1、BRITISH STANDARD BS EN 24497:1993 ISO 4497:1983 Metallic powders Determination of particle size by dry sieving The European Standard EN 24497:1993 has the status of a British Standard UDC 621.762:669-492.2:6210.928.2:620.1BSEN24497:1993 This British Standard, having been prepared under the direction
2、of the Iron and Steel Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15 June 1993 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference ISM/65 Special announcement in BSINews January 1993 ISBN 0 5
3、80 21936 4 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalis
4、ation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority
5、of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardis
6、eringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN24497:1993 BSI 10-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2
7、1 Scope and field of application 3 2 References 3 3 Principle 3 4 Apparatus 3 5 Preparation of test portion 3 6 Procedure 3 7 Expression of results 4 8 Test report 4 Annex ZA (normative) Normative references to international publications withtheirrelevantEuropean publications 5 National annex NA (in
8、formative) Committees responsible Inside back cover National annex NB (informative) Cross-reference Inside back cover Table 4BSEN24497:1993 ii BSI 10-1999 National foreword This British Standard has been prepared under the direction of the Iron and Steel Standards Policy Committee and is the English
9、 language version of EN24497:1993 Metallic powdersDetermination of particle size by dry sieving, published by the European Committee for Standardization (CEN). It is identical with ISO4497:1983, published by the International Organization for Standardization (ISO). This British Standard supersedes B
10、S 5600-2.12:1987 which is withdrawn and from which it differs by the addition ofAnnex ZA. A British 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 o
11、f itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpo
12、rated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 24497 April 1993 UDC 621.762:669-492.2:6210.928.2:620.1 Descriptors: Powder metallurgy, metallic powder, grain size analysis, sieve analysis, sieves English version Met
13、allic powders Determination of particle size by dry sieving (ISO 4497:1983) Poudres mtalliques Dtermination de la granulomtrie par tamisage sec (ISO 4497:1983) Metallpulver Bestimmung der Teilchengren durch Trockensiebung (ISO 4497:1983) This European Standard was approved by CEN on1993-04-02. CEN m
14、embers 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 on applic
15、ation 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 Secretariat has th
16、e same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standard
17、ization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN24497:1993EEN24497:1993 2 BSI 10-1999 Foreword In 1992, ISO 4497:1983 Metallic powders Determination of particle size by dr
18、y sieving was submitted to the CEN Primary Questionnaire procedure. Following the positive result of the CEN/CS Proposal ISO 4497:1983 was submitted to the Formal Vote. The result of the Formal Vote was positive. This European Standard shall be given the status of a national standard, either by publ
19、ication of an identical text or by endorsement, at the latest by October1993, and conflicting national standards shall be withdrawn at the latest by October1993. According to the Internal Regulations of CEN/CENELEC, the following countries are bound to implement this European Standard: Austria, Belg
20、ium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. NOTEThe European references to international publications are given inAnnex ZA (normative).EN24497:1993 BSI 10-1999 3 1 Scope and field of a
21、pplication This International Standard specifies a method of determining the particle size distribution of metallic powders by dry sieving into size fractions. The method is applicable to dry, unlubricated metallic powders, but not applicable to powders in which the morphology differs markedly from
22、being equiaxial, for example flake-type powders. The method is not applicable to metallic powders having a particle size wholly or mostly under454m. 2 References ISO 565, Test sievesWoven metal wire cloth, perforated plate and electroformed sheetNominal sizes of openings. ISO 2591, Test sieving. 3 P
23、rinciple Separation of the metallic powder into particle size fractions by shaking through a set of wire cloth test sieves arranged in consecutive order of size of aperture openings. Weighing of the fractions retained on each sieve and the fraction passing the finest sieve. 4 Apparatus 4.1 Calibrate
24、d series of non-magnetic wire cloth sieves, having different nominal aperture sizes. Each sieve cloth shall be mounted in a non-magnetic metal frame having a nominal diameter of200mm and a nominal depth within the range25mm to50mm. NOTEISO2591 specifies a nominal depth of50mm. The test sieve frames
25、shall nest snugly with one another, and the set shall be completed with a lid on top and a collecting pan below the bottom sieve. The calibration of sieves shall be carried out according to ISO2591, sub-clause3.1.3. The aperture size of the test sieves shall be chosen from the principal size (R20/3)
