaremathematicalconversionstocustomary(cgs-emuandinch-pound)unitswhichareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A340TerminologyofSymbolsandDefinitionsRelatingtoMagneticTestingA977/A977MTestMethodforMagneticPropertiesofHigh-CoercivityPermanentMagnetMaterialsUsingHyster-esigraphs2.2OtherStandards:MMPAStandardNo.0100-00StandardSpecificationsforPermanentMagnetMaterials3IEC60404-8-1MagneticMaterialsPart8:SpecificationsforindividualmaterialsSection1–Standardspecificationsformagneticallyhardmaterials43.Terminology3.1ThetermsandsymbolsusedinthisspecificationaredefinedinTerminologyA340.3.2TermsthatarenotdefinedinTerminologyA340butareincommonusageandusedhereinareasfollows.3.2.1Recoilpermeability,µREC,isthepermeabilitycorre-spondingtotheslopeoftherecoilline.Forreference,seeincremental,relative,andreversiblepermeabilitiesasdefinedinTerminol...
