1、Designation: C467 14 (Reapproved 2018)Standard Classification ofMullite Refractories1This standard is issued under the fixed designation C467; 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 p
2、arentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This classification covers refractory products consistingpredominantly of mullite (3Al2O32SiO2) crystals that areformed by either converting any o
3、f the sillimanite group ofminerals, or synthesizing from appropriate materials in a meltor sinter process.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
4、 considered standard.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization
5、 TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C16 Test Method for Load Testing Refractory Shapes atHigh TemperaturesC832 Test Method of Measuring Thermal Expansion andCreep of Refractories Under LoadNOTE 1Chemical analysis of refractory products is determined
6、 by acombination of X-ray fluorscence (XRF) and inductively coupled plasma(ICP) using standard reference materials (SRM), including various typesof minerals and refractory materials which are available from the NationalInstitute of Standards and Technology and other appropriate sources.3. Significan
7、ce and Use3.1 The mullite content of an alumina-silica refractorymaterial has an important influence on volume stability, load-bearing properties, and its satisfactory use in refractory appli-cations. This classification is considered useful for purchasespecifications and quality control.4. Basis of
8、 Classification4.1 The refractory products falling within the scope of thisclassification are classified by chemical and physical tests tomeet the following requirements:Alumina content, % 56 to 79Impurities,Amax, % 5Deformation,Bmax, % 5AImpurities refer to metal oxides other than those of aluminum
9、 and silicon.BWhen tested in accordance with 6.1.2.5. Test Specimens5.1 Testing for compliance with this classification shall beperformed on 9 by 412 by 212-in. (228 by 114 by 64-mm)rectangular brick as made, or on specimens of this size cutfrom larger shapes, utilizing existing plane surfaces as mu
10、ch aspossible.6. Test Methods6.1 The properties enumerated in this classification shall bedetermined in accordance with the following ASTM methods:6.1.1 Alumina ContentXRF and ICP.6.1.2 Load TestSchedule 6 of Table 1 in Test Method C16.6.1.3 Thermal Expansion and CreepTest Method C832.7. Retests7.1
11、Because of possible variables that may result fromsampling or an unsatisfactory reproducibility of tests bydifferent laboratories, the material may be resampled andretested at the request of either the manufacturer or thepurchaser. This could apply where the first test results may notconform to the
12、requirements prescribed in this classification.Therefore, the final results to be used shall be the average of atleast two series of tests, each of which has been obtained byfollowing the specified testing procedures in detail.8. Keywords8.1 alumino-silicate; classification; mullite; refractories1Th
13、is classification is under the jurisdiction of the ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.92 on The JosephE. Kopanda Subcommittee for Editorial, Terminology, and Classification.Current edition approved Oct. 1, 2018. Published October 2018. Originallyap
14、proved in 1961. Last previous edition approved in 2014 as C467 14. DOI:10.1520/C0467-14R18.2For 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 Su
15、mmary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principl
16、es for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this sta
17、ndard. 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 at any time by the responsible technical committee and must be revi
18、ewed 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 comments will receive careful consideration at a meeting of theresponsib
19、le 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 by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Co
20、nshohocken, 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-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 14 (2018)2
