1、Designation: B 477 97 (Reapproved 2008)Standard Specification forGold-Silver-Nickel Electrical Contact Alloy1This standard is issued under the fixed designation B 477; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of las
2、t 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 75 % gold-22 %
3、 silver-3 %nickel alloy tubing, rod, wire, strip, and sheet material forsliding 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 consi
4、dered standard.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 pro
5、duct/materialas 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:2B 476 Specification for General Requirements for WroughtPrecious Metal Electrical Contac
6、t MaterialsE 384 Test Method for Microindentation Hardness of Ma-terials3. Manufacture3.1 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 (col
7、dworking, heat treating, annealing, turning, grinding, or pick-ling) as are required to produce the prescribed properties.4. Chemical Composition4.1 Material produced under the specification shall meet therequirements of chemical composition prescribed in Table 1.5. Mechanical and Electrical Require
8、ments5.1 The contract or order may specify ultimate tensilestrength and elongation, microhardness (Knoop or Vickers), ora combination of these mechanical properties as temper crite-rion. If the contract or order does not specify a temper criterion,then the criterion for temper designation will be ul
9、timatetensile strength and elongation.5.2 Mechanical properties shall conform to the listings ofTable 2.5.3 All test specimens shall be full size when practical.5.4 All tests are to be conducted at room temperature, about68F (20C).6. General Requirements6.1 Specification B 476 shall apply to all mat
10、erials producedto this specification.6.2 Microhardness, when performed, shall be in accordancewith Test Method E 384.7. Inspection and Testing7.1 Material furnished under this specification shall beinspected by the manufacturer as listed below:7.1.1 Visual inspection at 103,7.1.2 Temper test (hardne
11、ss or tensile),7.1.3 Dimensional tests, and7.1.4 Spectrographic or chemical analysis when indicatedby the purchase order.7.2 The purchaser shall perform such tests as are required toverify the quality of material procured under this specification.8. Keywords8.1 contacts; electrical contact alloy; go
12、ld alloy1This 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 May 1, 2008. Published June 2008. Originallyapproved in 1968.
13、 Last previous edition approved in 2002 as B 477 97 (2002).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.1C
14、opyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.APPENDIX(Nonmandatory Information)X1. TYPICAL PROPERTY VALUESX1.1 Table X1.1 contains a list of typical property valueswhich are useful for engineering calculations in electricalcontact d
15、esign and application.TABLE 1 Chemical CompositionElement Weight PercentGold 74.275.8Silver 21.422.6Nickel 2.63.4Selected base metals (lead, antimony, bismuth, tin,arsenic, cadmium, germanium, thallium,gallium, sulfur)0.01 max, totalTotal all base metal impurities (including above selectedbase metal
16、s)0.2 maxTotal noble metal impurities 0.1 maxTABLE 2 Mechanical PropertiesNOTE 1Wire 0.004 to 0.060-in. (0.1 to 1.5-mm) diameter and strip0.003 to 0.030 (0.08 to 0.8 mm) thick except as noted.Properties A BACDUltimate tensile strength,min, ksi40 50 70 65Elongation in 2 in.(51 mm), %10 min 8 min 1 to
17、 10 1 to 13Knoop hardness, 110-gload (50 g under0.005 in. (0.13 mm)thick)85 to 115 120 to 160 160 to 215 150 to 200AWire 0.004 to 0.020-in. (0.1 to 0.5-mm) diameter.TABLE X1.1 Typical Property ValuesTemperABCDResistivity, Vcmil/ft . 73 . 73Vcm . 12.1 . 12.1Density, g/cm315.8 15.8 15.8 15.8Solidus te
18、mperature, deg C 927 927 927 927Linear coefficient of thermal expansion per deg C (23100 C) . 14.8 3 106. 14.8 3 106Thermal EMF vs platinum (0100 C) V/deg C . 3 . 3Softening voltage, mV . 100 . 100Melting voltage, mV . 340 . 340Fatigue strength (rotating-bending) at 108stress reversalspsi . 35 000 .
19、 35 000MPa . 240 . 240Modulus of elasticity in tension:psi . 12 3 106. 12 3 106MPa . 82 700 . 82 700Proportional limitksi . 35 50 45MPa . 240 345 310Brinell hardness (15 kg load):Wire or rod 0.061 to 0.187 in. (1.53 to 4.8 mm) dia 120165B 477 97 (2008)2ASTM International takes no position respecting
20、 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 responsibility.This standar
21、d 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 addressed to ASTM International
22、 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 the address shown below.Thi
23、s 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 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).B 477 97 (2008)3
