1、Designation: B 684 97 (Reapproved 2002)Standard Specification forPlatinum-Iridium Electrical Contact Materials1This standard is issued under the fixed designation B 684; 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 (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 an 85 % pla
3、tinum15 % iri-dium 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 the standard. The metric equivalents of inch-pound unitsmay be approximate.1.3 The original specif
4、ication, B 684-81, 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, associated with its use. It is theresponsibility of the user of this st
5、andard to become familiarwith all hazards including those identified in the appropriateMaterial Safety Data Sheet for this product/material as pro-vided by the manufacturer, to establish appropriate safety andhealth practices, and determine the applicability of regulatorylimitations prior to use.2.
6、Referenced Documents2.1 ASTM Standards:B 277 Test Method for Hardness of Electrical ContactMaterials2B 476 Specification For General Requirements for WroughtPrecious Metal Electrical Contact Materials2E8 Test Methods for Tension Testing of Metallic Materials3E 384 Test Method for Microindentation Ha
7、rdness of Ma-terials33. 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 (coldworking, annealing, turning, grinding, or pickling
8、) as arerequired to produce the prescribed properties.4. General Requirements4.1 The provisions of Specification B 476 shall apply to allmaterials produced to this specification.5. Chemical Requirements5.1 Material produced under the specification shall meet therequirements of chemical composition p
9、rescribed 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 made for the elements for which specificlimits are listed. If, however, the
10、 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 impurities limit.6. Mechanical Requirements6.1 The contract or order ma
11、y 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 criterionfor temper designation wi
12、ll 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,”1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of Subcommittee
13、B2.05 on Precious Metals and Electrical Contact Materials.Current edition approved Dec. 10, 1997. Published October 1998. Originallypublished as B 684 81. Last previous edition B 684 92.2Annual Book of ASTM Standards, Vol 02.04.3Annual Book of ASTM Standards, Vol 03.01.TABLE 1 Chemical RequirementsE
14、lement 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.Total 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 ma
15、x eachFe 0.015 max each 0.015 max eachOther elements 0.02 max each 0.02 max each1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.as used in these tables, refers to material which has beensubjected to a minimum of 30 % reduction in cro
16、sssectionalarea.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).7. Test Methods7.1 Test methods shall be in accordance with SpecificationB 476.7.1.1 Knoop hardness tests shall be in accordance with TestMethod E 384.
17、 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. (0.13 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
18、 shall be made so that the long axisof the indenter is parallel to the rolling or drawing direction ofthe material. The hardness value reported 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
19、 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 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
20、 Visual inspection per Specification B 4768.1.2 Tension or hardness tests, or both, for temper verifi-cation,8.1.3 Dimensional inspection, and8.1.4 Chemical analysis.9. Keywords9.1 electrical contact materials; iridium alloy; medical ma-terial; platinum alloy; platinum iridium alloysAPPENDIX(Nonmand
21、atory Information)X1. TYPICAL PROPERTY VALUESX1.1 Typical property values of 85 % platinum 15 %iridium are as follows:Density, g/cm321.6resistivity, V.cm at 20C approx. 28solidus temperature, C approx. 1790liquidus temperature, C approx. 1820TABLE 2 Mechanical Properties of WireProperty 85 Pt/15 Ir
22、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 Properties of St
23、ripProperty 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 - 190 200
24、 minimum 130 - 190 200 minimumHKB 684 97 (2002)2ASTM International 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,
25、 and the riskof infringement of such rights, are entirely their own 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 rev
26、ision of this standard or for additional standardsand should be addressed 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
27、 shouldmake your views known to the 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).B 684 97 (2002)3
