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ASTM B684-97(2008)

(Specification)

Standard Specification for Platinum-Iridium Electrical Contact Materials

Standard Specification for Platinum-Iridium Electrical Contact Materials

ABSTRACT
This specification covers two platinum-iridium alloys in the form of rod, wire, strip, and sheet material for electrical contacts. Raw materials shall be of such quality and purity that the finished product (produced by cold working, annealing, turning, grinding, or pickling as required) will have the properties and characteristics prescribed in this specification. The alloys shall meet the requirements of chemical composition specified for platinum, iridium, total impurities, total platinum group (palladium, rhodium, osmium, ruthenium, and gold), total other impurities (including lead, antimony, bismuth, tin, arsenic, cadmium, zinc, and iron) and other elements. Ultimate tensile strength, elongation, microhardness (Knoop or Vickers), hardness (Rockwell or Rockwell Superficial), or a combination of these mechanical properties may be specified as criterion for temper designation. Annealed and work hardened wire and strip shall conform to the mechanical requirements prescribed for ultimate tensile strength, elongation, and microhardness. Knoop hardness test, tension test, and chemical analysis using spectrochemical or wet analysis method shall be performed.
SCOPE
1.1 This specification covers an 85 % platinum—15 % iridium alloy, and a 90 % platinum—10 % iridium alloy, in the form of rod, wire, strip, and sheet material for electrical contacts.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 The original specification, B 684 - 81, covered the 85 % platinum 15 % iridium alloy. The 1997 revision of this specification added the 90 % platinum 10 % iridium alloy.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Apr-2008
ICS
77.120.99 - Other non-ferrous metals and their alloys
Technical Committee
B02 - Nonferrous Metals and Alloys
Drafting Committee
B02.05 - Precious Metals and Electrical Contact Materials and Test Methods
Current Stage
Ref Project

Relations

Replaces
ASTM B684-97(2002) - Standard Specification for Platinum-Iridium Electrical Contact Materials
Effective Date
01-May-2008
Replaced By
ASTM B684-97(2012) - Standard Specification for Platinum-Iridium Electrical Contact Materials
Effective Date
01-Nov-2012

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ASTM B684-97(2008) - Standard Specification for Platinum-Iridium Electrical Contact Materials
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:B684 −97(Reapproved2008)
Standard Specification for
Platinum-Iridium Electrical Contact Materials
This standard is issued under the fixed designation B684; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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. Scope B277 Test Method for Hardness of Electrical Contact Mate-
rials
1.1 This specification covers an 85 % platinum—15 %
B476 Specification for General Requirements for Wrought
iridium alloy, and a 90 % platinum—10 % iridium alloy, in the
Precious Metal Electrical Contact Materials
form of rod, wire, strip, and sheet material for electrical
E8 Test Methods for Tension Testing of Metallic Materials
contacts.
E384 Test Method for Knoop and Vickers Hardness of
1.2 The values stated in inch-pound units are to be regarded
Materials
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
3. Manufacture
and are not considered standard.
3.1 Raw materials shall be of such quality and purity that
1.3 The original specification, B684 - 81, covered the 85 %
the finished product will have the properties and characteristics
platinum 15 % iridium alloy. The 1997 revision of this speci-
prescribed in this specification.
fication added the 90 % platinum 10 % iridium alloy.
3.2 The material shall be finished by such operations (cold
1.4 This standard does not purport to address all of the
working, annealing, turning, grinding, or pickling) as are
safety concerns, if any, associated with its use. It is the
required to produce the prescribed properties.
responsibility of the user of this standard to become familiar
with all hazards including those identified in the appropriate
4. General Requirements
Material Safety Data Sheet (MSDS) for this product/material
as provided by the manufacturer, to establish appropriate
4.1 The provisions of Specification B476 shall apply to all
safety and health practices, and determine the applicability of
materials produced to this specification.
regulatory limitations prior to use.
5. Chemical Requirements
2. Referenced Documents
5.1 Material produced under the specification shall meet the
2.1 ASTM Standards:
requirements of chemical composition prescribed in Table 1.
This specification is under the jurisdiction of ASTM Committee B02 on
5.2 By agreement between purchaser and manufacturer,
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
analysis may be required and limits established for elements or
B02.05 on Precious Metals and Electrical Contact Materials.
compounds not specified in the table of chemical composition.
Current edition approved May 1, 2008. Published June 2008. Originally
approved in 1981. Last previous edition approved in 2002 as B684 – 97 (2002).
NOTE 1—Analysis is regularly made for the elements for which specific
DOI: 10.1520/B0684-97R08.
limitsarelisted.If,however,thepresenceof“other”elementsissuspected
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
or indicated in the course of routine analysis, further analysis shall be
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
made to determine that the total of these “other” elements and the listed
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. impurities is not in excess of the total impurities limit.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959. United States
B684−97(2008)
TABLE 1 Chemical Requirements
7.1.1 Knoop hardness tests shall be in accordance with Test
Element 85 Pt/15 Ir 90 Pt/10 Ir Method E384. Material 0.005 in. (0.13 mm) in thickness
Weight % Weight % (diameter) and larger shall be tested using a 100-g indenter
Pt balance balance
load. Material less than 0.005 in. (0.13 mm) in thickness
Ir 14.50-15.50 9.50-10.50
(diameter) shall be tested using a 50-g indenter load. A
Total Impurities 0.2 max. 0.2 max.
Total Platinum Group (Pd, Rh, Os, Ru),Au 0.1 max. 0.1 max. minimum of five har
...

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SCOPE
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