26、 sieves of ISO565, but if this is not appropriate the principal sizes can be partly or totally replaced from one of the intermediate sizes (R40/3 or R20). The aperture sizes of the test sieves shall be chosen so as to determine adequately the particle size distribution of the test portion (see claus
27、e7). NOTEAn irregular or partial set of test sieves may be selected, if agreed between the supplier and the purchaser. 4.2 Mechanical sieving machine, if used (see6.2). 4.3 Balance, capable of weighing at least100g to an accuracy of 0,05g. 4.4 Soft brush 5 Preparation of test portion 5.1 In general,
28、 the powder shall be tested in the as-received condition. If necessary, the powder may be dried. However, if the powder is susceptible to oxidation the drying shall take place in vacuum or an inert gas. 5.2 The test portion shall have a mass of approximately100g for powders having an apparent densit
29、y greater than1,50g/cm 3 . If the apparent density of the powder is1,50g/cm 3or less, the mass of the test portion shall be approximately50g. 6 Procedure 6.1 The series of test sieves selected shall be assembled complete with lid and collecting pan in consecutive order of size of apertures, with the
30、 sieve having the largest aperture on top. The test portion shall be placed on the top sieve and this should be closed by a lid. 6.2 The sieving shall be performed either by hand or by means of a mechanical sieving machine. NOTEAs different types of sieving machines are known to give different resul
31、ts when using the same sieves and the same powder, it is generally possible to establish a correlation between different machines for a particular powder. 6.3 The sieving process shall be continued either until the end point of the sieving is reached or for a time to be agreed between the supplier a
32、nd the purchaser. The end point is reached when the quantity passing through the sieve retaining the largest fraction of the test portion in1min is less than0,1% of the test portion in accordance with ISO2591. 6.4 After the sieving process, weigh the fraction contained on each sieve and in the pan t
33、o the nearest0,1g in the case of100g test portion and to the nearest0,05g in the case of50g test portion, commencing with the coarsest fraction and finishing with the fraction in the pan. The powder fraction retained on each sieve shall be collected for weighing as follows: Remove the sieve from the
34、 nest. Gently tip the contents of the sieve to one side and, with the aid of a soft brush, transfer them onto a sheet of glazed paper. Brush any powder adhering to the bottom of the sieve and its frame with a soft brush into the next finer sieve. Invert the sieve over the glazed paper and gently tap
35、 the sieve frame.EN24497:1993 4 BSI 10-1999 Collect the fraction in the pan for weighing in a similar manner. 6.5 The sum of the masses of all the fractions shall be not less than98% of the mass of the test portion. 7 Expression of results The mass of the fractions retained on each sieve and of the
36、one collected in the pan shall be expressed as percentages of the sum of the masses of all the fractions and reported to the nearest0,1%. Any fraction whose percentage is less than0,1% shall be reported as “trace”. The following table of results is given by way of example only. Table 8 Test report T
37、he test report shall include the following information: a) reference to this International Standard; b) all details necessary for identification of the test sample; c) the drying procedure, if the powder has been dried; d) method of sieving and details of the sieving machine if used; e) duration of
38、the sieving; f) the result obtained; g) all operations not specified by this International Standard or in the International Standards to which reference is made, or regarded as optional; h) details of any occurrence which may have affected the result. Sieve size range Sieve fractions 4m g % (m/m) W
39、180 trace trace 180 W 150 0,2 0,2 150 W 106 21,3 21,6 106 W 75 25,5 25,9 75 W 63 11,6 11,8 63 W 45 14,1 14,3 45 25,8 26,2 Total 98,5 100,0 Mass of test portion 99,9 Loss 1,4EN24497:1993 BSI 10-1999 5 Annex ZA (normative) Normative references to international publications with their relevant European
40、 publications 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 revisions of an
41、y of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). Publication Year Title EN/HD Year ISO 565 Test sieves Metal wire cloth, perforated m
42、etal plate and electroformed sheet Nominal sizes of openings ISO 2591 Test sieving 6 blankBSEN24497:1993 BSI 10-1999 National annex NA (informative) Committees responsible The UnitedKingdom participation in the preparation of this European Standard was entrusted by the Iron and Steel Standards Polic
43、y Committee (ISM/-) to Technical Committee ISM/65 upon which the following bodies were represented: British Hardmetal Association Federation of British Engineers (Test Manufacturers) Society of Motor Manufacturers and Traders Limited Coopted member National annex NB (informative) Cross-reference Pub
44、lication referred to Corresponding British Standard ISO 2591 BS1796 Test sieving Part 1:1989 Methods using test sieves of woven wire cloth and perforated metal plateBS EN 24497:1993 ISO 4497:1983 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national
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