ASTM C863-2000(2010) Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated Temperatures《高温时评定碳化硅耐火材料抗氧化性的标准试验方法》.pdf

《ASTM C863-2000(2010) Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated Temperatures《高温时评定碳化硅耐火材料抗氧化性的标准试验方法》.pdf》由会员分享，可在线阅读，更多相关《ASTM C863-2000(2010) Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated Temperatures《高温时评定碳化硅耐火材料抗氧化性的标准试验方法》.pdf（2页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: C863 00 (Reapproved 2010)Standard Test Method forEvaluating Oxidation Resistance of Silicon CarbideRefractories at Elevated Temperatures1This standard is issued under the fixed designation C863; the number immediately following the designation indicates the year oforiginal adoption or,

2、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 evaluation of the oxidationresistance of silicon carb

3、ide refractories at elevated tempera-tures in an atmosphere of steam. The steam is used toaccelerate the test. Oxidation resistance is the ability of thesilicon carbide (SiC) in the refractory to resist conversion tosilicon dioxide (SiO2) and its attendant crystalline growth.1.2 This standard does n

4、ot 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 Standar

5、ds:2C20 Test Methods for Apparent Porosity, Water Absorption,Apparent Specific Gravity, and Bulk Density of BurnedRefractory Brick and Shapes by Boiling WaterC830 Test Methods for Apparent Porosity, Liquid Absorp-tion, Apparent Specific Gravity, and Bulk Density ofRefractory Shapes by Vacuum Pressur

6、eC914 Test Method for Bulk Density and Volume of SolidRefractories by Wax Immersion3. Significance and Use3.1 The oxidation of silicon carbide refractories at elevatedtemperatures is an important consideration in the application ofthese refractories. The product of oxidation is amorphous silicaor cr

7、istobalite, depending upon the temperature at whichoxidation takes place. This oxide formation is associated withexpansion and degradation of strength. The quantity of watervapor in the atmosphere greatly affects the rate of oxidation.3.2 The test, which creates and measures the expansion, issuitabl

8、e for guidance in product development and relativecomparison in application work where oxidation potential is ofconcern. The variability of the test is such that it is notrecommended for use as a referee test.4. Apparatus4.1 Heated ChamberThe chamber shall be muffled (Note1) to confine the atmospher

9、e. The size of the chamber and theheat source are optional. The temperature capability within thechamber shall be at least 1200C (2190F) with an allowabledeviation of 615C (27F) measured across the hearth.NOTE 1Silicon carbide refractory material is recommended for use asthe muffle but other suitabl

10、e refractory materials may be used.4.2 InstrumentControl and record the temperature of thechamber by a suitable instrument capable of maintaining therequirements in 4.1. Recommended thermocouple location iswithin 1 in. (25 mm) of the top of the specimens and over thecenter of the same assemblage.5.

11、Test Specimen5.1 Specimen SizeObtain a quarter-brick size from a229-mm (9-in.) straight by cutting the brick along planesparallel to both the 229 by 64-mm (9 by 212-in.) and the 114 by64-mm (412 by 212-in.) faces. Alternative specimens may betile, 165 by 114 by 22 mm (612 by 412 by78 in.), or otherc

12、onvenient shapes.5.2 Three specimens are required for each set of conditions.6. Conditions6.1 AtmosphereSteam is passed into the chamber (4.1)atthe rate of 32 kg/m3(2 lb/ft3) of chamber volume per hour.Provisions should be made to uniformly distribute steam withinthe chamber.6.2 The standard test te

13、mperatures are as follows with newsamples used at each temperature. Each temperature consti-tutes a test.800C (1470F)900C (1650F)1000C (1830F)1100C (2010F)1200C (2190F)1This test method is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C0

14、8.04 on ChemicalBehaviors.Current edition approved Nov. 1, 2010. Published November 2010. Originallyapproved in 1977. Last previous edition approved in 2005 as C863 00 (2005).DOI: 10.1520/C0863-00R10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Servic

15、e at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.The test temperature is selected on the basis

16、of the specificneeds that relate to the environment in which the product is toserve. The use of at least the three test temperatures 900C,1000C, and 1100C is recommended when characterization ofthe product is desired.6.3 DurationHold at the specified temperature for 500 h.7. Procedure7.1 Measure the

17、 weight and volume of each specimen to60.1 g and 60.1 cm3, respectively, in accordance with TestMethods C20, C830,orC914, especially recommended forfriable samples.7.2 Place the specimens in the chamber and seal thechamber. Bring the chamber to the specified test temperatureand then introduce steam

18、at the prescribed rate (6.1).7.3 Upon completion of the 500-h period at the prescribedtemperature, shut off the steam supply and then the heat source.When specimens are cool, measure the weight and volumeusing the same method used for 7.1, and calculate the bulkdensity.8. Report8.1 The average perce

19、nt volume change based on theoriginal volume is reported as the prime variable with weight,bulk density, and length changes included as supplementaryinformation. The percent volume change equals 100 times thedifference between the new and original volume all divided bythe original volume, orVolume C

20、hange, % 5Vn2 Vo!Vo3 100where:Vn= new volume andVo= original volume.9. Precision and Bias9.1 Interlaboratory Test Data and AnalysisThree speci-mens each of five different materials were tested by fivelaboratories. The test data and analyses used in establishingthis precision statement are filed as a

21、 round robin.3Thevariable measured is percent volume expansion, the testtemperature 1100C (2010F).9.2 PrecisionTwo averages of observed values should beconsidered significantly different at the 95 % probability levelif the difference equals or exceeds the critical differences listedin Table 1.9.3 Bi

22、asNo justifiable statement on bias can be madesince the true or standard value of volume expansion for thesematerials cannot be established by an accepted referencemethod.10. Keywords10.1 oxidation; refractories; silicon carbideASTM International takes no position respecting the validity of any pate

23、nt rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision

24、at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comme

25、nts will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted

26、 by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-ma

27、il); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C08-1004.TABLE 1 Exa

28、mple of Critical Difference ValuesANumber of Ob-servations inEach AverageCritical Difference BetweenAverages, Units of MeasureSingle-OperatorBetween-LaboratoryFrit Bonded SiC 3 3.26 18.11Clay Bonded SiC 3 32.13 31.34Fines Bonded SiC 3 0.39 0.81Silicon OxynitrideBonded SiC 3 1.91 7.25Silicon NitrideBonded SiC 3 0.27 0.56AThis table is excerpted from RR:C08-1004, available from ASTM Headquar-ters.C863 00 (2010)2