1、Designation: C750 09 (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.
2、 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 defines the chemical and physicalrequirements for boron carbide powder intended for a varietyof nuclear applicati
3、ons. Because 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 vario
4、us powder types 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 ad
5、verse effects on 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 thi
6、sstandard.2. Referenced 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
7、or Nitrogen PycnometryC371 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 Probabil
8、ity Sampling 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 Defin
9、itions of 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 sellerb
10、oron carbide 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 spheri
11、cal shape.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.1This specification is under the jurisdiction of ASTM Commit
12、tee C26 onNuclear Fuel Cycle and is the 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
13、 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 ASTM website.3Available from American National Standards Institute (ANSI), 25
14、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.gov.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Cons
15、hohocken, PA 19428-2959. United States15.1 The material shall conform 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 for1hinair.6. Physical Re
16、quirements6.1 The nominal particle size, particle size range, andapplicable 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 determi
17、ned 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 B4Cofnatural isotopic content is 2.52 g/cm2.6.3 When speci
18、fied, the 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 pr
19、ecludescontamination 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
20、for approval. The degree ofsampling, where not specified in this specification, varies withthe application and for this reason should be specified in thepurchase order. Recommended Practice E105 is referenced asa guide.8.2 Each sample taken shall be sufficient to perform thefollowing in the event th
21、ey are 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.
22、 Inspection 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 c
23、ompliance 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
24、 the buyer 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 anal
25、ysis, samples 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, min
26、imize moisture 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, gr
27、oss netand 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 a
28、s guides.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
29、g/g max 75 g/g max not determinedCalcium 0.3 max 0.3 max not determinedIron 1.0 max 1.0 max 2.0 maxTotal boronplus total carbon98.0 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 s
30、hall be 19.90 0.3 atom % for Types 1 and 2 and 19.90 0.5 atom % for Type 3.C750 09 (2014)2ASTM 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
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