1、Designation: B628 98 (Reapproved 2010)Standard Specification forSilver-Copper Eutectic Electrical Contact Alloy1This standard is issued under the fixed designation B628; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l
2、ast revision. 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 72 % silver-
3、28 % copper (eu-tectic) alloy rod, wire, strip, and sheet material for electricalcontacts.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 stan
4、dard.1.3 This standard does not purport 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/mater
5、ialas provided by the manufacturer, to establish appropriatesafety and health practices, and determine the applicability ofregulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B277 Test Method for Hardness of Electrical Contact Ma-terialsB476 Specification for General Requi
6、rements for WroughtPrecious Metal Electrical Contact Materials3. General Requirements3.1 Specification B476 and Test Method B277 shall apply toall materials produced to this specification.4. Manufacture4.1 Raw materials shall be of such quality and purity thatthe finished product will have the prope
7、rties and characteristicsprescribed in this specification.4.2 The material shall be finished by such operations (coldworking, heat treating, annealing, turning, grinding, or pick-ling) as are required to produce the prescribed properties.5. Chemical Composition5.1 Material produced under the specifi
8、cation shall conformto the requirements as to chemical composition prescribed inTable 1.6. Mechanical Requirements6.1 The material shall conform to the mechanical propertiesprescribed in Table 2 or Table 3.6.2 All test specimens shall be full thickness or diameterwhen practical.6.3 All tests are to
9、be conducted at room temperature, about68F (20C).7. Inspection and Testing7.1 Material furnished under this specification shall beinspected by the manufacturer as detailed in the applicableprovisions of Specification B476 and as listed below.7.1.1 Visual inspection at 10 3.7.1.2 Temper test (hardnes
10、s or tension, but not both). Atension test is recommended for strip below 0.030-in. (0.8-mm)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.Cu
11、rrent edition approved Oct. 1, 2010. Published October 2010. Originallyapproved in 1977. Last previous edition approved in 2004 as B628 98 (2004).DOI: 10.1520/B0628-98R10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Ann
12、ual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 1 Chemical CompositionAElement Weight %Silver 71.0 to 73.0Copper balanceTotal of all impurities 0.15Zinc 0.06 maxIron 0.05 maxCadmium 0.05 maxLead 0.03 maxNickel 0.01 maxAluminum 0.005
13、 maxPhosphorus 0.03 maxTotal others 0.06 maxAAnalysis is regularly made for the elements for which specific limits are listed.If, however, the presence of “other” elements is suspected or indicated in thecourse of routine analysis, further analysis shall be made to determine that thetotal of these “
14、other” elements and the listed impurities are not in excess of the totalimpurities limit.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.thickness and for wire of any diameter. A tension test ispreferred when permitted by part size a
15、nd quantity.7.1.3 Dimensional tests.7.1.4 Spectrographic or chemical analysis when indicatedby the purchase order.8. Keywords8.1 composition; electrical contacts; impurities; preciousmetals; silver copper alloyTABLE 2 Mechanical Properties of Sheet and StripTemperReduction inB or through the ASTM we
16、bsite(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/dodssp.daps.dla.mil.B628 98 (2010)3
