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1、BRITISH STANDARD BS EN 23923-2:1993 ISO 3923-2: 1981 Metallic powders Determination of apparent density Part 2: Scott volumeter method The European Standard EN 23923-2:1993 has the status of a British Standard UDC 621.762:669-492.2:620.1:531.755.22 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov
2、 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 23923-2:1993 This British Standard, having been prepared under the direction of the Iron and Steel Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 June 1993 BSI 01-2000 The
3、following BSI references relate to the work on this standard: Committee reference ISM/65 Special announcement in BSI News January 1993 ISBN 0 580 21915 1 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises
4、 the national standards organizations of the following countries: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normu
5、ng e.V. GreeceHellenic Organization for Standardization IcelandTechnological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standar
6、diseringsforbund PortugalInstituto Portugus da Qualidade SpainAsociacin Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComme
7、nts Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 23923-2:1993 BSI 01-2000i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 1Scope and field of application3 2References3 3Principle3 4Symbols an
8、d designations3 5Apparatus3 6Sampling3 7Procedure4 8Expression of results4 9Test report4 Annex ZA (normative) Normative references to international publications with their relevant European publications7 National annex NA (informative) Committees responsibleInside back cover National annex NB (infor
9、mative) Cross-referencesInside back cover Figure 1 Test apparatus Front view5 Figure 2 Test apparatus Side view6 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 23923-2:1993 ii BSI 01-2000 National foreword This British Standard has be
10、en prepared under the direction of the Iron and Steel Standards Policy Committee and is the English language version of EN 23923-2:1993 Metallic powders Determination of apparent density Part 2: Scott volumeter method, published by the European Committee for Standardization (CEN). It is identical wi
11、th ISO 3923-2:1981, prepared by Technical Committee 119, Powder metallurgy, of the International Organization for Standardization (ISO) with the active participation of the UK. This British Standard supersedes BS 5600-2.2.2:1984, which is withdrawn and from which it differs by the addition of Annex
12、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 of itself confer immunity from legal obligations. Summary of pages This document compri
13、ses a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover 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. Lic
14、ensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 23923-2 April 1993 UDC 621.762:669-492.2:620.1:531.755.22 Descriptors: Powder metallurgy, metallic powder, measurements, bulk density English v
15、ersion Metallic powders Determination of apparent density Part 2: Scott volumeter method (ISO 3923-2:1981) Poudres mtalliques Dtermination de la masse volumique apparente Partie 2: Mthode du volumtre de Scott (ISO 3923-2:1981) Metallpulver Ermittlung der Flldichte Teil 2: Scott-Volumeter-Verfahren (
16、ISO 3923-2:1981) This European Standard was approved by CEN on 1993-04-02. 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 bibliog
17、raphical references 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
18、 CEN member into 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Sp
19、ain, 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 1993 Copyright reserved to CEN members Ref. No. EN 23923-2:1993 E Licensed Copy: sheffieldun
20、sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 23923-2:1993 BSI 01-2000 2 Foreword In 1992, ISO 3923-2:1981 Metallic powders Determination of apparent density Part 2: Scott volumeter method was submitted to the CEN Primary Questionnaire procedure. Following the po
21、sitive result of the CEN/CS Proposal ISO 3923-2:1981 was submitted to the CEN Formal Vote. The result of the Formal Vote was positive. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 1993,
22、 and conflicting national standards shall be withdrawn at the latest by October 1993. According to the Internal Regulations of CEN/CENELEC, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Lux
23、embourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. NOTEThe European references to international publications are given in Annex ZA (normative). Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 23923-2:19
24、93 BSI 01-20003 1 Scope and field of application This part of ISO 3923 specifies the Scott volumeter method for the determination of the apparent density of metallic powders. It is applicable to powders that will not flow freely through a 5 mm orifice (see ISO 3923-1). Part 3 of this International S
25、tandard specifies the oscillating funnel method for the determination of apparent density of such powders, and this is preferred since it gives better precision, but it cannot be used in cases where the powder may change its properties due to the vibration action applied to the powder during testing
26、. 2 References ISO 3923-1, Metallic powders Determination of apparent density Part 1: Funnel method. ISO 3923-3, Metallic powders Determination of apparent density Part 3: Oscillating funnel method. 3 Principle Measurement of the mass of a certain quantity of powder which in a loose condition exactl
27、y fills a cup of known volume. The loose condition is obtained, when filling the cup, by cascading the powder over a series of inclined plates in a Scott volumeter (see Figure 1 and Figure 2). The ratio between the mass and the volume represents the apparent density. 4 Symbols and designations 5 App
