1、Designation:C18288(Reapproved 2013)Standard Test Method forThermal Conductivity of Insulating Firebrick1This standard is issued under the fixed designation C182;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisio
2、n.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 supplements Test Method C201,andshall be used in conjunction with that test method to determinethe thermal conductivit
3、y of insulating firebrick.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafe
4、ty problems,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:2C155 Classification of Insulating Fi
5、rebrickC201 Test Method for Thermal Conductivity of RefractoriesE220 Test Method for Calibration of Thermocouples ByComparison Techniques3.Significance and Use3.1 The thermal conductivity of insulating firebrick(IFB)isa property required for the selection of IFB for a specificthermal performance.Use
6、rs select brick to provide a specifiedheat-loss and cold-face temperature without exceeding thetemperature limitation of the brick.This test method estab-lishes placement of thermocouples and the positioning of testsamples in the calorimeter.This test method must be used withTest Method C201.4.Appar
7、atus4.1 The apparatus shall consist of that described in theApparatus section of Test Method C201 with the addition ofthermocouples,drilling jig,and refractory fiber paper asdescribed in Sections 6 and 7.5.Test Sample5.1 The test sample shall be selected and prepared asdescribed in the Test Sample a
8、nd Preparation section of TestMethod C201.6.Installation of Thermocouples in Test Specimen6.1 ThermocouplesCalibrated3thermocouples shall beembedded in the test specimen at three points for measuring thetemperature.Chromel-Alumel thermocouples shall be used fortemperatures below 1400F(760C),and abov
9、e that tempera-ture platinum-10%rhodium/platinum thermocouples shall beused.The platinum thermocouples may also be used at thelower temperatures,but the electromotive force(emf)will notbe as high as when using base-metal thermocouples.Wire ofAWG 28(0.320 mm)shall be used for making either type ofthe
10、rmocouple.6.2 Installation of ThermocouplesHoles for the thermo-couple wires shall be drilled through the 412-in.(114-mm)dimension of the test specimen by the use of a drilling jig so asto obtain accurate placement of the thermocouples.The threethermocouples shall be located so that the hot junction
11、 of thefirst couple is 0.20 in.(5.1 mm)below the hot face of the testspecimen,the junction of the second at the midpoint,and thejunction of the third 0.20 in.above the cold face.Thethermocouple wires leading out from the hot junctions shall belocated in planes parallel to the calorimeter surface.In
12、order tohave the hot junctions over the center of the calorimeter,theyshall be located on an axis passing through the center of and atright angles to the 9 by 412-in.(228 by 114-mm)area of the testspecimen.NOTE1Insulating firebrick that cannot be prepared to this precisionbecause of the structure of
13、 the product,should be prepared in accordancewith the instructions for fireclay dense refractories.7.Set-Up of Test Sample and Silicon Carbide Slab7.1 Two strips of refractory fiber paper 1312by12by 0.02in.(343 by 13 by 0.5 mm)shall be placed along the 1312-in.dimension of the inner guard at the out
14、side edges,as shown in1This test method is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.02 on ThermalProperties.Current edition approved Sept.1,2013.Published September 2013.Originallyapproved in 1943.Last previous edition approved
15、in 2009 as C182 88(2009).DOI:10.1520/C0182-88R13.2For 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.3Method E220 spec
16、ifies calibration procedures for thermocouples.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Fig.1.Twelve strips of refractory fiber paper 2 by12by 0.02in.(51 by 13 by 0.5 mm)shall be placed on the outer guard atintervals in the pattern shown in Fig.1.These strips serve asspacers to prevent contact between the test material and thecalorimeter assembly.The test specimen shall be placedcentrally over the center of the calorimeter sect
