1、Designation: C 750 03Standard 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 (e) 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 ea
3、ch 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 o
5、n 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.2. Referenced Documents2.1 ASTM Standards:B 329 Test Method for Apparent Density of Powders ofRefractory Metals and Compounds by
6、the Scott Volume-ter2C 117 Test Method for Material Finer than 75-m (No. 200)Sieve in Mineral Aggregates by Washing3C 371 Test Method for Wire-Cloth Sieve Analysis of Non-plastic Ceramic Powders4C 493 Test Method for Bulk Density and Porosity of Granu-lar Refractory Materials by Mercury Displacement
7、5C 791 Test Methods for Chemical, Mass Spectrometric, andSpectrochemical Analysis of Nuclear-Grade Boron Car-bide6C 859 Terminology Relating to Nuclear Materials6E 11 Specification for Wire-Cloth Sieves for Testing Pur-poses7E 105 Practice for Probability Sampling of Materials72.2 ANSI Standard:ANSI
8、/ASME NQA-1 Quality Assurance Program Require-ments for Nuclear Facilities82.3 U.S. Government Document:Title 10, Code of Federal Regulations, Energy Part 50(10CFR 50), Domestic Licensing of Production and Uti-lization Facilities93. Terminology3.1 Descriptions of Terms Specific to This StandardTerms
9、shall be defined in accordance with Terminology C 859 exceptfor the following: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 o
10、f theentire powder lot.3.1.3 sellerboron 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
11、 measurement.4.1.4 Angular or spherical 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 u
12、nder 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 10, 2003. Published August 2003. Originallyapproved in 1974. Last previous edition edition approved in 19
13、97 asC 750 89(1997).2Annual Book of ASTM Standards, Vol 02.05.3Annual Book of ASTM Standards, Vol 04.02.4Annual Book of ASTM Standards, Vol 15.02.5Annual Book of ASTM Standards, Vol 15.01.6Annual Book of ASTM Standards, Vol 12.01.7Annual Book of ASTM Standards, Vol 14.02.8Available from American Nat
14、ional Standards Institute, 11 W. 42nd St., 13thFloor, New York, NY 10036.9Available from Superintendent of Documents, U.S. Government PrintingOffice, Washington, DC 20402.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.1 The materi
15、al shall conform to the chemical compositionrequirements prescribed in Table 1 (see Methods C 791).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 Requirements6.1 The nominal particle size, particle si
16、ze range, andapplicable tolerances shall be agreed upon between the buyerand the seller. Method C 371, Test Method C 117, and Speci-fication E 11 may be applied for particles larger than 37 m.For particles smaller than 37 m, the particle size distributionwill be determined utilizing a method submitt
17、ed by the sellerfor approval by the buyer.6.2 The density shall be determined when specified. TheScott Volumeter (Test Method B 329) or Mercury Displace-ment (Test Method C 493) are approved methods. The recom-mended value to be used for the theoretical density ofstoichiometric B4C of natural isotop
18、ic content is 2.52 g/cm2.6.3 When specified, 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 l
19、ot shall be handled in a manner that precludescontamination 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 b
20、y theseller and submitted to the buyer 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 E 105 is referenced asa guide.8.2 Each sample taken shall be sufficient
21、 to perform thefollowing in the event they 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 an
22、d delivered to the buyerupon request.9. 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 sh
23、all certifythat each powder lot is in compliance 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 reject
24、ed by the buyer. The seller maypetition 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 disagr
25、eement over the results ofchemical analysis, 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 shipp
26、ing container to ensurecleanliness, minimize 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 n
27、umber, purchase order specification, gross 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
28、B) and NQA-1 are referenced as 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 m
29、ax not determinedChloride 75 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 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 is
30、otopic content in the boron shall be 19.906 0.3 atom % for Types 1 and 2 and 19.90 6 0.5 atom % for Type 3.C750032ASTM 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 adv
31、ised 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 reviewed every five years andif not revised, either
32、 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 technical committee, which you may attend. I
33、f 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 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).C750033
