1、Designation: B684 97 (Reapproved 2012)B684/B684M 16Standard Specification forPlatinum-Iridium Electrical Contact Materials1This standard is issued under the fixed designation B684;B684/B684M; the number immediately following the designation indicates theyear of original adoption or, in the case of r
2、evision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript 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. Scope Scope*1.1 This
3、 specification covers an 85 % platinum15 % iridium alloy, and a 90 % platinum10 % iridium alloy, in the form ofrod, wire, strip, and sheet material for electrical contacts.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values given inparen
4、theses are mathematical conversions to SI units that are provided for information only and are not considered stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with th
5、e standard.1.3 The original specification, B684 - 81, covered the 85 % platinum 15 % iridium alloy. The 1997 revision of this specificationadded the 90 % platinum 10 % iridium alloy.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the r
6、esponsibilityof the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety DataSheet (MSDS)(SDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices,and determine the applicab
7、ility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B277 Test Method for Hardness of Electrical Contact MaterialsB476 Specification for General Requirements for Wrought Precious Metal Electrical Contact MaterialsB542 Terminology Relating to Electrical Contacts and
8、 Their UseE8E8/E8M Test Methods for Tension Testing of Metallic MaterialsE384 Test Method for Microindentation Hardness of Materials3. Terminology3.1 For definitions of terms related to electrical contact materials, refer to Terminology B542.4. General Requirements4.1 The requirements of Specificati
9、on B476 shall apply to all materials produced to this specification.4.2 In addition, when a section with a title identical to that referenced in 4.1 appears in this specification, it contains additionalrequirements which supplement those appearing in Specification B476.5. Ordering Information5.1 Inc
10、lude the following information when placing orders for product under this specification, as applicable:5.1.1 ASTM designation and year of issue,5.1.2 Grade of material (see Table 1),5.1.3 Temper (annealed or work hardened, see Table 2 and Table 3),1 This specification is under the jurisdiction of AS
11、TM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.05 onPrecious Metals and Electrical Contact Materials.Current edition approved Nov. 1, 2012June 1, 2016. Published November 2012June 2016. Originally approved in 1981. Last previous edition approved
12、 in 20082012 asB684 97 (2008).(2012). DOI: 10.1520/B0684-97R12.10.1520/B0684_B0684M-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary
13、 page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends th
14、at users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West
15、Conshohocken, PA 19428-2959. United States15.1.4 Form (rod, wire, sheet, or strip),5.1.5 Dimensions and tolerances,5.1.6 Quantity, total weight or total length or number of pieces of each size,5.1.7 Heat identification or traceability details, if required,5.1.8 Certification and/or Test Report, if r
16、equired.6. Manufacture Materials and Manufacture6.1 Raw materials shall be of such quality and purity that the finished product will have the properties and characteristicsprescribed in this specification.6.2 The material shall be finished by such operations (cold working, annealing, turning, grindi
17、ng, or pickling) as are requiredto produce the prescribed properties.4. General Requirements4.1 The provisions of Specification B476 shall apply to all materials produced to this specification.7. Chemical RequirementsComposition7.1 Material produced under the specification shall meet the requirement
18、s of chemical composition prescribed in Table 1.7.2 By agreement between purchaser and manufacturer, analysis may be required and limits established for elements orcompounds not specified in the table of chemical composition.TABLE 1 Chemical RequirementsElement 85 Pt/15 Ir 90 Pt/10 IrWeight % Weight
19、 %Weight % 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 max eachFe 0.015 max each 0.01
