1、Designation:D837721aStandard Guide forHigh Temperature Strength Measurements of GraphiteImpregnated with Molten Salt1This standard is issued under the fixed designation D8377;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year o
2、f last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1This guide covers the best practice for strength mea-surements at elevated temperature of graphite impregnatedwith molten
3、 salt.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish ap
4、pro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDe
5、velopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C651 Test Method for Flexural Strength of ManufacturedCarbon and GraphiteArticles Using Four-Point Loading atRoom
6、 TemperatureC695 Test Method for Compressive Strength of Carbon andGraphiteC749 Test Method for Tensile Stress-Strain of Carbon andGraphiteD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD8091 Guide for Impregnation of Graphite with Molten SaltD8289 Test Method for Tensile
7、 Strength Estimate by DiscCompression of Manufactured GraphiteE4 Practices for Force Verification of Testing Machines3.Terminology3.1 For definitions of terms used in this guide,refer toTerminology D4175.4.Summary of Guide4.1 There is currently a set of ASTM standards as stated in2.1 that can be app
8、lied to graphite for different strengthmeasurements(Test Methods C651,C695,C749,D8289).Each of these standards has been developed specifically toprovide a method of measurement for graphite as a singlematerial.However,in some applications such as in molten saltreactors,graphite components are submer
9、ged in a molten salt.In order to assess the effect of molten salt on graphitecomponents,a method may be necessary for the measurementof strength for graphite specimens both impregnated withmolten salt and at elevated temperatures(see Section 6).Theobjective of this guide is to provide advice on the
10、applicationof selected standards for graphite specimens impregnated withmolten salt and tested at elevated temperatures.This includestransportation of graphite specimens impregnated with moltensalt,temperature measurement,equipment for measuringcompressive,tensile,or flexural strength at elevatedtem
11、perature,and safe handling of the molten salt.5.Significance and Use5.1 The Molten Salt Reactor is a nuclear reactor which usesgraphite as reflector and structural material,and molten salt ascoolant.The graphite components will be submerged in themolten salt during the lifetime of the reactor.The po
12、rousstructure of graphite may lead to molten salt permeation,whichcan affect the thermal and mechanical properties of graphite.Consequently,it may be necessary to measure the variousstrengths of the manufactured graphite materials after impreg-nation with molten salt and before exposure to the react
13、orenvironment in a range of test configurations in order fordesigners or operators to assess their performance.NOTE1Depending upon the salt selected for the reactor,there may besome chemical reaction between the salt and the graphite that could affectproperties.The user should establish,prior to fol
14、lowing this guide,that1This guide is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.F0 on Manufactured Carbon and Graphite Products.Current edition approved July 1,2021.Published July 2021.Originally
15、 approvedin 2021.Last previous edition approved in 2021 as D8377 21.DOI:10.1520/D8377-21A.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
16、page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT
