1、Designation: C750 09 (Reapproved 2014)C750 18Standard 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 re
2、vision. 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 physical requirements for boron carbide powder intended for a variety of nucleara
3、pplications. Because each application has a different need for impurity and boron requirements, three different chemicalcompositions of powder are specified. In using this specification, it is necessary to dictate which type of powder is intended to beused. In general, the intended applications for
4、the various powder types are as follows:1.1.1 Type 1For use as particulate material in nuclear reactor core applications.1.1.2 Type 2Powder that will be further processed into a fabricated shape for use in a nuclear reactor core or used in non-coreapplications when the powder directly or indirectly
5、may cause adverse effects on structural components, such as halide stresscorrosion of stainless steel.1.1.3 Type 3Powder that will be used for non-core applications or special in-core applications.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are inc
6、luded in this standard.1.3 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization T
7、echnical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2B527 Test Method for Tap Density of Metal Powders and CompoundsB822 Test Method for Particle Size Distribution of Metal Powders and Related Compounds by Light ScatteringB923 Test Method for Metal Powder Skeletal De
8、nsity by Helium or Nitrogen PycnometryC371 Test Method for Wire-Cloth Sieve Analysis of Nonplastic Ceramic PowdersC791 Test Methods for Chemical, Mass Spectrometric, and Spectrochemical Analysis of Nuclear-Grade Boron CarbideC859 Terminology Relating to Nuclear MaterialsE11 Specification for Woven W
9、ire Test Sieve Cloth and Test SievesE105 Practice for Probability Sampling of Materials2.2 ANSI Standard:3ANSI/ASME NQA-1 Quality Assurance Program Requirements for Nuclear Facilities2.3 U.S. Government Document:4Title 10, Part 50 (Appendix B) NRC Regulations, Code of Federal Regulations, Energy Par
10、t 50 (10CFR 50), Domestic Licensingof Production and Utilization Facilities3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 buyerorganization issuing the purchase order.1 This specification is under the jurisdiction ofASTM Committee C26 on Nuclear Fuel Cycle and is the direct r
11、esponsibility of Subcommittee C26.03 on NeutronAbsorberMaterials Specifications.Current edition approved Jan. 1, 2014June 1, 2018. Published February 2014July 2018. Originally approved in 1974. Last previous edition approved in 20092014 asC750 09.C750 09 (2014). DOI: 10.1520/C0750-09R14.10.1520/C075
12、0-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from American National Standards Institute (
13、ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.4 Available 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. Nuclear Regulatory Commission, Washington, DC 20555-0001, htt
14、ps:/www.nrc.gov/reading-rm/doc-collections/cfr/.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurate
15、ly, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1
16、3.1.2 powder lotthat quantity of boron carbide powder blended together such that samples taken in accordance with theprocedures of 8.1 can be considered as representative of the entire powder lot.3.1.3 sellerboron carbide powder supplier.4. Ordering Information4.1 The buyer may specify the following
17、 information on the order:4.1.1 Quantity (weight of delivered product).4.1.2 Nominal particle size, particle size range, and applicable tolerance.4.1.3 Density and method of 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 (
18、1, 2, or 3).4.1.9 Isotopic content (10B).5. Chemical CompositionNOTE 1B4C powder is hygroscopic and certain applications require low-moisture content.5.1 The material shall conform to the chemical composition requirements prescribed in Table 1 (see Methods C791).5.2 When agreed upon between the buye
19、r and the seller, the weight 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, and applicable tolerances shall be agreed upon between the buyer and theseller. Method C371 and E11 shall be applied for
20、particles larger than or equal to 75 m. For particles smaller than 75 m, theparticle size distribution shall be determined by method B822.6.2 The density shall be determined when specified. The Tap-density (Test Method B527) or Skeletal Density (Test MethodB923) are approved methods. The recommended
21、 value to be used for the theoretical density of stoichiometric B4C of naturalisotopic content is 2.52 g/cm2.6.3 When specified, the angular or spherical shape shall be determined utilizing a method agreed upon between the buyer andthe seller.6.4 When specified, the shape factor shall be determined
22、utilizing a method agreed upon between the buyer and the seller.7. Cleanliness7.1 The lot shall be handled in a manner that precludes contamination by dust, organics, plastics, or other foreign materials.8. Sampling8.1 Sampling plans to meet acceptance criteria and inspection and measurement procedu
23、res that describe the method ofcompliance with this specification shall be established by the seller and submitted to the buyer for approval. The degree ofsampling, where not specified in this specification, varies with the application and for this reason should be specified in thepurchase order. Re
24、commended Practice E105 is referenced as a guide.TABLE 1 Chemical RequirementsConstituent Composition, Weight %AType 1 Type 2 Type 3Total boron (B)B 81.0 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 (F
25、) 25 g/g max 25 g/g max not determinedChloride (Cl) 75 g/g max 75 g/g max not determinedCalcium (Ca) 0.3 max 0.3 max not determinedIron (Fe) 1.0 max 1.0 max 2.0 maxTotal boron (B)plus total carbon (C)98.0 min 97.0 min 94.0 minA Unless otherwise indicated (percentages based on a dry weight of boronca
26、rbide).B Unless otherwise specified, the 10B isotopic content in the boron shall be 19.90 0.3 atom % for Types 1 and 2 and 19.90 0.5 atom % for Type 3.C750 1828.2 Each sample taken shall be sufficient to perform the following in the event they are necessary or desired by the buyer:8.2.1 Quality cont
27、rol 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 a period of time specified by the buyer and delivered to the buyer uponrequest.9. Inspection and Certification9.1 The seller shall inspect
28、 the material covered by this specification and shall furnish the buyer with certificates of testsshowing the results of testing and inspection performed for each powder lot prior to shipment. The seller shall certify that eachpowder lot is in compliance with the provisions of this specification.10.
29、 Rejection10.1 Unless the buyer and seller agree otherwise, rejection and acceptance shall be on a powder lot basis.10.2 Powder lots that fail to conform to the requirements of this specification may be rejected by the buyer. The seller maypetition the buyer to waive selected requirements for identi
30、fied out-of-specification lots. Decision to grant such waiver belongs tothe buyer. The buyer shall approve, prior to use, any remedy proposed to bring rejected lots into specification.10.3 In the event of disagreement over the results of chemical analysis, samples shall be submitted to a mutually se
31、lected refereefor resolution.11. Packaging and Package Marking11.1 The powder shall be packaged in sealed containers for shipment from the seller to the buyer. The seller will be responsiblefor designing the shipping container to ensure cleanliness, minimize moisture pickup, provide adequate protect
32、ion against damageduring transportation, and ensure reasonable ease of unpackaging.11.2 Each container shall be clearly marked with the following: boron carbide powder, powder type (1, 2, or 3), purchase ordernumber, purchase order specification, gross netgross, net, and tare weights, lot number, an
33、d name of seller.12. Quality Assurance12.1 Quality assurance requirements shall be agreed upon between the buyer and the seller when specified in the purchase order.NRC Regulations, Code of Federal Regulations, Title 10, Part 50 (Appendix B) andANSI/ASME NQA-1 are referenced as guides.13. Keywords13
34、.1 boron carbide; powderASTM 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 validity of any such patent rights, and the riskof infringe
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