1、Designation: B961 08B961 13Standard Specification forSilver Coated Copper and Copper Alloy StrandedConductors for Electronic Space Application1This standard is issued under the fixed designation B961; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、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 specification covers uninsulated silver-coated soft or annealed copper and copper a
3、lloy stranded conductors for use inelectronic space application.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combi
4、ning values from thetwo systems may result in non-conformance with the standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and det
5、ermine the applicability of regulatorylimitations prior to use. This precautionary caveat pertains only to Section 9.2. Referenced Documents2.1 ASTM Standards:2NOTE 1The following documents of the issue in effect on date of material purchase form a part of this specification to the extent referenced
6、 herein.B193 Test Method for Resistivity of Electrical Conductor MaterialsB258 Specification for Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as ElectricalConductorsB298 Specification for Silver-Coated Soft or Annealed Copper WireB286 Specification for Copper Co
7、nductors for Use in Hookup Wire for Electronic EquipmentB624 Specification for High-Strength, High-Conductivity Copper-Alloy Wire for Electronic ApplicationE3 Guide for Preparation of Metallographic Specimens2.2 European Space Agency (ESA):3ESA/SCC 3901 Generic Specification No. 39012.3 European Coo
8、peration for Space Standardization (ECSS):3ECSS-Q-70-20A Determination of the Susceptibility of Silver Plated Copper wire and Cable to “Red Plague” Corrosion3. Ordering Information3.1 Orders for material under this specification shall include the following information:3.1.1 Quantity of each size.3.1
9、.2 Customer specification requirements including conductor size, designation, and construction.3.1.3 Whether silver-coated copper or silver-coated copper-alloy.3.1.4 Package size (Section 12).3.1.5 Special package marking if required (Section 11), and3.1.6 Place of inspection (Section 10).1 This tes
10、t method specification is under the jurisdiction ofASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.04B01.02on ConductorsMethods of CopperTest and Copper AlloysSampling Procedure.Current edition approved Sept. 1, 2008April 1, 2013. Published October 20
11、08April 2013. Originally approved in 2008. Last previous edition approved in 2008 as B961 08. DOI: 10.1520/B0961-08.10.1520/B0961-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume inform
12、ation, refer to the standards Document Summary page on the ASTM website.3 ESA Publications Division, ESTEC, P.O. Box 299, 2200 AG Noordwijk, The Netherlands (ESA/SCC 3901 download available from www.escies.org).This document is not an ASTM standard and is intended only to provide the user of an ASTM
13、 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 versionof the standard as published b
14、y ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14. Coating of Wires4.1 Coating ThicknessThe silver coating of wires composing stranded conductors shall be uniform such that no area arou
15、ndthe strand circumference is covered by less than 80 micro-inches of silver. Uniform silver coating shall be verified bymicro-sectioning as outlined in section 9.1.4.1.1 Single points caused by eccentric strands or minute scratches shall not be less than 60 micro-inches minimum or exceed3 points in
16、 number around the micro-sectioned strand circumference.4.2 The silver coating of wires composing stranded conductors (before and after stranding) shall conform to the polysulfide testin accordance with Specification B298.4.3 The average silver coating thickness of wires composing stranded conductor
17、s shall be verified by electronic determination(Method A) in accordance with Specification B298.4.4 Red Plague Corrosion TestRepresentative samples of the silver coated conductors shall conform to codes 0 3 of theaccelerated corrosion test for un-insulated silver-plated conductors as outlined in sec
18、tion 9.2 (Explanatory Note 1).5. General Requirements5.1 TemperUnless otherwise specified, all coated conductors shall be furnished in the annealed temper.5.2 ElongationThe elongation of stranded conductors shall be permitted to vary from the requirements of the applicableSpecifications B298 and B62
19、4 by the following amounts:5.2.1 For stranded silver coated copper conductors 22 AWG and smaller, the test shall be performed on the whole conductorand the elongation measured when the first strand of the conductor breaks. The minimum average elongation shall not be less than10 % with no individual
