ASTM C202-1993(2004) 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 2004)Standard 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 rev
2、ision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method supplements Test Method C 201 andshall be used in conjunction with that test method to determinethe thermal
3、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 The values stated in inch-pound units are to be rega
4、rdedas the standard. The values in parentheses are provided forinformation only.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 appro-priate safety and health practices and det
5、ermine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 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 Method for Calibra
6、tion of Thermocouples by Com-parison Techniques3. Significance and Use3.1 The thermal conductivity 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 temperatur
7、e, withoutexceeding the temperature limitation of the brick. This testmethod establishes 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 resu
8、lts are based upon a mean temperature.3.3 The data from this test method are suitable for 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
9、and conditions.4. Apparatus4.1 The apparatus shall consist of that described in TestMethod 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 prepare
10、d inaccordance with Test Method C 201.6. Installation of Thermocouples in Test Specimen6.1 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) sha
11、ll be usedin making the thermocouples.6.2 Installation of Thermocouples The hot junction 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. face of
12、the brick to a depth of132 in. (0.8 mm) bymeans of an abrasive wheel 0.02 in. (0.5 mm) in thickness. Thelayout for the grooves allows all of the cold junction ends ofthe wires to extend from one end of the brick. A groove shallbe cut in the center of each 9 by 412-in. face along the 412-in.dimension
13、 and ending 1 in. (25 mm) from each edge. The pathof each groove is extended at an angle of 90 to one end of thebrick by cutting grooves parallel to and 1.0 in. from the edgeof the specimen. Before cementing4the thermocouple wires inplace, measurements shall be taken to obtain, within 60.01 in.(0.3
14、mm), the eventual distance between the center lines of the1This test method is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.02 on ThermalStress Resistance.Current edition approved Sept. 1, 2004. Published October 2004. Originallyapp
15、roved in 1945. Last previous edition approved in 1998 as C 202 93 (19938).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
16、ASTM website.3Method E 220 specifies calibration procedures for thermocouples.4Alundum Cement RA 562 supplied by the Norton Co., One New Bond St.,Worcester, MA 01606, is satisfactory for this purpose.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,
17、 United States.thermocouple junctions. This shall be done by measuring the212-in. (64-mm) dimension of the brick at the location for thehot junctions and deducting the distance between the centerline of each junction in its embedded position and the surfaceof the brick.7. Set-Up of Back-Up Insulatio
18、n, 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 firebrick (see Classification C 155) for the purposeof obtaining a higher mean temperature in the test specimenthan would result by placing t
19、he 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 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 h
20、orizontal 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. (342 by 13 by 0.5 mm) shall be placed along the 1312-in.dimension of the inner guard at the outside edges. Twelve stripsof refractory fiber paper 2
21、 by12 by 0.02 in. (51 by 13 by 0.5mm) shall be placed on the outer guard at intervals in thepattern shown in Fig. 1. These strips serve as spacers to preventcontact between the test material and the calorimeter assembly.The back-up insulation shall then be placed on the calorimeterassembly so as to
22、provide a level and plane surface. Additionalstrips of refractory fiber paper of the same dimensions shall beplaced in the same pattern upon the back-up insulation. Thesestrips serve as spacers to prevent contact between the fireclaybrick and the back-up insulation. The test specimen shall beplaced
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