1、Designation: B684 97 (Reapproved 2012)Standard Specification forPlatinum-Iridium Electrical Contact Materials1This standard is issued under the fixed designation B684; 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 an 85 % platin
3、um15 %iridium alloy, and a 90 % platinum10 % iridium alloy, in theform of 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
4、 information onlyand are not considered standard.1.3 The original specification, B684 - 81, covered the 85 %platinum 15 % iridium alloy. The 1997 revision of this speci-fication added the 90 % platinum 10 % iridium alloy.1.4 This standard does not purport to address all of thesafety concerns, if any
5、, 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 practi
6、ces, and determine the applicability ofregulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B277 Test Method for Hardness of Electrical Contact Mate-rialsB476 Specification for General Requirements for WroughtPrecious Metal Electrical Contact MaterialsE8 Test Methods for Te
7、nsion Testing of Metallic MaterialsE384 Test Method for Knoop and Vickers Hardness ofMaterials3. 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 b
8、y such operations (coldworking, annealing, turning, grinding, or pickling) as arerequired to produce the prescribed properties.4. General Requirements4.1 The provisions of Specification B476 shall apply to allmaterials produced to this specification.5. Chemical Requirements5.1 Material produced unde
9、r the specification shall meet therequirements of chemical composition prescribed in Table 1.5.2 By agreement between purchaser and manufacturer,analysis may be required and limits established for elements orcompounds not specified in the table of chemical composition.NOTE 1Analysis is regularly mad
10、e for the elements for which specificlimits are listed. If, however, the presence of “other” elements is suspectedor indicated in the course of routine analysis, further analysis shall bemade to determine that the total of these “other” elements and the listedimpurities is not in excess of the total
11、 impurities limit.6. Mechanical Requirements6.1 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
12、 specify a temper criterion, then the criterionfor temper designation will be ultimate tensile strength.6.2 The mechanical properties shall conform to those prop-erties listed in Table 2 and Table 3. The term “work hardened,”as used in these tables, refers to material which has beensubjected to a mi
13、nimum of 30 % reduction in crosssectionalarea.6.3 All test specimens shall be full size when practical.6.4 All tests are to be conducted at room temperature, 65 to85F (18 to 29C).1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct resp
14、onsibility of SubcommitteeB02.05 on Precious Metals and Electrical Contact Materials.Current edition approved Nov. 1, 2012. Published November 2012. Originallyapproved in 1981. Last previous edition approved in 2008 as B684 97 (2008).DOI: 10.1520/B0684-97R12.2For referenced ASTM standards, visit the
15、 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 International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Un
16、ited States17. Test Methods7.1 Test methods shall be in accordance with SpecificationB476.7.1.1 Knoop hardness tests shall be in accordance with TestMethod E384. Material 0.005 in. (0.13 mm) in thickness(diameter) and larger shall be tested using a 100-g indenterload. Material less than 0.005 in. (0
17、.13 mm) in thickness(diameter) shall be tested using a 50-g indenter load. Aminimum of five hardness indentations shall be made on eachspecimen. All indentations shall be made so that the long axisof the indenter is parallel to the rolling or drawing direction ofthe material. The hardness value repo
18、rted shall be the averageof the five indentations.7.1.2 All tension test specimens shall be full cross-sectionsize when practical (see Test Methods E8).7.1.3 All tests shall be conducted in room temperature, 65 to85F (18.3 to 29.4C).7.2 Chemical analysis shall be performed by spectrochemi-cal or wet
19、 analysis methods.8. Inspection and Testing8.1 Material furnished under this specification shall beinspected and tested by the manufacturer as listed below:8.1.1 Visual inspection per Specification B4768.1.2 Tension or hardness tests, or both, for temperverification,8.1.3 Dimensional inspection, and
20、8.1.4 Chemical analysis.9. Keywords9.1 electrical contact materials; iridium alloy; medical ma-terial; platinum alloy; platinum iridium alloysTABLE 1 Chemical RequirementsElement 85 Pt/15 Ir 90 Pt/10 IrWeight % Weight %Pt balance balanceIr 14.50-15.50 9.50-10.50Total Impurities 0.2 max. 0.2 max.Tota
21、l Platinum Group (Pd, Rh, Os, Ru), Au 0.1 max. 0.1 max.Total Other Impurities (including theelements below)0.1 max. 0.1 max.Pb, Sb, Bi, Sn, As, Cd, Zn 0.01 max each 0.01 max eachFe 0.015 max each 0.015 max eachOther elements 0.02 max each 0.02 max eachTABLE 2 Mechanical Properties of WireProperty 85
22、 Pt/15 Ir 90 Pt/10 IrAnnealed Work Hardened Annealed Work HardenedUltimate Tensile 75 - 85 90 - 120 35 - 60 70 minimumStrength, ksi (MPa) (520-590) (620-830) (240-410) (480 minimum)Elongation, % in 30 minimum 1 - 10 30 minimum 1 - 102 in. gage length (51 mm)Microhardness, HKTABLE 3 Mechanical Proper
23、ties of StripProperty 85 Pt/15 Ir 90 Pt/10 IrAnnealed Work Hardened Annealed Work HardenedUltimate Tensile 75 - 85 90 - 120 35 - 60 70 minimumStrength, ksi (MPa) (520-590) (620-830) (240-410) (480 minimum)Elongation, % in 30 minimum 1 - 10 30 minimum 1 - 102 in. gage length (51 mm)Microhardness, 130
24、 - 190 200 minimum 130 - 190 200 minimumHKB684 97 (2012)2APPENDIX(Nonmandatory Information)X1. TYPICAL PROPERTY VALUESX1.1 Typical property values of 85 % platinum15 %iridium are as follows:Density, g/cm321.6resistivity, .cm at 20C approx. 28solidus temperature, C approx. 1790liquidus temperature, C
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28、 ASTM Committee 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 ASTM website (www.astm.org/COPYRIGHT/).B684 97 (2012)3
