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ASTM B664-90(2012)

(Specification)

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

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

ABSTRACT
This specification defines the criteria for composition and other requirements for sliding contact materials or brushes with a nominal composition by weight of 20% silver and 80% graphite. Materials shall adhere to specified requirements for chemical composition, density, shear strength, and microstructure. They shall also conform to typical values of Rockwell superficial hardness and specific resistance.
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 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.
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 will 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-2012
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 B664-90(2006) - Standard Specification for 80 % Silver-20 % Graphite Sliding Contact Material
Effective Date
01-May-2012

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ASTM B664-90(2012) - Standard Specification for 80 % Silver-20 % Graphite Sliding Contact MaterialASTM B664-90(2012) - Standard Specification for 80 % Silver-20 % Graphite Sliding Contact Material
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ASTM B664-90(2012) - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:B664 −90(Reapproved 2012)
Standard Specification for
80% Silver-20% Graphite Sliding Contact Material
This standard is issued under the fixed designation B664; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Physical Properties—The following lot average proper-
ties must be met. Unless otherwise agreed between the pro-
1.1 This specification defines the criteria for composition
ducer and the user, the number of samples shall be five.
and other requirements for brushes with a nominal silver
3.2.1 Density—The minimum acceptable density shall be
content of 80%, by weight, with the balance being substan-
5.15 g/cm as determined by the measurement and weight
tially graphite.
method defined by ANSI C64.1.
1.2 The values stated in inch-pound units are to be regarded
3.2.2 Shear Strength:
asstandard.Nootherunitsofmeasurementareincludedinthis
3.2.2.1 The shear strength for the normal and transverse
standard.
directions shall be measured for rectangular parallelepipeds
1.3 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 become familiar tion shall be measured for cylinders and shall be 1000 psi (6.9
will all hazards including those identified in the appropriate
MPa), minimum.
Material Safety Data Sheet (MSDS) for this product/material
3.3 Microstructure—Partsshallbevisuallyfreeofstructural
as provided by the manufacturer, to establish appropriate
defects, cracks, etc., upon examination at 50×. The press
safety and health practices, and determine the applicability of
direction, as evidenced by laminations, shall be as defined by
regulatory limitations prior to use.
the purchase order. Also the brush material shall not contain
abrasive particles that will sliver a metal alloy ring with a
2. Referenced Documents
hardness≥110 HK when the brush force is equal to 30 g or
2 100
2.1 ASTM Standards:
that necessary for 5.0 psi (34 kPa) pressure, whichever is
B613 Guide for Preparing Specifications for Miniature
greater. A sliver is defined as a loose wear particle with one
Brushes of Composite Materials for Sliding Electric
dimension ≥50× the next smaller dimension. Although sliver-
Contacts
ing can be caused by coarse abrasive particles, other param-
E18Test Methods for Rockwell Hardness of Metallic Ma-
eters can contribute to slivering (for example, very high brush
terials
force).
2.2 ANSI Standard:
3.4 Sourceorgradeofrawmaterials(forexample,graphite)
C64.1Brushes for Electrical Machines
or methods of manufacture shall not be changed without
3. Requirements
notifying users.
3.1 Chemical Composition, shall be as follows:
4. Reference Properties
Silver 80 ± 3
...

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1.1 This specification covers electrical contact components made from silver nickel by powder metallurgical procedures.  
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