1、Designation: C 750 09Standard Specification forNuclear-Grade Boron Carbide Powder1This standard is issued under the fixed designation C 750; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in par
2、entheses 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 eac
3、h 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
4、are 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. Ref
6、erenced Documents2.1 ASTM Standards:2B 527 Test Method for Determination of Tap Density ofMetallic Powders and CompoundsB 822 Test Method for Particle Size Distribution of MetalPowders and Related Compounds by Light ScatteringB 923 Test Method for Metal Powder Skeletal Density byHelium or Nitrogen P
7、ycnometryC 371 Test Method for Wire-Cloth Sieve Analysis of Non-plastic Ceramic PowdersC 791 Test Methods for Chemical, Mass Spectrometric, andSpectrochemical Analysis of Nuclear-Grade Boron Car-bideE11 Specification for Woven Wire Test Sieve Cloth andTest SievesE 105 Practice for Probability Sampli
8、ng Of Materials2.2 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
9、Terms Specific to 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 carbi
10、de powder supplier.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.
11、4.1.5 Shape factor.4.1.6 Lot size.4.1.7 Sampling requirements.4.1.8 Powder type (1, 2, or 3).4.1.9 Isotopic content (10B).5. Chemical CompositionNOTE 1B4C powder is hygroscopic and certain applications requirelow-moisture content.5.1 The material shall conform to the chemical compositionrequirements
12、 prescribed in Table 1 (see Methods C 791).1This specification is under the jurisdiction of ASTM Committee C26 onNuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.03 onNeutron Absorber Materials Specifications.Current edition approved July 1, 2009. Published August 2009. Origin
13、allyapproved in 1974. Last previous edition approved in 2003 as C 750 03.2For referenced ASTM standards, visit the ASTM website, 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 A
14、STM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.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.go
15、v.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 When agreed upon between the buyer and the seller, theweight loss of the powder shall not exceed 1 % when heated at110C for1hinair.6. Physical Requirements Physical Requirements6.
16、1 The nominal particle size, particle size range, andapplicable tolerances shall be agreed upon between the buyerand the seller. Method C 371 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 bymetho
17、d B 822.6.2 The density shall be determined when specified. TheTap-density (Test Method B 527) or Skeletal Density (TestMethod B 923) are approved methods. The recommendedvalue to be used for the theoretical density of stoichiometricB4C of natural isotopic content is 2.52 g/cm2.6.3 When specified, t
18、he angular or spherical shape shall bedetermined utilizing a method agreed upon between the buyerand the seller.6.4 When specified, the shape factor shall be determinedutilizing a method agreed upon between the buyer and theseller.7. Cleanliness7.1 The lot shall be handled in a manner that precludes
19、contamination by dust, organics, plastics, or other foreignmaterials.8. Sampling8.1 Sampling plans to meet acceptance criteria and inspec-tion and measurement procedures that describe the method ofcompliance with this specification shall be established by theseller and submitted to the buyer for app
20、roval. The degree ofsampling, where not specified in this specification, varies withthe application and for this reason should be specified in thepurchase order. Recommended Practice E 105 is referenced asa guide.8.2 Each sample taken shall be sufficient to perform thefollowing in the event they are
21、 necessary or desired by thebuyer:8.2.1 Quality control tests,8.2.2 Acceptance tests,8.2.3 Referee tests,and8.2.4 Retention of archive samples by the seller.8.3 Archive samples shall be retained by the seller for aperiod of time specified by the buyer and delivered to the buyerupon request.9. Inspec
22、tion and Certification9.1 The seller shall inspect the material covered by thisspecification and shall furnish the buyer with certificates oftests showing the results of testing and inspection performedfor each powder lot prior to shipment. The seller shall certifythat each powder lot is in complian
23、ce with the provisions ofthis specification.10. Rejection10.1 Unless the buyer and seller agree otherwise, rejectionand acceptance shall be on a powder lot basis.10.2 Powder lots that fail to conform to the requirements ofthis specification may be rejected by the buyer. The seller maypetition the bu
24、yer to waive selected requirements for identifiedout-of-specification lots. Decision to grant such waiver belongsto the buyer. The buyer shall approve, prior to use, any remedyproposed to bring rejected lots into specification.10.3 In the event of disagreement over the results ofchemical analysis, s
25、amples shall be submitted to a mutuallyselected referee for resolution.11. Packaging and Package Marking11.1 The powder shall be packaged in sealed containers forshipment from the seller to the buyer. The seller will beresponsible for designing the shipping container to ensurecleanliness, minimize m
26、oisture pickup, provide adequate pro-tection against damage during transportation, and ensure rea-sonable ease of unpackaging.11.2 Each container shall be clearly marked with the fol-lowing: boron carbide powder, powder type (1, 2, or 3),purchase order number, purchase order specification, gross net
27、and tare weights, lot number, and name of seller.12. Quality Assurance12.1 Quality assurance requirements shall be agreed uponbetween the buyer and the seller when specified in the purchaseorder. Code of Federal Regulations, Title 10, Part 50 (Appen-dix B) and ANSI/ASME NQA-1 are referenced as guide
28、s.TABLE 1 Chemical RequirementsConstituentComposition, Weight %AType 1 Type 2 Type 3Total boronB81.0 max76.5 min81.0 max73.0 min81.0 max70.0 minHNO3-soluble boron 0.5 max 0.6 max not determinedWater soluble boron 0.2 max 0.2 max 1.0 maxFluoride 25 g/g max 25 g/g max not determinedChloride 75 g/g max
29、 75 g/g max not determinedCalcium 0.3 max 0.3 max not determinedIron 1.0 max 1.0 max 2.0 maxTotal boron plus totalcarbon98.0 min 97.0 min 94.0 minAUnless otherwise indicated (percentages based on a dry weight of boroncarbide).BUnless otherwise specified, the10B isotopic content in the boron shall be
30、 19.906 0.3 atom % for Types 1 and 2 and 19.90 6 0.5 atom % for Type 3.C750092ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the valid
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33、ot 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 Conshohocken, 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).C750093