20、specimen less than 5 %.5.2.2 For stranded silver coated copper conductors larger than 22 AWG, strands shall be carefully removed from the conductorand tested for elongation. The minimum average elongation shall not be less than 10 % with no individual strand less than 5 %.5.2.3 For stranded silver c
21、oated copper alloy conductors, the test shall be performed on the whole conductor only and theelongation measured when the first strand of the conductor breaks. The minimum elongation shall not be less than 6 %.6. Lay of Stranded Conductors6.1 The direction of lay of the outside layer of stranded co
22、nductors shall be left-hand.6.2 The direction of lay of the other layers shall be reversed in successive layers, unless otherwise agreed upon between themanufacturer and the purchaser.6.3 The length of lay of the individual wires composing the outside layer of the stranded conductor shall not be les
23、s than 8 normore than 16 times the outside diameter of that layer.7. Joints7.1 No joints shall be made at the final draw prior to stranding. No joints shall be made in the individual strands or in thecompleted conductor during the stranding process. Necessary joints made in the wire and rods prior t
24、o final drawing shall be inaccordance with the best workmanship practice.8. Physical and Electrical Test8.1 Tests to determine conformance of the coating to the requirements prescribed in Section 4 shall be performed beforeinsulating.8.2 Tests to determine conformance to the elongation requirements
25、prescribed in section 5.2 shall be made before insulating.8.3 Tests to determine conformance to electrical resistance requirements prescribed in 3.1.2 shall be made on the uninsulatedconductor in accordance with Test Method B193.9. Test Methods9.1 Micro-Sectioning of Strands:9.1.1 The silver coating
26、 shall be evaluated for uniform coating requirements using the following procedure for micro-sectioningof strands. Section 9.1 shall be performed according to best commercial metallographic practice. Guide E3 would provide a goodbackground reference for metallographic examination and preparation of
27、samples.9.1.2 The test specimen shall consist of untwisted strands from the completed conductor. The test specimen shall beelectroplated with a copper or nickel coating, which is not less than 25 m. The copper or nickel coating will provide protectionof the specimen edges for follow-up grinding and
28、polishing preparation.9.1.2.1 Unless otherwise agreed upon between the manufacturer and purchaser, the manufacturer may have the option toperform the micro-sectioning without the copper or nickel over-coating. The over-coating could be used at the discretion of themetallographer to referee suspect r
29、esults.B961 1329.1.3 Mount the test specimen in a low exotherm (heat) casting resin encapsulating the specimen for metallographic preparationand cross-sectioning.9.1.4 The specimen should be ground and polished using appropriate grinding disk pads and diamond paste. The diamond pasteshould go down t
30、o at least 0.25 m.9.1.5 Etch the polished specimen in a new solution of ammonia (commercially pure), which contains two drops of 37 %hydrogen peroxide.9.1.6 Use a metallographic microscope to examine the etched cross-section with at least 400 magnification.The specimen shallmeet the requirements of
31、section 4.1.9.2 Red Plague Corrosion Test:9.2.1 Apparatus: (See Appendix X1 and Fig. 2).9.2.2 Preparation of Sample:9.2.2.1 The conductor to be used in test shall be taken from the test spool with a minimum of handling. Handling of theconductor must be done using powder free gloves.9.2.2.2 The test
32、samples shall be 8 to 16 in. in length and attached to the polyethylene rod.9.2.2.3 The rod sample shall then be encapsulated in the heat shrinkable polyethylene tubing with one end having 20 +/6 5mm of conductor exposed. (Fig. 1).9.2.3 Preparation of Test Equipment:9.2.3.1 Temperature controlled ba
33、th shall be filled with de-ionized water and allowed sufficient time for bath to reach testingtemperature. (58C +/6 2C).9.2.3.2 Fill glass flask with 200 ml of de-ionized water and place in temperature controlled bath to allow it to reach anequilibrium temperature.9.2.3.3 The test sample shall be in
34、serted in a hole in the rubber stopper. Insert copper wire between glass flask and rubberstopper to allow for air gap.9.2.3.4 The glass tube shall be inserted into the rubber stopper and the rubber stopper then fitted into the glass flask.9.2.3.5 Adjust glass tube height until it is immersed in the
35、de-ionized water.Adjust sample height until it is 20 +/65 mm abovethe height of the de-ionized water in the flask (Fig. 2).9.2.3.6 Adjust oxygen (industrial oxygen with 99.2 % or greater purity) supply to a flow rate of 50 +/6 10 bubbles per min.9.2.3.7 Water level evaporation in the temperature con
