ASTM B693-91(2012)
(Specification)Standard Specification for Silver-Nickel Electrical Contact Materials
Standard Specification for Silver-Nickel Electrical Contact Materials
ABSTRACT
This specification covers electrical contact components made from silver-nickel by powder metallurgical procedures. This covers compositions within the silver-nickel system normally specified by users of electrical contacts. Chemical analysis shall be performed to evaluate material conformance to specified composition requirements. A representative sample of chips may be obtained by milling, drilling, or crushing with dry tools, (without lubrication). In order to obtain free chips, the parts selected for testing shall have the oil extracted, if necessary. Physical tests including microstructure shall be performed on a representative number of specimens.
SIGNIFICANCE AND USE
Proprietary methods for manufacture of these materials vary significantly among suppliers and these methods influence such properties as arc erosion, contact resistance, and the tendency to weld in service. Since the performance of contacts in a device depends on numerous factors outside the contact itself (opening speed, closing speed, contact pressure, contact bounce, environmental variations, assembly technique and variations, etc.), this specification cannot ensure performance control in the application. As part of the qualification on initial samples, it is recommended that the user functionally test the materials electrically for all devices applicable to the material's use. This specification provides a means for the contact manufacturer and contact user to reach agreement on the details of material to be supplied for a specific use and reasonable assurance that future lots will be similar in properties and microstructure to the initial test or sample contact supplied.
SCOPE
1.1 This specification covers electrical contact components made from silver nickel by powder metallurgical procedures.
1.2 This specification covers compositions within the silver-nickel system normally specified by users of electrical contacts.
1.3 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
Relations
Standards Content (Sample)
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:B693 −91 (Reapproved 2012)
Standard Specification for
Silver-Nickel Electrical Contact Materials
This standard is issued under the fixed designation B693; 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.
1. Scope 3.1.1 Dimensions (see Section 6).
3.1.2 Chemical composition (see reference table in Appen-
1.1 This specification covers electrical contact components
dix X1).
made from silver nickel by powder metallurgical procedures.
3.1.3 Physical properties (see Section 5 and reference table
1.2 This specification covers compositions within the silver-
in Appendix X1).
nickel system normally specified by users of electrical con-
3.1.4 Certification (see Section 13).
tacts.
3.1.5 Other features as agreed upon between the seller and
the user.
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4. Chemical Composition
standard.
4.1 The material shall conform to composition limits as
1.4 This standard does not purport to address all of the
agreed upon between the manufacturer and user.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to become familiar
4.2 The chemical analysis shall be made in accordance with
with all hazards including those identified in the appropriate the methods described in the newest edition of Annual Book of
Material Safety Data Sheet (MSDS) for this product/material
ASTM Standards, Vol 03.05 and 03.06, or by any other
as provided by the manufacturer, to establish appropriate approved method agreed upon between manufacturer and
safety and health practices, and determine the applicability of
purchaser.
regulatory limitations prior to use.
5. Physical Requirements
2. Referenced Documents
5.1 The manufacturer and purchaser shall agree on qualifi-
cation tests for determination of physical properties.
2.1 ASTM Standards:
B328 Test Method for Density, Oil Content, and Intercon-
5.2 The tests shall be performed on production parts,
nected Porosity of Sintered Metal Structural Parts and
wherever practical, or applicable. (Small size contacts do not
Oil-Impregnated Bearings (Withdrawn 2009)
lend themselves to accurate conductivity measurement.)
E18 Test Methods for Rockwell Hardness of Metallic Ma-
5.3 The tests shall be determined after consideration of the
terials
function of the part.
E384 Test Method for Knoop and Vickers Hardness of
5.4 The typical properties of the most common types of
Materials
silver-nickel electrical contact materials are given in the
appendix.
3. Ordering Information
3.1 Orders for this material under this specification shall
6. Dimensions, Mass, and Permissible Variations
include the following information.
6.1 Permissible variations in dimensions shall be within the
limits specified on drawings describing the contacts and
accompanying the order, or shall be within the limits specified
This specification is under the jurisdiction of ASTM Committee B02 on
in the purchase order.
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.05 on Precious Metals and Electrical Contact Materials.
Current edition approved May 1, 2012. Published May 2012. Originally 7. Workmanship, Finish, and Appearance
approved in 1981. Last previous edition approved in 2006 as B693 – 91 (2006).
7.1 The parts shall be free of defects in material or
DOI: 10.1520/B0693-91R12.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or processing, which would seriously affect their performance.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on 8. Sampling
the ASTM website.
8.1 Lot—Unless otherwise specified, a lot shall consist of
The last approved version of this historical standard is referenced on
www.astm.org. parts of the same form, and dimensions, made of powders of
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B693−91 (2012)
the same particle size range and composition, processed under manufacturer and contact user to reach agreement on the
the same conditions, and submitted for inspection at one time. details of material to be supplied for a specific use and
reasonable assurance that future lots will be similar in proper-
9. Number of Tests and Retests ties and microstructure to the initial test or sample contact
supplied.
9.1 Chemical Analysis—The manufacturer and purchaser
shall agree on a representative number of specimens for
11. Inspection
chemical analysis. A representative sample of chips may be
11.1 Inspection of the material shall be agreed upon be-
obtained by milling, drilling, or crushing with dry tools,
tween the purchaser and the supplier as part of the purchase
(without lubrication). In order to obtain free chips, the parts
contract.
selected for test shall have the
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.