28、aratus 5.1 Scott volumeter, comprising: 5.1.1 Funnel, having a large and a small conical section separated by a cylindrical section and incorporating a brass sieve of aperture size 1,18 mm. 5.1.2 Baffle box, having a square section, and containing four glass baffles which may be located and retained
29、 by grooves in opposite sides of the box and may thus be removed for ease of cleaning. The baffles are arranged so that the powder falls on to each of them in turn, thereby breaking the fall and reducing the velocity of the stream of powder. It is important that none of the powder can pass between t
30、he upper edge of the glass baffles and the sides of the baffle box. It is also important that the lower edges of the glass baffles are either in line or slightly overlap in a vertical plane. A typical design of Scott volumeter is shown in Figure 1 and Figure 2. Dimensions given with tolerances are m
31、andatory. The other dimensions represent those most frequently used and may vary slightly, provided that the principle requirements previously mentioned are maintained. 5.1.3 Stand and horizontal vibration-free base, to support the cup, box and funnel coaxially at the heights indicated in the figure
32、s. 5.2 Cylindrical cup, having a capacity of 25 0,05 cm3 and an internal diameter of 30 1 mm. NOTEThe cup and funnels should be made of non-magnetic, corrosion-resistant metallic material having sufficient wall thickness and hardness to avoid distortion and excessive wear. The inner surfaces of the
33、cup and funnels should be polished. 5.3 Balance, of sufficient capacity, permitting weighing to an accuracy of 0,05 g. 6 Sampling 6.1 The test sample shall be of at least 100 cm3 volume to allow the determination to be carried out on three test portions. 6.2 In general the powder should be tested in
34、 the as-received condition. In certain instances the powder may be dried. However, if the powder is susceptible to oxidation, the drying shall take place in vacuum or in inert gas. If the powder contains volatile substances it shall not be dried. SymbolDesignationUnit aApparent density of metallic p
35、owders (general term) g/cm3 asApparent density obtained by the Scott volumeter method g/cm3 mMass of the powderg VVolume of the cupcm3 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 23923-2:1993 4 BSI 01-2000 7 Procedure 7.1 Pour or feed
36、 the powder carefully by means of a spatula into the funnel until the cup is completely filled and powder flows over. 7.2 If the powder is not free flowing, its passage through the sieve may be aided by light brushing with a soft brush. NOTEIf light brushing is not sufficient to make the powder flow
37、 through the sieve, the Scott volumeter method is not applicable to this powder. 7.3 Level the powder with a straight-edge, taking care not to compress or pull out powder and not to disturb or vibrate the cup. 7.4 After levelling the powder, tap the cup to settle the powder in order to avoid spillin
38、g it during transport. Make sure that there are no adhering particles on the exterior of the cup. 7.5 Determine the mass of the powder to the nearest 0,05 g. Carry out the determinations on three test portions. 8 Expression of results The apparent density is given by the formula Report the arithmeti
39、cal mean of three determinations to the nearest 0,01 g/cm3, and the highest and the lowest results if the scatter between results exceeds 1 % of the mean. 9 Test report The test report shall include the following information: a) reference to this International Standard; b) all details necessary for
40、the identification of the test sample; c) the drying procedure, if the powder has been dried; d) the result obtained; e) all operations not specified in this International Standard, or regarded as optional; f) details of any occurrence which may have affected the result. Licensed Copy: sheffieldun s
41、heffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 23923-2:1993 BSI 01-20005 Figure 1 Test apparatus Front view Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 23923-2:1993 6 BSI 01-2000 Figure 2 Test appara
42、tus Side view Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 23923-2:1993 BSI 01-20007 Annex ZA (normative) Normative references to international publications with their relevant European publications This European Standard incorporates
43、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 any of these publications apply to this European Sta
44、ndard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). PublicationYearTitleEN/HDYear ISO 3923-1Metallic powders Determination of apparent density Part 1: Funnel method EN 23923-1 ISO 3923-3
45、Metallic powders Determination of apparent density Part 3: Oscillating funnel method EN 23923-3 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 8 blank Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrol
46、led Copy, (c) BSI BS EN 23923-2:1993 BSI 01-2000 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Iron and Steel Standards Policy Committee (ISM/-) to Technical Committee ISM/65, upon which the f
47、ollowing 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-references Publication referred toCorresponding British Standard ISO 3923-1:197
48、9 EN 23923-1:1993 BS EN 23923 Metallic powders Determination of apparent density Part 1:1993 Funnel method ISO 3923-3:1986 EN 23923-3:1993 BS 5600 Powder metallurgical materials and products Part 2 Methods of sampling and testing metallic powders Section 2.2 Determination of apparent density Subsect
49、ion 2.2.3:1984 Oscillating funnel method Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 09:15:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 23923-2:1993 ISO 3923-2: 1981 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Sta