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1、BRITISH STANDARD BS EN 820-3:2004 Advanced technical ceramics Methods of testing monolithic ceramics Thermomechanical properties Part 3: Determination of resistance to thermal shock by water quenching The European Standard EN 820-3:2004 has the status of a British Standard ICS 81.060.30 ? Copyright
2、British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 06:06:05 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- BS EN 820-3:2004 This
3、 British Standard was published under the authority of the Standards Policy and Strategy Committee on 3 September 2004 BSI 3 September 2004 ISBN 0 580 44412 0 National foreword This British Standard is the official English language version of EN 820-3:2004. It supersedes DD ENV 820-3:1994 which is w
4、ithdrawn. The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which
5、 implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publicati
6、on does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/E
7、uropean committee any 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. Summary of pages This document comprises a front cover, an inside front cover, the EN title page,
8、 pages 2 to 12, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontr
9、olled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 06:06:05 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 820-3 August 2004 ICS 81.060.30Supersedes ENV 82
10、0-3:1993 English version Advanced technical ceramics - Methods of testing monolithic ceramics - Thermomechanical properties - Part 3: Determination of resistance to thermal shock by water quenching Cramiques techniques avances - Cramiques monolithiques - Proprits thermomcaniques - Partie 3: Dtermina
11、tion de la rsistance au choc thermique par la mthode de trempe leau Hochleistungskeramik - Prfverfahren fr monolithische Keramik - Thermomechanische Eigenschaften - Teil 3: Bestimmung der Thermoschockbestndigkeit mit dem Wasserabschreckversuch This European Standard was approved by CEN on 24 June 20
12、04. 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 references concerning such national standards may be obtained
13、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 into its own language and notified to the Central Secretari
14、at has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portuga
15、l, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CENAll rights of exploitation in any form and by any means reserved w
16、orldwide for CEN national Members. Ref. No. EN 820-3:2004: E Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 06:06:05 MST Questions or comments about this message: please call
17、 the Document Policy Group at 303-397-2295. -,-,- EN 820-3:2004 (E) 2 Contents page Foreword3 1 Scope.4 2 Normative references 4 3 Principle4 4 Apparatus .5 5 Test pieces5 6 Procedure .6 7 Test report 7 Annex A (informative) Introduction to thermal shock behaviour9 Bibliography 12 Copyright British
18、Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 06:06:05 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- w w w . b z f x w . c o m EN
19、820-3:2004 (E) 3 Foreword This document (EN 820-3:2004) 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 status of a national standard, either by publication of an identical text or b
20、y endorsement, at the latest by February 2005, and conflicting national standards shall be withdrawn at the latest by February 2005. This document supersedes ENV 820-3:1993. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Associatio
21、n. EN 820 Advanced technical ceramics Methods of testing monolithic ceramics Thermomechanical properties consists of five Parts: Part 1: Determination of flexural strength at elevated temperatures Part 2: Determination of self-loaded deformation Part 3: Determination of resistance to thermal shock b
22、y water quenching Part 4: Determination of flexural creep deformation at elevated temperatures Part 5: Determination of elastic moduli at elevated temperatures Part 4 is a European Prestandard (ENV) and Part 5 is a Technical Specification (CEN/TS). According to the CEN/CENELEC Internal Regulations,
23、the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Po
24、land, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 06:06:05 MST Questions or comments about thi
25、s message: please call the Document Policy Group at 303-397-2295. -,-,- w w w . b z f x w . c o m EN 820-3:2004 (E) 4 1 Scope This Part of EN 820 specifies the principles of thermal shock testing, and provides a general method for conducting thermal shock tests by quenching into water for both test
26、pieces and components by quenching into water. NOTE This document does not cover thermal stress developed as a result of steady inhomogeneous temperature within a ceramic body or of thermal expansion mismatch between joined bodies. 2 Normative references The following referenced documents are indisp
27、ensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 623-1, Advanced technical ceramics Monolithic ceramics General and textural properties Part
28、 1: Determination of the presence of defects by dye penetration tests EN 843-1, Advanced technical ceramics Monolithic ceramics Mechanical properties at room temperatures Part 1: Determination of flexural strength EN 60584-1, Thermocouples Part 1: Reference tables (IEC 60584-1:1995) EN 60584-2, Ther
29、mocouples Part 2: Tolerances (IEC 60584-2:1982) EN 60672-2, Ceramic and glass insulating materials Part 2: Methods of test (IEC 60672-2:1999) EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:1999) 3 Principle A set of test pieces is hea
