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ASTM B662-94(2000)

(Specification)

Standard Specification for Silver-Molybdenum Electrical Contact Material

Standard Specification for Silver-Molybdenum Electrical Contact Material

SCOPE
1.1 This specification covers electrical contact components made from silver-molybdenum by powder metallurgical procedures.
1.2 This specification covers compositions within the silver-molybdenum system normally specified by users of contacts.
1.3 It is the responsibility of the user to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet for this product/material as provided by the manufacturer.

General Information

Status
Historical
Publication Date
09-May-2000
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

Replaced By
ASTM B662-94(2006) - Standard Specification for Silver-Molybdenum Electrical Contact Material
Effective Date
01-Jun-2006

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ASTM B662-94(2000) - Standard Specification for Silver-Molybdenum Electrical Contact MaterialASTM B662-94(2000) - Standard Specification for Silver-Molybdenum Electrical Contact Material
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ASTM B662-94(2000) - Standard Specification for Silver-Molybdenum Electrical Contact Material
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B 662 – 94 (Reapproved 2000)
Standard Specification for
Silver-Molybdenum Electrical Contact Material
This standard is issued under the fixed designation B 662; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope of the Annual Book of ASTM Standards or by any other
approved method agreed upon between the manufacturer and
1.1 This specification covers electrical contact components
the purchaser.
made from silver-molybdenum by powder metallurgical pro-
cedures.
5. Physical Properties
1.2 This specification covers compositions within the silver-
5.1 The manufacturer and the purchaser shall agree on
molybdenum system normally specified by users of contacts.
qualification tests for determination of physical properties.
1.3 It is the responsibility of the user to become familiar
5.2 The tests shall be performed on production parts,
with all hazards including those identified in the appropriate
wherever practical or applicable. (Small size contacts do not
Material Safety Data Sheet for this product/material as pro-
lend themselves to accurate conductivity measurement.)
vided by the manufacturer.
5.3 The tests shall be determined after consideration of the
2. Referenced Documents function of the part.
5.4 The typical properties of two most common types of
2.1 ASTM Standards:
silver-molybdenum contacts are given in the appendix.
B 328 Test Method for Density, Oil Content, and Intercon-
nected Porosity of Sintered Metal Structural Parts and
6. Finishing of Contacts
Oil-Impregnated Bearings
6.1 The material shall be finished by such operations as
3. Ordering Information necessary to meet requirements agreed upon between the
manufacturer and the purchaser of the contacts (braze alloy
3.1 Orders for this material under this specification shall
backing, tumbling to polish surfaces, special surface finish,
include the following information:
silver-rich surface layer, cleaning, etc.).
3.1.1 Dimensions (see Section 10),
3.1.2 Chemical composition (see tables in the appendix as a
7. Dimensions, Mass and Permissible Variations
guideline),
7.1 Permissible variations in dimensions shall be within the
3.1.3 Physical properties (see Section 5 and the appendix as
limits specified on drawings describing the contacts and
a guideline),
accompanying the order; or shall be within the limits specified
3.1.4 Certification (see Section 13), and
in the purchase order.
3.1.5 Other features as agreed upon between the manufac-
turer and purchaser.
8. Workmanship, Finish, and Appearance
4. Chemical Composition 8.1 The parts shall be free of defects in material or process-
ing that would seriously affect their performance.
4.1 The material shall conform to composition limits as
agreed upon between the manufacturer and the purchaser.
9. Significance and Use
4.2 The chemical analysis shall be made in accordance with
9.1 Proprietary methods for the manufacture of these mate-
the methods prescribed in the newest edition of Volume 01.02
rials 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
This test method is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
contact itself (opening speed, closing speed, contact pressure,
B2.05 on Precious Metals.
contact bounce, environmental variations, assembly technique
Current edition approved April 15, 1994. Published June 1994. Originally
and variations, etc.), this specification cannot ensure perfor-
published as B 662 – 79. Last previous edition B 662 – 89.
Annual Book of ASTM Standards, Vol 02.05. mance control in the application.As part of the qualification on
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 662 – 94 (2000)
initial samples, it is recommended that the user functionally agreement between manufacturer and purchaser for both limits
and electrically test the materials for all devices applicable to and methods of analysis should be required for elements not
the material’s use. This specification will provide a means for specified.
the contact manufacturer and contact user to reach agreement 10.3 Physical Tests—The manufacturer and the purchaser
on the details of the material to be supplied for a specific use, shall agree on a representative number of specimens for
and reasonable assurance that future lots will be similar in physical tests including microstructure.
properties and microstructure to the initial test or sample
11. Inspection
contacts supplied.
11.1 Unlessotherwisespecified,inspectionofpartssupplied
10. Sampling
on contract shall be made by the purchaser.
10.1 Lot—Unless otherwise specified, a lot shall consist of
12. Rejection
partsofthesameformanddimensions,madeofpowdersofthe
same particle size range and composition, processed under the 12.1 Unless otherwise specified, rejections based on tests
same conditions, and submitted for inspection at one time. made in accordance with the specification shall be reported to
10.2 Chemical Analysis:
the manufacturer within 30 days of the receipt of shipment.
10.2.1 At least one sample for chemical analysis shall be
13. Certification
taken from each lot. A representative sample of chips may be
obtained by milling, drilling, or crushing at least two pieces 13.1 A certificatio
...

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