1、Designation:C70816Standard Specification forNuclear-Grade Beryllium Oxide Powder1This standard is issued under the fixed designation C708;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 parenthes
2、es 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 physical and chemicalrequirements of nuclear-grade beryllium oxide(BeO)powderto be used in fabricating nuclear components.1.2 T
3、his specification does not include requirements forhealth and safety(1-5).2It recognizes the material as a Class Bpoison and suggests that producers and users become thor-oughly familiar with and comply to applicable federal,state,and local regulations and handling guidelines(1).1.3 Special tests an
4、d procedures are given in Annex A1 andAnnex A2.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.2.Referenced Documents2.1 ASTM Standards:3C373 Test Method for Water Absorption,Bulk Density,Apparent Porosity,andApparent Specifi
5、c Gravity of FiredWhiteware Products,Ceramic Tiles,and Glass TilesC859 Terminology Relating to Nuclear MaterialsC1233 Practice for Determining Equivalent Boron Contentsof Nuclear MaterialsE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE105 Practice for Probability Sampling of Materi
6、als2.2 ASME Standard:ASME NQA-1 Quality Assurance Program Requirementsfor Nuclear Facilities42.3 U.S.Government Standard:Title 10,Code of Federal Regulations,Energy Part 50(10CFR50)Domestic Licensing of Production and Utili-zation Facilities53.Terminology3.1 Definitions:3.1.1 Terms shall be defined
7、in accordance with Terminol-ogy C859 except as defined in 3.2.3.2 Definitions of Terms Specific to This Standard:3.2.1 beryllium oxide powderBeO that contains no hardaggregates larger than No.20 sieve designation(850 m).3.2.2 buyerorganization issuing the purchase order.3.2.3 calcinationprocess of h
8、eating a material to a hightemperature but without fusing in order to drive off volatilematter or to effect physical,chemical,or crystallographicchanges.3.2.4 powder lotthat quantity of beryllium-oxide powderprocessed such that samples taken in accordance with theprocedures of Section 8 can be consi
9、dered as representative ofthe entire powder lot.3.2.5 sellerberyllium oxide powder supplier.4.Ordering Information4.1 The beryllium oxide powder must meet the chemical(Section 5)and physical(Section 6)requirements of thisspecification,based upon samples taken in accordance withSection 8.Deviation fr
10、om these procedures and requirementsor additions to them must be agreed upon between the buyerand the seller.4.2 To be consistent with the requirements in 4.1,the buyermay specify the following information on the order:4.2.1 Quantity(weight of delivered product),4.2.2 Lot size,4.2.3 Degree of calcin
11、ation(optional),4.2.4 Nominal particle size range and applicable tolerancesin accordance with Specification E11(U.S.Standard Sieve1This specification is under the jurisdiction of ASTM Committee C26 onNuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.03 onNeutron Absorber Materi
12、als Specifications.Current edition approved Jan.15,2016.Published February 2016.Originallyapproved in 1983.Last previous edition approved in 2008 as C708 08.DOI:10.1520/C0708-16.2The boldface numbers in parentheses refer to a list of references at the end ofthis standard.3For referenced ASTM standar
13、ds,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.4Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,
14、Two Park Ave.,New York,NY 10016-5990,http:/www.asme.org.5Available 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
15、-2959.United States1 Series).For particle sizes smaller than No.270 sieve designa-tion(53 m),the particle size distribution shall be agreed uponbetween the buyer and the seller,and4.2.5 Sampling requirements.5.Chemical Composition5.1 Beryllium-oxide powder is used for a variety of nuclearapplication
16、s.Depending upon end use,the purity requirementsmay be quite variable.5.2 Use analytical methods as agreed upon between thebuyer and the seller.5.3 Mass loss on drying a 5 to 10-g sample of the powder at110 6 5C for 1 h shall be 0.50%maximum.After drying,themass loss on ignition of the sample at 1000 6 50C for 3 hshall be 1.0%maximum.5.4 Impurity concentrations before drying(see 5.3)shall notexceed the limits given in Table 1.5.5 Sample material(see 5.3)shall not exceed the impuritylimits given
