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ASTM

ASTM B664-90(2000)

(Specification)

Standard Specification for 80% Silver-20% Graphite Sliding Contact Material

Standard Specification for 80% Silver-20% Graphite Sliding Contact Material

SCOPE
1.1 This specification defines the criteria for composition and other requirements for brushes with a nominal silver content of 80%, by weight, with the balance being substantially graphite.  
1.2 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 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.  
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
31-Dec-1999
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 B664-90(2006) - Standard Specification for 80 % Silver-20 % Graphite Sliding Contact Material
Effective Date
01-Jun-2006

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ASTM B664-90(2000) - Standard Specification for 80% Silver-20% Graphite Sliding Contact MaterialASTM B664-90(2000) - Standard Specification for 80% Silver-20% Graphite Sliding Contact Material
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ASTM B664-90(2000) - Standard Specification for 80% Silver-20% Graphite Sliding 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 664 – 90 (Reapproved 2000)
Standard Specification for
80 % Silver-20 % Graphite Sliding Contact Material
This standard is issued under the fixed designation B 664; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2.1 Density—The minimum acceptable density shall be
5.15 g/cm as determined by the measurement and weight
1.1 This specification defines the criteria for composition
method defined by ANSI C64.1.
and other requirements for brushes with a nominal silver
3.2.2 Shear Strength:
content of 80%, by weight, with the balance being substan-
3.2.2.1 The shear strength for the normal and transverse
tially graphite.
directions shall be measured for rectangular parallelepipeds
1.2 This standard does not purport to address all of the
and shall be 2000 psi (14 MPa), minimum.
safety concerns, if any, associated with its use. It is the
3.2.2.2 The shear strength for the longitudinal shear direc-
responsibility of the user of this standard to establish appro-
tion shall be measured for cylinders and shall be 1000 psi (6.9
priate safety and health practices and determine the applica-
MPa), minimum.
bility of regulatory limitations prior to use.
3.3 Microstructure—Partsshallbevisuallyfreeofstructural
1.3 It is the responsibility of the user to become familiar
defects, cracks, etc., upon examination at 503. The press
with all hazards including those identified in the appropriate
direction, as evidenced by laminations, shall be as defined by
Material Safety Data Sheet for this product/material as pro-
the purchase order. Also the brush material shall not contain
vided by the manufacturer.
abrasive particles that will sliver a metal alloy ring with a
2. Referenced Documents hardness$110 HK whenthebrushforceisequalto30gor
10 0
that necessary for 5.0 psi (34 kPa) pressure, whichever is
2.1 ASTM Standards:
greater. A sliver is defined as a loose wear particle with one
B613 Guide for Preparing Specifications for Miniature
dimension$503 the next smaller dimension. Although sliv-
Brushes of Composite Materials for Sliding Electric Con-
ering can be caused by coarse abrasive particles, other param-
tacts
eters can contribute to slivering (for example, very high brush
E18 Test Methods for Rockwell Hardness and Rockwell
force).
Superficial Hardness of Metallic Materials
3.4 Sourceorgradeofrawmaterials(forexample,graphite)
2.2 ANSI Standard:
or methods of manufacture shall not be changed without
C64.1 Brushes for Electrical Machines
notifying users.
3. Requirements
4. Reference Properties
3.1 Chemical Composition, shall be as follows:
4.1 Because of their size, the
...

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9.1 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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