ASTM_C_1525_-_04_2013.pdf

Designation:C152504(Reapproved 2013)Standard Test Method forDetermination of Thermal Shock Resistance for AdvancedCeramics by Water Quenching1This standard is issued under the fixed designation C1525;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 parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method describes the determination of theresistance of advanced ceramics to thermal shock by waterquenching.The method builds on the experimental principle ofrapid quenching of a test specimen at an elevated temperaturein a water bath at room temperature.The effect of the thermalshock is assessed by measuring the reduction in flexuralstrength produced by rapid quenching of test specimens heatedacross a range of temperatures.For a quantitative measurementof thermal shock resistance,a critical temperature interval isdetermined by a reduction in the mean flexural strength of atleast 30%.The test method does not determine thermalstresses developed as a result of a steady state temperaturedifferences within a ceramic body or of thermal expansionmismatch between joined bodies.The test method is notintended to determine the resistance of a ceramic material torepeated shocks.Since the determination of the thermal shockresistance is performed by evaluating retained strength,themethod is not suitable for ceramic components;however,testspecimens cut from components may be used.1.2 The test method is intended primarily for dense mono-lithic ceramics,but may also be applicable to certain compos-ites such as whisker-or particulate-reinforced ceramic matrixcomposites that are macroscopically homogeneous.1.3 Values expressed in this standard test method are inaccordance with the International System of Units(SI)andStandard IEEE/ASTM SI 10.1.4 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 appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C373 Test Method for Water Absorption,Bulk Density,Apparent Porosity,andApparent Specific Gravity of FiredWhiteware Products,Ceramic Tiles,and Glass TilesC1145 Terminology of Advanced CeramicsC1161 Test Method for Flexural Strength of AdvancedCeramics at Ambient TemperatureC1239 Practice for Reporting Uniaxial Strength Data andEstimating Weibull Distribution Parameters for AdvancedCeramicsC1322 Practice for Fractography and Characterization ofFracture Origins in Advanced CeramicsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE616 Terminology Relating to Fracture Testing(Discontin-ued 1996)(Withdrawn 1996)3IEEE/ASTM SI 10 Standard for Use of the InternationalSystem of Units(SI):The Modern Metric System2.2 European Standard:EN 820-3 Advanced Technical CeramicsMonolithicCeramicsThermomechanical PropertiesPart 3:Deter-mination of Resistance to Thermal Shock by WaterQuenching43.Terminology3.1 Definitions:3.1.1 The terms described in Terminologies C1145,E6,andE616 are applicable to this standard test method.Specific termsrelevant to this test method are as follows:1This test method is under the jurisdiction of ASTM Committee C28 onAdvanced Ceramics and is the direct responsibility of Subcommittee C28.01 onMechanical Properties and Performance.Current edition approved Aug.1,2013.Published September 2013.Originallyapproved in 2002.Last previous edition approved in 2009 as C1525 04(2009).DOI:10.1520/C1525-04R13.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from European Committee for Standardization(CEN),36 rue deStassart,B-1050,Brussels,Belgium,http:/www.cenorm.be.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.2 advanced ceramic,na highly engineered,highperformance,predominately non-metallic,inorganic,ceramicmaterial having specific functional attributes.C11453.1.3 critical temperature difference,Tc,ntemperaturedifference between the furnace and the ambient temperaturewater bath that will cause a 30%drop in the average flexuralstrength.3.1.4 flexural strength,f,na measure of the ultimatestrength of a specified beam specimen in bending determined ata given stress rate in a particular environment.3.1.5 fracture toughness,na generic term for measures ofresistance to extension of a crack.E6163.1.6 slow crack growth(SCG),nsubcritical crack growth(extension)which may result