1、Designation: C 467 97 (Reapproved 2002)Standard Classification ofMullite Refractories1This standard is issued under the fixed designation C 467; 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
2、 parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This classification covers refractory products consistingpredominantly of mullite (3 Al2O32 SiO2) crystals that areformed by either converting
3、any of the sillimanite group ofminerals, or synthesizing from appropriate materials in a meltor sinter process.2. Referenced Documents2.1 ASTM Standards:C 16 Test Method for Load Testing Refractory Brick atHigh Temperatures2NOTE 1Chemical analysis of refractory products are determined by acombinatio
4、n of x-ray fluorscence (XRF) and inductively coupled plazma(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.C 832 Test Method of Measuri
5、ng the Thermal Expansionand Creep of Refractories Under Load23. Significance and Use3.1 The mullite content of an alumina-silica refractorymaterial has an important influence on volume stability, loadbearing properties, and its satisfactory use in refractory appli-cations. This classification is con
6、sidered useful for purchasespecifications and quality control.4. Properties4.1 The refractory products falling within the scope of thisclassification are classified by chemical and physical tests tomeet the following requirements:Alumina content, %Impurities,Amax, %Deformation,Bmax, %56 to 7955AImpu
7、rities refer to metal oxides other than those of aluminum 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 cutf
8、rom larger shapes, utilizing existing plane surfaces as much aspossible.6. Test Methods6.1 The properties enumerated in this classification shall bedetermined in accordance with the following ASTM meth-ods:6.1.1 Alumina ContentXRF and ICP.6.1.2 Load TestSchedule 6 of Table 1 in Test MethodC 16.6.1.3
9、 Thermal Expansion and CreepMethod C 832.7. Retests7.1 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 ap
10、ply where the first test results may notconform to the 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 alu
11、mino-silicate; classification; mullite; refractories1This 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 appr
12、oved Nov. 10, 1997. Published December 1998. Originallypublished as C 467 61. Last previous edition C 467 84 (1992)e1.2Annual Book of ASTM Standards, Vol 15.01.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM International takes
13、no position respecting the validity of any patent 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 respo
14、nsibility.This standard is subject to revision 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
15、 to ASTM International Headquarters. Your comments 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 a
16、ddress shown below.This standard is copyrighted 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-mail); or through the ASTM website(www.astm.org).C 467 97 (2002)2
