1、Designation: B477 97 (Reapproved 2017)Standard Specification forGold-Silver-Nickel Electrical Contact Alloy1This standard is issued under the fixed designation B477; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、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 U.S. Department of Defense.1. Scope1.1 This specification covers 75 % gold-2
3、2 % 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 co
4、nsidered 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 appropriateSafety Data Sheet (SDS) for this product/ma
5、terial as providedby the manufacturer, to establish appropriate safety and healthpractices, and determine the applicability of regulatory limi-tations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established
6、in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2B476 Specification for General Requirements for WroughtPrecious Metal
7、Electrical Contact MaterialsE384 Test Method for Microindentation Hardness of Mate-rials3. 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
8、 operations (coldworking, 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 El
9、ectrical Requirements5.1 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 design
10、ation will be ultimatetensile 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 B476 shall a
11、pply to all materials producedto this specification.6.2 Microhardness, when performed, shall be in accordancewith Test Method E384.7. Inspection and Testing7.1 Material furnished under this specification shall beinspected by the manufacturer as listed below:7.1.1 Visual inspection at 10,7.1.2 Temper
12、 test (hardness 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.1This specification is under the jurisdi
13、ction 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 April 1, 2017. Published April 2017. Originallyapproved in 1968. Last previous edition approved in 2012 as B4
14、77 97 (2012).DOI: 10.1520/B0477-97R17.2For 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.Copyright ASTM Internat
15、ional, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Gui
16、des and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.18. Keywords8.1 contacts; electrical contact alloy; gold alloyAPPENDIX(Nonmandatory Information)X1. TYPICAL PROPERTY VALUESTABLE 1 Chemical CompositionElement Weight PercentGold 74.275.8Silver
17、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 metals)0.2 maxTotal noble metal impurities 0.1 maxTABLE 2 Mechanical PropertiesNOTE 1Wire 0.004 t
18、o 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 10 1 to 13Knoop hardness, 110-gload (50 g under0.005 in. (0.13 mm)thick)85 to 115 120 to 16
19、0 160 to 215 150 to 200AWire 0.004 to 0.020-in. (0.1 to 0.5-mm) diameter.TABLE X1.1 Typical Property ValuesTemperABCDResistivity, cmil/ft . 73 . 73cm . 12.1 . 12.1Density, g/cm315.8 15.8 15.8 15.8Solidus temperature, deg C 927 927 927 927Linear coefficient of thermal expansion per deg C (23100 C) .
20、14.8 106. 14.8 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 . 35 000MPa . 240 . 240Modulus of elasticity in tension:psi . 12 106. 12 106MPa . 82 700 . 82 700Pr
21、oportional 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 120165B477 97 (2017)2X1.1 Table X1.1 contains a list of typical property valueswhich are useful for engineering calculations in electricalcontact design and application.AS
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25、 on Standards, at 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 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 97 (2017)3
