1、Designation:B68301(Reapproved 2012)Standard Specification forPure Palladium Electrical Contact Material1This standard is issued under the fixed designation B683;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisio
2、n.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This specification covers palladium in the form of rod
3、,wire,strip,and sheet material for electrical contacts.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purp
4、ort to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified in the appropriateMaterial Safety Data Sheet(MSDS)for this product/materialas provided by the manufacturer,to est
5、ablish appropriatesafety and health practices,and determine the applicability ofregulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2B476 Specification for General Requirements for WroughtPrecious Metal Electrical Contact MaterialsB589 Specification for Refined Palladium3.Ma
6、nufacture3.1 Raw materials shall be of such quality and purity thatthe finished product will have the properties and characteristicsprescribed in this specification.3.2 The material shall be finished by such operations(coldworking,annealing,turning,grinding,or pickling)as arerequired to produce the
7、prescribed properties.4.Chemical Composition4.1 Material produced under this specification shall meet therequirements of chemical composition prescribed in Table 1.NOTE1The chemical requirements for unfabricated palladium(re-fined material)are covered in Specification B589.4.2 Byagreementbetweenthep
8、urchaserandthemanufacturer,analysis may be required and limits establishedfor elements or compounds not specified in the table ofchemical composition.5.Mechanical Requirements5.1 The contract or order may specify ultimate tensilestrength,elongation,microhardness(Knoop or Vickers),hard-ness(Rockwell
9、or Rockwell Superficial),or a combination ofthese mechanical properties as temper criterion.If the contractor order does not specify a temper criterion,then the criterionfor temper designation will be ultimate tensile strength andelongation.5.2 Mechanical properties shall conform to the listings ofT
10、able 2.5.3 Since it is not always possible to tension test some partsand shapes,the user and supplier should reach an agreementwith respect to the type of hardness tests and the acceptablerange that should be applicable.See Table 3 for typicalhardness values.5.4 All test specimens shall be full size
11、 when practical.5.5 All tests shall be conducted at room temperature,65 to85F(18 to 29C).6.General Requirements6.1 The provisions of Specification B476 shall apply to allmaterials produced to this specification.7.Inspection and Testing7.1 Material furnished under this specification shall beinspected
12、 by the manufacturer as listed below:7.1.1 Visual inspection in accordance with the Inspectionsection in Specification B476.7.1.2 Temper test(hardness or tension,but not both).Atension test is recommended for strip below 0.030 in.(0.8 mm)thickness and for wire of any diameter.A tension test isprefer
13、red when permitted by part size and quantity.7.1.3 Dimensional tests.7.1.4 Spectrographic or chemical analysis when indicatedby the purchase order.1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.05
14、 on Precious Metals and Electrical Contact Materials.Current edition approved May 1,2012.Published May 2012.Originallyapproved in 1980.Last previous edition approved in 2006 as B683 01(2006).DOI:10.1520/B0683-01R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Cus
15、tomer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.2 The purchaser shall perform such test
16、s as are required toverify the quality of material procured under the specification.8.Keywords8.1 contact alloy;electrical contact alloy;palladiumAPPENDIX(Nonmandatory Information)X1.TYPICAL PROPERTY VALUESX1.1 The following is a list of typical property values whichare useful for engineering calculations in electrical contactdesign and application:Electrical conductivity,%IACS(at 20C)Resistivity:16Vcmil/ftVcm64.810.8Density:g/cm3tr oz/in.312.026.33Solidus temperature,CLiquidus temperature,CModu
