1、Designation:C109808(Reapproved 2015)Standard Specification forNuclear-Grade Hafnium Oxide Powder1This standard is issued under the fixed designation C1098;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber 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 physical and chemicalrequirements for hafnium oxide powder intended for fabrica-tion into shapes for use in a
3、nuclear reactor core.1.2 The material described herein shall be particulate innature.1.3 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:2C117 Test Method for Materials Finer than 75-m(No.
4、200)Sieve in Mineral Aggregates by WashingC371 Test Method for Wire-Cloth Sieve Analysis of Non-plastic Ceramic PowdersC859 Terminology Relating to Nuclear MaterialsE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE105 Practice for Probability Sampling of Materials2.2 ANSI/ASME Standa
5、rd:NQA-1 ASME Quality Assurance Program Requirementsfor Nuclear Facility Applications32.3 U.S.Government Standard:Code of Federal Regulations,Title 10,Part 50,Energy(10CFR 50),Domestic Licensing of Production and Utiliza-tion Facilities43.Terminology3.1 Terms shall be defined in accordance with Term
6、inologyC859 except for the following:3.2 buyerthe organization issuing the purchase order.3.3 hafnium oxide powderhafnium oxide that contains nohard aggregates larger than 20 mesh(840 m).3.4 phase transformationthe rearrangement of the atomicordering of a crystalline lattice as material is cycled th
7、rough acritical transformation or inversion temperature;the changefrom one crystalline phase to another may be accompanied bya volume change that could lead to cracks or defects inproducts fabricated from such materials.5,63.5 powder lota specified quantity of hafnium oxidepowder(with stabilizing ad
8、ditive,if applicable)blended to-gether such that samples taken in accordance with the proce-dures of Section 8 can be considered as representative of theentire quantity.3.6 sellerthe hafnium oxide powder processor.3.7 stabilizing additivematerial which,when added insufficient concentration to the su
9、bject material exhibiting thephase transformation,produces a stabilized crystalline phasethat does not undergo a transformation at any temperaturewithin the expected fabrication or usage regime of the manu-factured product;the potentially deleterious volume change istherefore avoided.4.Ordering Info
10、rmation4.1 The buyer shall 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 tolerances.Test Method C371 and Test Method C117 andSpecification E11 may be applied for particles larger than 37m.For
11、particle sizes less than 37 m,the particle sizedistribution will be determined using a method agreed uponbetween the buyer and the seller.4.1.3 Stabilizing AdditiveThe amount and types of stabi-lizing additives(if any,including limits).4.1.4 Lot size.1This specification is under the jurisdiction of
12、ASTM Committee C26 onNuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.03 onNeutron Absorber Materials Specifications.Current edition approved Jan.1,2015.Published January 2015.Originallyapproved in 1988.Last previous edition approved in 2008 as C1098 08.DOI:10.1520/C1098-08R15
13、.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 ASTM website.3Available from American National Standards Institute(ANSI),25 W.
14、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.5Curtis,C.E.,Doney,L.M.,and Johnson,J.R.,“Some Properties of HafniumOxide,Hafnium Silicat
15、e,Calcium Hafnate,and Hafnium Carbide,”Journal ofAmerican Ceramic Society,Vol 37,1954,pp.458465.6Brown,L.M.,and Mazdiyasni,K.S.,“Characterization of Alkoxy-DerivedYttria-Stabilized Hafnia,”Journal of American Ceramic Society,Vol 53,1970,pp.590594.Copyright ASTM International,100 Barr Harbor Drive,PO
16、 Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.5 Sampling requirements.5.Chemical Composition5.1 A stabilizing additive may be utilized with the hafniumoxide.The recommended stabilizing additive is yttrium oxide(Y2O3).The typical concentration range is 7 to 10 weight%Y2O3in the finished product.References to other stabilizingadditives(such as calcium oxide(CaO)and magnesium oxide(MgO)may be found in the literature and may be used ifagreed upon between the buyer and the seller.Howev
