BS EN 821-2-1997 Advanced technical ceramics — Monolithic ceramics — Thermo-physical properties.pdf
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1、BRITISH STANDARD BS EN 821-2:1997 Advanced technical ceramics Monolithic ceramics Thermo-physical properties Part 2: Determination of thermal diffusivity by the laser flash (or heat pulse) method The European Standard EN 821-2:1997 has the status of a British Standard ICS 81.060.99 BS EN 821-2:1997
2、This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 November 1997 BSI 04-2000 ISBN 0 580 28389 5 National foreword This British Standard is the English la
3、nguage version of EN 821-2:1997. It supersedes BS 7134-4.2:1990. The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any
4、enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The
5、 British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A B
6、ritish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a f
7、ront cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 15 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publica
8、tion Amd. No.DateComments BS EN 821-2:1997 BSI 04-2000i Contents Page National forewordInside front cover Foreword2 Text of EN 821-23 ii blank w w w . b z f x w . c o m EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 821-2 June 1997 ICS 81.060.99 Descriptors: Ceramics, powdery materials, thermo
9、dynamic properties, tests, determination, diffusion, thermal conductivity English version Advanced technical ceramics Monolithic ceramics Thermo-physical properties Part 2: Determination of thermal diffusivity by the laser flash (or heat pulse) method Cramiques techniques avances Cramiques monolithi
10、ques Proprits thermo-physiques Partie 2: Dtermination de la diffusivit thermique par la mthode Flash laser (ou impulsion de chaleur) Hochleistungskeramik Monolithischer Keramik Thermophysikalische Eigenschaften Teil 2: Messung der Temperaturleitfhigkeit mit dem Laserflash- (oder Wrmeimpuls-) Verfahr
11、en This European Standard was approved by CEN on 1997-05-24. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical refer
12、ences concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member in
13、to its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,
14、Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN
15、 national Members. Ref. No. EN 821-2:1997 E w w w . b z f x w . c o m EN 821-2:1997 2 BSI 04-2000 Foreword This European Standard has been prepared by Technical Committee CEN/TC 184, Advanced technical ceramics, the secretariat of which is held by BSI. This European Standard shall be given the statu
16、s of a national standard, either by publication of an identical text or by endorsement, at the latest by December 1997, and conflicting national standards shall be withdrawn at the latest by December 1997. EN 821 consists of three Parts: Part 1: Determination of thermal expansion; Part 2: Determinat
17、ion of thermal diffusivit; Part 3: Determination of specific heat capacity (ENV). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, Fran
18、ce, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Principle3 5Apparatus6 6Test pieces8 7Calibration9 8Test procedure9 9Results10 10Test repo
19、rt11 Annex A (informative) Fundamental equations for calculation12 Annex B (informative) Deviations from ideal behaviour12 Annex C (informative) Bibliography14 Figure 1 Schematic representation of transient at rear face of test piece4 Figure 2 Schematic diagram of thermal diffusivity apparatus5 Figu
20、re 3 Schematic diagram of a typical ambient and low temperature test piece holder7 Figure 4 Heat loss correction curves11 Table 1 Values of constant Wx for a range of transient times10 Table B.1 Coefficients for the decay time heat loss correction13 Table B.2 Finite pulse time correction constants14
21、 w w w . b z f x w . c o m EN 821-2:1997 BSI 04-20003 1 Scope This Part of EN 821 specifies a method for the determination of thermal diffusivity of advanced monolithic technical ceramics, to an accuracy of approximately 5 %. It is suitable for the measurement of thermal diffusivity values in the ra
22、nge 0,1 mm2/s to 1 000 mm2/s at temperatures greater than 180 C. Annex A gives the mathematical derivation of the calculations, and Annex B contains instruction on actions necessary when the calculations cannot be made in the usual way. NOTE 1It is not advisable to exceed the temperature at which th
23、e test piece was manufactured. NOTE 2This method involves the use of a high powered pulsed laser system or high energy photoflash equipment as well as high vacuum and high temperature furnace capability. Such equipment therefore should be operated within established safety procedures. (See EN 60825)
24、. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or rev
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