1、Designation: B 685 01 (Reapproved 2006)Standard Specification forPalladium-Copper Electrical Contact Material1This standard is issued under the fixed designation B 685; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 a 60 % palla
3、dium-40 % copperalloy in the form of rod, wire, strip, and sheet material forelectrical contacts.1.2 The values stated in inch-pound units are to be regardedas the standard. The values in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if
4、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 establish appropriatesafety and health pra
5、ctices, and determine the applicability ofregulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B 476 Specification for General Requirements for WroughtPrecious Metal Electrical Contact Materials3. Manufacture3.1 Raw materials shall be of such quality and purity thatthe fini
6、shed 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 prescribed properties.4. Chemical Composition4.1 Material produced un
7、der the specification shall meet therequirements of chemical composition prescribed in Table 1.4.2 By agreement between purchaser and manufacturer,analysis may be required and limits established for elements orcompounds not specified in the table of chemical composition.5. Mechanical Requirements5.1
8、 The contract or order may specify ultimate tensilestrength, elongation, microhardness (Knoop or Vickers), hard-ness (Rockwell or Rockwell Superficial), or a combination ofthese mechanical properties as temper criterion. If the contractor order does not specify a temper criterion, then the criterion
9、for temper designation will be ultimate tensile strength andelongation. Table 2.5.2 Mechanical properties shall conform to the listings ofTable 3.5.3 All test specimens shall be full size when practical.5.4 All tests are to be conducted at room temperature, 65 to85F (18 to 29C).6. General Requiremen
10、ts6.1 The provisions of Specifications B 476 shall apply to allmaterials produced to this specification.7. Inspection and Testing7.1 Material furnished under this specification shall beinspected by the manufacturer as listed below:7.1.1 Visual inspection in accordance with 11.2.1 in Speci-fication B
11、 476.1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.05 on Precious Metals and Electrical Contact Materials.Current edition approved June 1, 2006. Published June 2006. Originallyapproved in 1981. L
12、ast previous edition approved in 2001 as B 685 01.2For referenced 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.TABLE 1 Che
13、mical RequirementsElement Weight, %PdCuBalance40.00 6 0.5Ag 0.10 maxFe 0.05 maxZn 0.06 maxCd 0.05 maxPb 0.03 maxAl 0.005 maxTotal other impurities 0.1Total impurities 0.21Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.1.2 Temper te
14、st (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 ispreferred when permitted by part size and quantity.7.1.3 Dimensional tests.7.1.4 Spectrographic or chemical analysis when indicatedby the pu
15、rchase order.7.2 The purchaser shall perform such tests as are required toverify the quality of material procured under the specification.8. Keywords8.1 contact alloy; electrical contact alloy; palladium; palla-dium copperAPPENDIX(Nonmandatory Information)X1. TYPICAL PHYSICAL PROPERTIES OF 60 Pd-40
16、CuX1.1 The following is a list of typical property valueswhich are useful for engineering calculations in electricalcontact design and application:Electrical resistivity, Vcm 35 (quenched)3.5 (ordered)Density, g/cm3at 20C 10.6Approximate liquidus, C 1225Approximate solidus, C 1195ASTM International
17、takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own
18、 responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be add
19、ressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at
20、 the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585
21、(phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 2 Typical Hardness Values for StripATemper HR30T HR15T HK (100 g)BAnnealed 64 82 15537 % reduction 81 92 255ASpecification for tensile and elongation properties or hardness ranges, but notboth,
22、shall be agreed to between supplier and purchaser at the time of contractingfor delivery.BThe Knoop hardness indentations shall be made so that the long axis of theindenter is parallel to the rolling direction of the material.TABLE 3 Mechanical Properties, Wire and RodTemper Ultimate Tensile Strength, psi (MPa) Minimum Elongationin 2 in. (51 mm), %min maxAnnealed 85 000(590)105 000(720)2075 % reduction 135 000(930)typical.B 685 01 (2006)2
