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 621.762:669-492.2:620.1:531.755.22BSEN23923-2:1993 This British Standard, having been
2、prepared under the directionof the Iron and Steel Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15June 1993 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ISM/65 Special announcement in BS
3、INews January 1993 ISBN 0 580 21915 1 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
4、 Institut belge de normalisation 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 Na
5、tional Standards Authority 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 Cer
6、tificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN23923-2:1993 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover Nat
7、ional foreword ii Foreword 2 1 Scope and field of application 3 2 References 3 3 Principle 3 4 Symbols and designations 3 5 Apparatus 3 6 Sampling 3 7 Procedure 4 8 Expression of results 4 9 Test report 4 Annex ZA (normative) Normative references to international publications with their relevant Eur
8、opean publications 7 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back cover Figure 1 Test apparatus Front view 5 Figure 2 Test apparatus Side view 6BSEN23923-2:1993 ii BSI 01-2000 National foreword This British Stan
9、dard has been prepared under the direction of the Iron and SteelStandards Policy Committee and is the English language version of EN23923-2:1993 Metallic powders Determination of apparent density Part2: Scott volumeter method, published by the European Committee for Standardization (CEN). It is iden
10、tical with ISO3923-2:1981, prepared by Technical Committee119, Powder metallurgy, of the International Organization for Standardization (ISO) with the active participation of the UK. This British Standard supersedes BS5600-2.2.2:1984, which is withdrawn and from which it differs by the addition ofAn
11、nex 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 co
12、mprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to8, 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.EUROP
13、EAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN23923-2 April1993 UDC621.762:669-492.2:620.1:531.755.22 Descriptors: Powder metallurgy, metallic powder, measurements, bulk density English version Metallic powders Determination of apparent density Part 2: Scott volumeter method (ISO 3923-2:1981) Poudr
14、es mtalliques Dtermination de la masse volumique apparente Partie 2: Mthode du volumtre de Scott (ISO3923-2:1981) Metallpulver Ermittlung der Flldichte Teil 2: Scott-Volumeter-Verfahren (ISO 3923-2:1981) This European Standard was approved by CEN on1993-04-02. CEN members are bound to comply with th
15、e 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 application to the Central Secretariat o
16、r 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 the same status as the official vers
17、ions. 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 UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisat
18、ion 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 EEN23923-2:1993 BSI 01-2000 2 Foreword In 1992, ISO3923-2:1981 Metallic powders Determination of apparent density Part 2: Scott volumeter method
19、 was submitted to the CEN Primary Questionnaire procedure. Following the positive result of the CEN/CS Proposal ISO3923-2:1981 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 publicat
20、ion 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, Belgium,
21、 Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. NOTEThe European references to international publications are given in Annex ZA (normative).EN23923-2:1993 BSI 01-2000 3 1 Scope and field of
22、application This part of ISO3923 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 a5mm orifice (seeISO3923-1). Part 3 of this International Standard specifies the oscillating funnel m
23、ethod 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. 2 References ISO 3923-1, Metallic powder
24、s 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 exactly fills a cup of known volume. The loose c
25、ondition is obtained, when filling the cup, by cascading the powder over a series of inclined plates in a Scott volumeter (seeFigure 1 and Figure 2). The ratio between the mass and the volume represents the apparent density. 4 Symbols and designations 5 Apparatus 5.1 Scott volumeter, comprising: 5.1
26、.1 Funnel, having a large and a small conical section separated by a cylindrical section and incorporating a brass sieve of aperture size1,18mm. 5.1.2 Baffle box, having a square section, and containing four glass baffles which may be located and retained by grooves in opposite sides of the box and
27、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 the upper edge of the glass baffles and the si
28、des 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 inFigure 1 and Figure 2. Dimensions given with tolerances are mandatory. The other dimensions represent those
29、 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 figures. 5.2 Cylindrical cup, having a capacity of25
30、 0,05cm 3and an internal diameter of301mm. 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 cup and funnels should be polished. 5.3 Balance, of
31、 sufficient capacity, permitting weighing to an accuracy of 0,05g. 6 Sampling 6.1 The test sample shall be of at least100cm 3volume to allow the determination to be carried out on three test portions. 6.2 In general the powder should be tested in the as-received condition. In certain instances the p
32、owder 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. Symbol Designation Unit a Apparent density of metallic powders (general term) g/cm 3 as Apparent density ob
33、tained by the Scott volumeter method g/cm 3 m Mass of the powder g V Volume of the cup cm 3EN23923-2:1993 4 BSI 01-2000 7 Procedure 7.1 Pour or feed 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 flow
34、ing, 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 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
35、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 spilling 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 nearest0,0
36、5g. Carry out the determinations on three test portions. 8 Expression of results The apparent density is given by the formula Report the arithmetical mean of three determinations to the nearest0,01g/cm 3 , and the highest and the lowest results if the scatter between results exceeds1% of the mean. 9
37、 Test report The test report shall include the following information: a) reference to this International Standard; b) all details necessary for 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 thi
38、s International Standard, or regarded as optional; f) details of any occurrence which may have affected the result.EN23923-2:1993 BSI 01-2000 5 Figure 1 Test apparatus Front viewEN23923-2:1993 6 BSI 01-2000 Figure 2 Test apparatus Side viewEN23923-2:1993 BSI 01-2000 7 Annex ZA (normative) Normative
39、references to international publications with their relevant European 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 hereaft
40、er. For dated references, subsequent amendments to or revisions of any 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 Yea
41、r Title EN/HD Year ISO 3923-1 Metallic powders Determination of apparentdensity Part 1: Funnel method EN 23923-1 ISO 3923-3 Metallic powders Determination of apparentdensity Part 3: Oscillating funnelmethod EN 23923-38 blankBSEN23923-2:1993 BSI 01-2000 National annex NA (informative) Committees resp
42、onsible 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 following bodies were represented: British Hardmetal Association Federation of British Engineers
43、(Test Manufacturers) Society of Motor Manufacturers and Traders Limited Coopted member National annex NB (informative) Cross-references Publication referred to Corresponding British Standard ISO 3923-1:1979 EN 23923-1:1993 BS EN 23923 Metallic powders Determination of apparent density Part 1:1993 Fu
44、nnel 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 Subsection 2.2.3:1984 Oscillating funnel method BS EN 23923-2:1993 ISO3923-2: 1981 BSI 389 Chiswick Hi
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