30、ted to a given temperature, and then quickly and smoothly transferred to a water bath. The test pieces or components are then inspected for cracks or other damage, either by an appropriate mechanical test to establish whether weakening has occurred, or by using a dye penetrant to detect the presence
31、 of cracks (see EN 623-1). NOTE 1 Dye penetration tests are unsatisfactory for porous or highly microcracked materials. This thermal shock test determines whether a material or component has a capability of withstanding a water quench through a large temperature difference from high temperature with
32、out failure, under the conditions of heat transfer prevailing in such a quenching environment, and for the given geometry and section thickness. NOTE 2 By agreement between parties an alternative quenching medium may be employed. Details of the medium employed should be incorporated in the report. I
33、f the test pieces for the quench test are available as regular bar shapes, then the inspection after quenching with the mechanical test, such as a flexural test, may be preferred, as it enables the onset of loss of strength with increasing initial temperature to be determined. Sets of at least five
34、test pieces are heated to a series of temperatures above that of the quenching bath, quenched, dried and subjected to a short-term strength test. The temperature drop corresponding to that at which a sudden loss of strength occurs is termed the critical temperature difference, Tc. This temperature d
35、ifference can be estimated using the first kind of thermal shock parameter, R (see A.3.2), to which it is numerically equal at an infinite rate of heat transfer. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bur
36、eau Veritas/5959906001, 11/08/2004 06:06:05 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- w w w . b z f x w . c o m EN 820-3:2004 (E) 5 It should be noted that although the flexural strength test method for monolithic ceramics given in EN
37、843-1 may be employed for testing resistance to thermal shock, because of the small size of the specified test piece an overestimate of the material capability in larger sizes would occur. Larger rod or bar-shaped test pieces specially prepared for the test should be employed if the behaviour of lar
38、ger sections of material or components is to be assessed, e.g. type A test pieces as described in EN 60672-2. As a general rule, thermal shock test results are more or less independent of test piece diameter when this exceeds about 10 mm. 4 Apparatus The apparatus shall consist of: a) temperature-co
39、ntrolled oven capable of maintaining a set of test pieces at a given temperature 5 C; b) suitable test piece holder capable of being transferred rapidly from the oven to the quenching medium within 0,5 s; c) water bath controlled at 20 C 2 C and of sufficient volume that the net temperature rise aft
40、er quenching the test pieces is less than 5 C. There shall be a grid near the bottom of the water bath to prevent hot test pieces from resting directly on the bottom. The temperature of the test pieces in the oven shall be recorded by use of a suitable thermocouple manufactured in accordance with th
41、e manufacturing tolerances stated in EN 60584-2, allowing the use of the reference tables in EN 60584-1 or, alternatively, calibrated in a manner traceable to the International Temperature Scale ITS-90. NOTE The test piece holder may contain several test pieces. Alternatively, test pieces may be low
42、ered or dropped individually from the oven into the quenching medium in accordance with individual circumstances. Care should be taken that no mechanical damage occurs to the test pieces as a result of transfer to the cold bath. Where a flexural strength test is used, the test jig employed for rod o
43、r bar-shaped test pieces and the calculations of strength shall conform to the principles given in EN 843-1. 5 Test pieces Test pieces shall either be specially prepared as rods or bars, or may be in the form of complete components where appropriate. Type A: Rod or bar-shaped test pieces either as-f
44、ired or with a specified surface finish in accordance with the requirements of the thermal shock test in EN 60672-2. Rod-shaped test pieces shall be (10 1) mm diameter, uniform to within 0,1 mm, and of length at least 120 mm. Bar-shaped test pieces shall be (10 1) mm x (10 1) mm, uniform to within 0
45、,1 mm, and of length at least 120 mm. The edges shall be chamfered. Type B: Bar-shaped test pieces either as-fired or with a specified surface finish in accordance with the requirements of EN 843-1, size B. The dimensions shall be (3 0,2) mm x (4 0,2) mm x at least 45 mm. The edges shall be chamfere
46、d. Type C: Complete components in appropriate finished condition. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 06:06:05 MST Questions or comments about this message: please
47、 call the Document Policy Group at 303-397-2295. -,-,- w w w . b z f x w . c o m EN 820-3:2004 (E) 6 Other sizes and shapes of test-piece are permitted subject to agreement between parties. Full details of shape and dimensions shall be recorded in the report. NOTE 1 Test pieces in accordance with Ty
48、pe A will produce results which are applicable to, and give a ranking of materials performance appropriate for, larger components. Test pieces in accordance with Type B will require rather higher quenching temperature differences in order to induce failure. Materials comparisons using this method may be valid for small components of comparable size, but it is possible that it will not correctly rank materials performance for larger