36、trolled bath should be prevented by a covering of any suitable material,e.g., Hollow Ball Bath Covers.9.2.4 Test:9.2.4.1 Test sample shall be exposed to controlled environment for 240 h.9.2.4.2 After 240 h, the sample shall be removed from controlled environment.9.2.5 Evaluation:9.2.5.1 Remove the c
37、lear polyethylene jacket immediately using an appropriate cutting tool that does not damage the conductor.9.2.5.2 The test sample shall be evaluated within 3 h after removal from controlled environment.9.2.5.3 Inspect the sample using 20 magnification for corrosion sites. The corrosion site will app
38、ear as red/black cuprous oxideshowing evidence of galvanic corrosion.9.2.5.4 The following criteria shall be used for the evaluation of the results for 7-strand conductors:CODE 0 NONE, no corrosion points.CODE 1 ONE POINT, on one or two adjacent strands in one location along the length of the sample
39、.CODE 2 SLIGHT, on two to three adjacent strands in one location along the length of the sample.CODE 3 MODERATE, on two to three strands in two to three locations along the length of the sample.CODE 4 MODERATE, on more than four adjacent strands in four or more locations along length of the sample.C
40、ODE 5 SEVERE CORROSION, affecting more than 50 % of the total strands from the conductor in any one location.FIG. 1 Prepared Test SampleB961 1339.2.5.5 The following criteria shall be used for the evaluation of the results for 19-strand conductors:CODE 0 NONE, no corrosion points.CODE 1 ONE POINT, o
41、n one or two adjacent strands in one location along the length of the sample.CODE 2 SLIGHT, on two to eight adjacent strands in one location along the length of the sample.CODE 3 MODERATE, on two to eight strands in two to three locations along the length of the sample.CODE 4 MODERATE, on two to ten
42、 strands in four or more locations along the length of the sample.CODE 5 SEVERE CORROSION, affecting more than 50 % of the total strands from the conductor in any one location.9.2.5.6 Codes 0-3 would not be expected to affect the electrical properties of the conductor. Codes 4 and 5 are grounds forr
43、ejection. Refer to Appendix X2 for illustrations of corrosion criteria codes (Explanatory Note 2).10. Inspection10.1 All test and inspection shall be made at the place of manufacture. The manufacturer shall afford the inspector representingthe purchaser all reasonable facilities, without charge, to
44、satisfy him that the material is being furnished in accordance with thisspecification.10.1.1 Unless otherwise agreed upon by the manufacturer and the purchaser, conformance of the wire to the variousrequirements of this specification shall be determined on samples taken from each lot of wire present
45、ed for acceptance.10.2 Terms Applying to Inspection:10.2.1 LotA lot is any amount of wire of one type and size presented for acceptance at one time.10.2.2 SampleA sample is a quantity of production units (coils, reels, etc.) selected at random from the lot for the purposeof determining conformance o
46、f the lot to the requirements of this specification.10.2.3 SpecimenAspecimen is a length of wire removed for test purposes from any individual production unit of the sample.10.2.4 Sample SizeThe number of production units in a sample shall be as follows:10.2.4.1 A full (100 % inspection) will be com
47、pleted at every set-up prior to manufacturing the order.10.2.4.2 For the polysulfide test (see 4.2coating ) and silver coating thickness (see 4.3) covered under coating of wirerequirements listed in Section 4, the sampling shall consist of each production unit from the lot. From each unit, one test
48、specimenof sufficient length shall be removed for performing the test.(a) For micro-sectioning (see 4.1) and red plague corrosion test (see 4.4) covered under coating of wire requirements in Section4, the sampling shall consist of the first and last production units from the lot.10.2.4.3 For elongat
49、ion, dimensional measurements, and physical measurements, the sampling shall consist of sequentialproduction units from the lot.FIG. 2 Diagram of Test Equipment for Red Plague Corrosion TestB961 13411. Product Marking11.1 The net mass, size designation, type of conductor, purchase order number, and any other marks required by the purchaseorder shall be attached to the conductor package.12. Packaging and Package Marking12.1 Package sizes for conductors shall be agreed upon by the manufacturer and the purchaser in the placing of individualorders.12.2 The cond
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