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ASTM B692-90(2006)

(Specification)

Standard Specification for 75 % Silver-25 % Graphite Sliding Contact Material

Standard Specification for 75 % Silver-25 % Graphite Sliding Contact Material

ABSTRACT
This specification defines the criteria for the chemical composition and other requirements (including physical properties, microstructure, superficial hardness, and specific resistance ) for silver-graphite brushes for sliding electrical contacts. The percentage of silver, graphite, ash in graphite, and total metal impurities are prescribed. The minimum acceptable values for the physical properties such as density, determined by measurement and weight method, and shear strength are given. Typical Rockwell hardness and specific resistance for the material are also specified.
SCOPE
1.1 This specification defines the criteria for composition and other requirements for brushes with a nominal silver content of 75 weight % with the balance being substantially graphite.
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
31-May-2006
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 B692-90(2000) - Standard Specification for 75% Silver-25% Graphite Sliding Contact Material
Effective Date
01-Jun-2006
Replaced By
ASTM B692-90(2012) - Standard Specification for 75 % Silver-25 % % Graphite Sliding Contact Material
Effective Date
01-May-2012

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ASTM B692-90(2006) - Standard Specification for 75 % Silver-25 % Graphite Sliding Contact MaterialASTM B692-90(2006) - Standard Specification for 75 % Silver-25 % Graphite Sliding Contact Material
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ASTM B692-90(2006) - Standard Specification for 75 % Silver-25 % 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: B692 – 90 (Reapproved 2006)
Standard Specification for
75 % Silver-25 % Graphite Sliding Contact Material
This standard is issued under the fixed designation B692; 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 3.2.1 Density—The minimum acceptable density shall be
4.6 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 75 weight% with the balance being substantially
3.2.2.1 The shear strength for the normal and transverse
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 become familiar
tion shall be measured for cylinders and shall be 1000 psi (6.9
with 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 503. 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
2. Referenced Documents
abrasive particles that will sliver a metal-alloy ring with a
hardness$110 HK whenthebrushforceisequalto30gor
10 0
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 Con-
dimension$503 the next smaller dimension. Although sliv-
tacts
ering can be caused by coarse abrasive particles, other param-
E18 Test 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 Source or Grade of Raw Materials (forexample,graph-
C64.1 Brushes for Electrical Machines
ite) 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 75 6 3 % (weight)
4.1 Because of their size, the following properties can not
Graphite balance
Total metal impurities 1 % max
always be determined. However, these properties are typical
P
...

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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.  
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