ASTM C202-1993(2009)e1 Standard Test Method for Thermal Conductivity of Refractory Brick《耐火砖导热性的标准试验方法》.pdf
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1、Designation: C 202 93 (Reapproved 2009)1Standard Test Method forThermal Conductivity of Refractory Brick1This standard is issued under the fixed designation C 202; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEUnits usage was updated in April 2009.1. Scope1.1 This test method supplements Test Method C 201 andshall be used in conjunction wit
3、h that test method to determinethe thermal conductivity of refractory brick with the exceptionof insulating firebrick (use Test Method C 182), and carbonrefractories. This test method is designed for refractorieshaving a conductivity factor of not more than 200 Btuin./hft2F (28.8 W/mK).1.2 UnitsThe
4、values stated in inch-pound units are to beregarded as standard. The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.1.2.1 ExceptionCertain flow and weight measurementsare expressed in SI units only.1.3 This st
5、andard 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
6、 ASTM Standards:2C 155 Classification of Insulating FirebrickC 182 Test Method for Thermal Conductivity of InsulatingFirebrickC 201 Test Method for Thermal Conductivity of Refracto-riesE 220 Test Method for Calibration of Thermocouples ByComparison Techniques3. Significance and Use3.1 The thermal co
7、nductivity of refractory brick is a prop-erty required for selecting their thermal transmission charac-teristics. Users select refractory brick to provide specifiedconditions of heat loss and cold face temperature, withoutexceeding the temperature limitation of the brick. This testmethod establishes
8、 placement of thermocouples and position-ing of test specimens in the calorimeter.3.2 This procedure must be used with Test Method C 201and requires a large thermal gradient and steady state condi-tions. The results are based upon a mean temperature.3.3 The data from this test method are suitable fo
9、r specifi-cation acceptance, estimating heat loss and surface tempera-ture, and design of multi-layer refractory construction.3.4 The use of these data requires consideration of the actualapplication environment and conditions.4. Apparatus4.1 The apparatus shall consist of that described in TestMeth
10、od C 201 with the addition of thermocouples, back-upinsulation, and refractory fiber paper as described in Sections 6and 7 of this test method.5. Test Specimens5.1 The test specimens shall be selected and prepared inaccordance with Test Method C 201.6. Installation of Thermocouples in Test Specimen6
11、.1 ThermocouplesCalibrated3thermocouples shall beembedded in the test specimen at two points for measuringtemperature. Platinum-10 % rhodium/platinum thermocouplesshall be used. Wire of AWG Gage 28 (0.320 mm) shall be usedin making the thermocouples.6.2 Installation of Thermocouples The hot junction
12、 of thethermocouples shall be placed in the center of each 9- by412-in. (228- by 114-mm) face and just below the surface of thetest specimen. Grooves to receive the wire shall be cut in each9- by 412-in. (228- by 114-mm) face of the brick to a depth of132 in. (0.8 mm) by means of an abrasive wheel 0
13、.02 in. (0.5mm) in thickness. The layout for the grooves allows all of thecold junction ends of the wires to extend from one end of thebrick. A groove shall be cut in the center of each 9 by 412-in.(228- by 114-mm) face along the 412-in. (114-mm) dimensionand ending 1 in. (25.4 mm) from each edge. T
14、he path of each1This 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 March 1, 2009. Published April 2009. Originallyapproved in 1945. Last previous edition approved in 200
15、4 as C 202 93 (2004).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 E 220 specifies calibration proc
16、edures for thermocouples.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.groove is extended at an angle of 90 to one end of the brickby cutting grooves parallel to and 1.0 in. (25.4 mm) from theedge of the specimen. Before cementing4
17、the thermocouplewires in place, measurements shall be taken to obtain, within60.01 in. (0.3 mm), the eventual distance between the centerlines of the thermocouple junctions. This shall be done bymeasuring the 212-in. (64-mm) dimension of the brick at thelocation for the hot junctions and deducting t
18、he distancebetween the center line of each junction in its embeddedposition and the surface of the brick.7. Set-Up of Back-Up Insulation, Specimen, and SiliconCarbide Slab7.1 The calorimeter and inner and outer guards shall becovered with a 0.50-in. (12.7-mm) thick layer of Group 20insulating firebr
19、ick (see Classification C 155) for the purposeof obtaining a higher mean temperature in the test specimenthan would result by placing the specimen directly over thecalorimeter area. The back-up insulation shall be cut andground so as to provide surfaces that are plane and do not varyfrom parallel by
20、 more than 60.01 in (0.3 mm). The sides of thepieces that are to be placed in contact shall be ground plane andat right angles to the horizontal faces. The joints between thepieces shall be tight without the use of any mortar.7.2 Two strips of refractory fiber paper 1312 by12 by 0.02in. (343 by 13 b
21、y 0.5 mm) shall be placed along the 1312-in.(343 mm) dimension of the inner guard at the outside edges.Twelve strips of refractory fiber paper 2 by12 by 0.02 in. (51by 13 by 0.5 mm) shall be placed on the outer guard at intervalsin the pattern shown in Fig. 1. These strips serve as spacers toprevent
22、 contact between the test material and the calorimeterassembly. The back-up insulation shall then be placed on thecalorimeter assembly so as to provide a level and plane surface.Additional strips of refractory fiber paper of the same dimen-sions shall be placed in the same pattern upon the back-upin
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