20、5 max eachOther elements 0.02 max each 0.02 max eachTABLE 2 Mechanical Properties of Wire and RodProperty 85 Pt/15 Ir 90 Pt/10 IrAnnealed Work Hardened Annealed Work HardenedUltimate Tensile 75 - 85 90 - 120 35 - 60 70 minimumUltimate Tensile 75 - 85 90 - 120 35 - 60 70 minStrength, ksi (MPa) (520-5
21、90) (620-830) (240-410) (480 minimum)Strength, ksi MPa 520-590 620-830 240-410 480 minElongation, % in 30 minimum 1 - 10 30 minimum 1 - 10Elongation, % in 30 min 1 - 10 30 min 1 min2 in. gage length (51 mm)2 in. gage length 51 mmMicrohardness, HKB684/B684M 162NOTE 1Analysis is regularly made for the
22、 elements for which specific limits are listed. If, however, the presence of “other” elements is suspectedor indicated in the course of routine analysis, further analysis shall be made to determine that the total of these “other” elements and the listed impuritiesis not in excess of the total impuri
23、ties limit.8. Mechanical Property Requirements8.1 The contract or purchase order may specify ultimate tensile strength, elongation, microhardness (Knoop or Vickers),hardness (Rockwell or Rockwell Superficial), or a combination of these mechanical properties as temper criterion. If the contractor ord
24、er does not specify a temper criterion, then the criterion for temper designation will be ultimate tensile strength.8.2 The mechanical properties shall conform to those properties listed in Table 2 and Table 3. The term “work hardened,” asused in these tables, refers to material which has been subje
25、cted to a minimum of 30 % reduction in crosssectional area.8.3 All test specimens shall be full size when practical.8.4 All tests are to be conducted at room temperature, 65 to 85F (1818 to 29C).29C.9. Test Methods9.1 Test methods shall be in accordance with Specification B476.9.1.1 Knoop hardness t
26、ests shall be in accordance with Test Method E384. Material 0.005 in. (0.13 mm)0.13 mm in thickness(diameter) and larger shall be tested using a 100-g indenter load. Material less than 0.005 in. (0.13 mm)0.13 mm in thickness(diameter) shall be tested using a 50-g indenter load. A minimum of five har
27、dness indentations shall be made on each specimen.All indentations shall be made so that the long axis of the indenter is parallel to the rolling or drawing direction of the material.The hardness value reported shall be the average of the five indentations.9.1.2 All tension test specimens shall be f
28、ull cross-section size when practical (see Test Methods E8E8/E8M).9.1.3 All tests shall be conducted in room temperature, 65 to 85F (18.318.3 to 29.4C).29.4C.9.2 Chemical analysis shall be performed by spectrochemical or wet analysis methods.10. Inspection and Testing10.1 Material furnished under th
29、is specification shall be inspected and tested by the manufacturer as listed below:10.1.1 Visual inspection per Specification B476,10.1.2 Tension or hardness tests, or both, for temper verification,10.1.3 Dimensional inspection, and10.1.4 Chemical analysis.11. Keywords11.1 electrical contact materia
30、ls; iridium alloy; medical material; platinum alloy; platinum iridium alloysTABLE 3 Mechanical Properties of Strip and SheetProperty 85 Pt/15 Ir 90 Pt/10 IrAnnealed Work Hardened Annealed Work HardenedUltimate Tensile 75 - 85 90 - 120 35 - 60 70 minimumUltimate Tensile 75 - 85 90 - 120 35 - 60 70 mi
31、nStrength, ksi (MPa) (520-590) (620-830) (240-410) (480 minimum)Strength, ksi MPa 520-590 620-830 240-410 480 minElongation, % in 30 minimum 1 - 10 30 minimum 1 - 10Elongation, % in 30 min 1 - 10 30 min 1 - 102 in. gage length (51 mm)2 in. gage length 51 mmMicrohardness, 130 - 190 200 minimum 130 -
32、190 200 minimumMicrohardness, 130 - 190 200 min 130 - 190 200 minHKB684/B684M 163APPENDIX(Nonmandatory Information)X1. TYPICAL PROPERTY VALUESX1.1 Typical property values of 85 % platinum15 % iridium are as follows:Density, g/cm3 21.6resistivity, .cm at 20C approx. 28solidus temperature, C approx. 1
33、790liquidus temperature, C approx. 1820SUMMARY OF CHANGESCommittee B02 has identified the location of selected changes to this standard since the last issue(B68497(2012) that may impact the use of this standard. (Approved June 1, 2016.)(1) Added Tensile requirements.(2) Created dual designation spec
34、ification (inch-pound/SI).(3) General editorial and form and style revisions.ASTM 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 validi
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