1、Designation:C75009(Reapproved 2014)Standard Specification forNuclear-Grade Boron Carbide Powder1This standard is issued under the fixed designation C750;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numb
2、er 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 defines the chemical and physicalrequirements for boron carbide powder intended for a varietyof nuclear applications.Because
3、 each application has a differ-ent need for impurity and boron requirements,three differentchemical compositions of powder are specified.In using thisspecification,it is necessary to dictate which type of powder isintended to be used.In general,the intended applications forthe various powder types a
4、re as follows:1.1.1 Type 1For use as particulate material in nuclearreactor core applications.1.1.2 Type 2Powder that will be further processed into afabricated shape for use in a nuclear reactor core or used innon-core applications when the powder directly or indirectlymay cause adverse effects on
5、structural components,such ashalide stress corrosion of stainless steel.1.1.3 Type 3Powder that will be used for non-core appli-cations or special in-core applications.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.2.Referen
6、ced Documents2.1 ASTM Standards:2B527 Test Method for Determination of Tap Density ofMetallic Powders and CompoundsB822 Test Method for Particle Size Distribution of MetalPowders and Related Compounds by Light ScatteringB923 Test Method for Metal Powder Skeletal Density byHelium or Nitrogen Pycnomet
7、ryC371 Test Method for Wire-Cloth Sieve Analysis of Non-plastic Ceramic PowdersC791 Test Methods for Chemical,Mass Spectrometric,andSpectrochemical Analysis of Nuclear-Grade Boron Car-bideE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE105 Practice for Probability Sampling of Materi
8、als2.2 ANSI Standard:3ANSI/ASME NQA-1 Quality Assurance Program Require-ments for Nuclear Facilities2.3 U.S.Government Document:4Title 10,Code of Federal Regulations,Energy Part 50(10CFR 50),Domestic Licensing of Production and Uti-lization Facilities3.Terminology3.1 Definitions of Terms Specific to
9、 This Standard:3.1.1 buyerorganization issuing the purchase order.3.1.2 powder lotthat quantity of boron carbide powderblended together such that samples taken in accordance withthe procedures of 8.1 can be considered as representative of theentire powder lot.3.1.3 sellerboron carbide powder supplie
10、r.4.Ordering Information4.1 The buyer may specify the following information on theorder:4.1.1 Quantity(weight of delivered product).4.1.2 Nominal particle size,particle size range,and appli-cable tolerance.4.1.3 Density and method of measurement.4.1.4 Angular or spherical shape.4.1.5 Shape factor.4.
11、1.6 Lot size.4.1.7 Sampling requirements.4.1.8 Powder type(1,2,or 3).4.1.9 Isotopic content(10B).5.Chemical CompositionNOTE1B4C powder is hygroscopic and certain applications requirelow-moisture content.1This specification is under the jurisdiction of ASTM Committee C26 onNuclear Fuel Cycle and is t
12、he direct responsibility of Subcommittee C26.03 onNeutron Absorber Materials Specifications.Current edition approved Jan.1,2014.Published February 2014.Originallyapproved in 1974.Last previous edition approved in 2009 as C750 09.DOI:10.1520/C0750-09R14.2For referenced ASTM standards,visit the ASTM w
13、ebsite,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.a
14、nsi.org.4Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1 The material shall conf
15、orm to the chemical compositionrequirements prescribed in Table 1(see Methods C791).5.2 When agreed upon between the buyer and the seller,theweight loss of the powder shall not exceed 1%when heated at110C for 1 h in air.6.Physical Requirements6.1 The nominal particle size,particle size range,andappl
16、icable tolerances shall be agreed upon between the buyerand the seller.Method C371 and E11 shall be applied forparticles larger than or equal to 75 m.For particles smallerthan 75 m,the particle size distribution shall be determined bymethod B822.6.2 The density shall be determined when specified.TheTap-density(Test Method B527)or Skeletal Density(TestMethod B923)are approved methods.The recommended valueto be used for the theoretical density of stoichiometric B4C ofnatural isotopic content is 2.
