Designation:A1070−16StandardSpecificationforCastandSinteredAlnicoPermanentMagnets1ThisstandardisissuedunderthefixeddesignationA1070;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoverstechnicallyimportant,com-merciallyavailable,magneticallyhard,castandsinteredper-manentmagnetsknowncommonlyasAlnico.1.2Alnicomagnetshaveapproximatemagneticpropertiesofresidualmagneticinduction,Br,from0.52T(5200G)to1.35T(13500G)andcoercivity,HcB,from38kA/m(475Oe)to175kA/m(2200Oe).Theirspecificmagnetichysteresisbehavior(demagnetizationcurves)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,exceptasnotedin3.2.3.2TermsthatarenotdefinedinTerminologyA340butareincommonusageandusedhereinareasfollows.3.2.1Recoilpermeability,µ(rec),isthepermeabilitycorre-spondingtotheslopeoftherecoilline.Forreferenceseeincremental,relativ...
