1、Designation: B613 76 (Reapproved 2012)B613 17Standard Guide forPreparing Specifications for Miniature Brushes ofComposite Materials for Sliding Electric Contacts1This standard is issued under the fixed designation B613; the number immediately following the designation indicates the year oforiginal a
2、doption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This guide defines the criteria for composition, properties, and othe
3、r requirements for brushes containing a matrix of oneor more conducting metallic elements or alloys and one or more lubricating lamellar solids.1.2 The resulting specification is intended for use where the size (for example, 5 by 3 by 2 mm), shape, or other factors precludethe determination of prope
4、rties on specimens of the bulk material from which individual brushes are made.1.3 The requirements recommended herein have been found to be desirable for most brush material composites. Care must betaken in preparing a specification for a pre-existing material that imposition of one or more provisi
5、ons herein does not alter thematerial or its performance.1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the
6、responsibilityof the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety DataSheet (MSDS)(SDS) for this product/material as provided by the manufacturer, to establish appropriate safety safety, health, andhealthenvironmental practic
7、es, and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Rec
8、ommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2E18 Test Methods for Rockwell Hardness of Metallic MaterialsE384 Test Method for Microindentation Hardness of Materials2.2 ANSINEMA Standard:C64.1CB-1 Brushes for
9、 Electrical Machines 33. Requirements3.1 CompositionEach constituent should be listed individually by weight percent including tolerances if mutually agreed uponby producer and user. Any analytical technique may be used as agreed upon between the producer and user.3.2 DensityAn apparent density for
10、the material should be defined. The measurement and weight method defined by ANSIC64.1NEMA CB-1 is preferred.3.3 ResistivityThe resistivity should be defined for at least one axis. The procedure defined by ANSI C64.1NEMA CB-1 mayneed to be modified, as agreed upon between the producer and user, for
11、very small brushes.3.4 HardnessThe bulk hardness of the brush material should be defined. Rockwell superficial hardness tests, 18 or 14 in.-ball,(Test Methods E18) and Knoop, 500-g load (Test Method E384) have been used.1 This guide is under the jurisdiction of ASTM Committee B02 on Nonferrous Metal
12、s and Alloys and is the direct responsibility of Subcommittee B02.05 on PreciousMetals and Electrical Contact Materials.Current edition approved May 1, 2012Nov. 1, 2017. Published May 2012November 2017. Originally approved in 1976. Last previous edition approved in 20062012 asB613 76 (2006).(2012).
13、DOI: 10.1520/B0613-76R12.10.1520/B0613-17.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standardsstandards Document Summary page on the ASTM website.3 Availabl
14、e from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.National Electrical ManufacturersAssociation (NEMA), 1300 N. 17th St., Suite 1752, Rosslyn, VA 22209, http:/www.nema.org.This document is not an ASTM standard and is intended only t
15、o provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versiono
16、f the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.5 StrengthThe strength of the brush material should be defined. Transverse strength (ANSI C64.1)(NEMA CB-1
17、) may beused when the brushes are sufficiently large. Small brushes (for example, 5 by 3 by 2 mm) will require that other test proceduresbe used (for example, shear strength).3.6 MicrostructureAll should be visually free of structural defects, cracks, etc., upon examination at 50. The pressingdirect
18、ion, as evidenced by laminations, should be as defined by the purchase order.4. Keywords4.1 brushes; composite materials; electrical contacts; sliding contactsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this stand
19、ard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be review
20、ed every five years andif not revised, either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible
21、technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Consh
22、ohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 172
