ASTM_C_201_-_93_2013.pdf

Designation:C20193(Reapproved 2013)Standard Test Method forThermal Conductivity of Refractories1This standard is issued under the fixed designation C201;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 covers the determination of the com-parative thermal conductivity of refractories under standard-ized conditions of testing.This test method is designed forrefractories having a conductivity factor of not more than 200Btuin./hft2F(2818 W/mK),for a thickness of 1 in.(25 mm).1.2 Detailed ASTM test methods to be used in conjunctionwith this procedure in testing specific types of refractorymaterials are as follows:Test Method C182,Test MethodC202,Test Method C417,and Test Method C767.1.3 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.1.4 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:2C134 Test Methods for Size,Dimensional Measurements,and Bulk Density of Refractory Brick and InsulatingFirebrickC155 Classification of Insulating FirebrickC182 Test Method for Thermal Conductivity of InsulatingFirebrickC202 Test Method for Thermal Conductivity of RefractoryBrickC417 Test Method for Thermal Conductivity of UnfiredMonolithic RefractoriesC767 Test Method for Thermal Conductivity of CarbonRefractoriesE220 Test Method for Calibration of Thermocouples ByComparison Techniques3.Significance and Use3.1 The thermal conductivity of refractories is a propertyrequired for selecting their thermal transmission characteris-tics.Users select refractories to provide specified conditions ofheat loss and cold face temperature,without exceeding thetemperature limitation of the refractory.This test methodestablishes the testing for thermal conductivity of refractoriesusing the calorimeter.3.2 This procedure requires a large thermal gradient andsteady state conditions.The results are based upon a meantemperature.3.3 The data from this test method are suitable for specifi-cation acceptance,and design of multi-layer refractory con-struction.3.4 The use of these data requires consideration of the actualapplication environment and conditions.4.Apparatus4.1 The apparatus shall conform in close detail with thatshown in the approved drawings.3The equipment is shown inFig.1 and Fig.2,and the essential parts are as follows:4.1.1 Heating ChamberA heating chamber,shown in Fig.3,shall be capable of being heated electrically over a tempera-ture range from 400 to 2800F(205 to 1540C)in a neutral oroxidizing atmosphere.The temperature of the heating unit shallbe controlled by a mechanism capable of maintaining thetemperature in the chamber constant to within 65F(63C).Asilicon carbide slab 1312by 9 by 1 in.(342 by 228 by 25 mm),with the 1312by 9-in.(342 by 228 mm)faces plane andparallel,shall be placed above the sample for the purpose ofproviding uniform heat distribution.A layer of insulationequivalent at least to 1 in.(25 mm)of Group 20 insulatingfirebrick(see Classification C155)shall be placed below thecalorimeter and guard plates.1This 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 1945.Last previous edition approved in 2009 as C201 93(2009).DOI:10.1520/C0201-93R13.2For 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 complete set of approved drawings necessary for the construction of theapparatus and suggested operating instructions,each of which requires too muchspace to be included with this test method,were originally drafted by the InsulatingProducts Division of Babcock and Wilcox Co.ASTM has been advised that thesedrawings are no longer available.Subcommittee C08.05 currently is taking thisissue under advisement.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.2 CalorimeterAssemblyAcoppercalorimeterassembly,of the design shown in Fig.4,shall be used formeasuring the quantity of heat flowing through the testspecimen.The water circulation is such that adjacent passagescontain incoming and outgoing streams of water.The calo