EN 23923-2-1993 en Metallic Powders - Determination of Apparent Density - Part 2 Scott Volumeter Method《金属粉末 表观密度的测定 第2部分 斯科特(Scott)容积计法(ISO 3923-2-1981)》.pdf

1、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 version Metallic powders - Determination of apparent density - Part 2 : Scott volumeter method (IS0

2、 3923-2 : 1981) Poudres mtalliques - Dtermination de la masse volumique apparente - Metallpulver - Ermittlung der Fulldichte - %il 2: Scott-Volumeter-Verfahren Partie 2: Mthode du volumtre de Scott (IS0 3923-2 1981) (IS0 3923-2 : 1981) This European Standard was approved by CEN on 1993-04-02. CEN me

3、mbers are bound to comply with the CENKENELEC 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 applicat

4、ion 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 the

5、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 Standardiz

6、ation Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1993 Copyright reserved to CEN members Ref. No. EN 23923-2 : 1993 E CEN ENx23923-2 93 W 3Y0459 OOY7OLO T5L W Page 2 EN 23923-2 : 1993 Foreword In 1992, IS0 3923-2 : 1981 Met

7、allic powders - Detmmination of apparent density - Part 2: Scott volumeter method was submitted to the CEN Primary Questionnaire procedure. Following the positive result of the CENCS Proposal IS0 3923-2 : 1981 was submitted to the CEN Formal Vote. The result of the Formal Vote was positive. This Eur

8、opean 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of an identical text or by endorsement, at the latest by October 1993, and conflicting national standards shall be withdrawn at the latest by October 1993. According to the Internal Regulations of CENKENELEC, the

9、following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and IJnited Kingdom. NUE. The European references to international publicatio

10、ns are given in annex ZA (normative). CEN EN*w23923-2 93 3404589 004701L 998 D Page 3 EN 23923-2 : 1993 Metallic powders - Determination of apparent density - Part 2 : Scott volumeter method 1 Scope and field of application This part of IS0 3923 specifies the Scott volumeter method for the determina

11、tion of the apparent density of metallic powders. It is applicable to powders that will not flow freely through a 5 mm orifice see IS0 393/1). Part 3 of this International Standard specifies the oscillating funnel method for the determination of apparent density of such powders, and this is preferre

12、d since it gives better preci- sion, 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 IS0 39231 1, Metallic powders - Determination of apparent density - Part 1 : Funnei method. IS0 392313, Metall

13、ic 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 condition is obtained, when filling the cup, by cascading the powder over

14、 a series of inclined plates in a Scott volumeter see figures 1 and 2). The ratio between the mass and the volume represents the ap- parent density. 4 Symbols and designations Designation I Unit I as m V . Apparent density of metallic powders (general term) Apparent density obtained by the Scott vol

15、umeter method Mass of the powder 9 Volume of the CUD I cm3 I 5 Apparatus 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,

16、and containing four glass baffles which may be located and retained 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

17、 powder. It is im- portant that none of the powder can pass between the 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 s

18、hown in figures 1 and 2. Dimensions given with tolerances are mandatory. 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,

19、box and funnel coaxially at the heights indicated in the figures. 5.2 and an internal diameter of 30 k 1 mm. Cylindrical cup, having a capacity of 25 $- 0,05 cm3 NOTE - The cup and funnels should be made of nonmagnetic, corrosion-resistant metallic material having sufficient wall thickness and hardn

20、ess to avoid distortion and excessive wear. The inner sur- faces of the cup and funnels should be polished. 5.3 an accuracy of f 0,05 g. Balance, of sufficient capacity, permitting weighing to 6 Sampling 6.1 The test sample shall be of at least 100 cm3 volume to allow the determination to be carried

21、 out on three test portions. CEN ENu23923-2 93 m 3404589 0047012 824 m Page 4 EN 23923-2 : 1993 6.2 In general the powder should be tested in 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 va

22、cuum or in inert gas. If the powder con- tains volatile substances it shall not be dried. 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 flowing, its passage through the s

23、ieve may be aided by light brushing with a soft brush. NOTE - If light brushing is not sufficient to make the powder flow through the sieve, the Scott vdumeter 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 t

24、o 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 nearest 0,05 g. Carry out the determin

25、ations 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 nearest 0.01 g/cd, and the highest and the lowest results if the scatter between results exceeds 1 % of the mean. 9 Test report The test rep

26、ort 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 this International Stan- da

27、rd, or regarded as optional; f) details of any occurrence which may have affected the result. CEN ENr23923-2 73 3404587 0047033 760 9 Page 5 EN 23923-2 : 1993 Dimensions in millimetres Large funnel 1 I Small funnel : Figure 1 - Test apparatus - Front view Page 6 EN 23923-2 : 1993 Glass CEN ENu23923-

28、2 93 m 3404589 0047014 bT7 m Dimensions in millimetres side G t Lower cross member Lower square funnel 7 - Wooden side 1 Figure 2 - Test apparatus - Side view CEN ENr23923-2 93 3404589 00470L5 533 Page 7 EN 23923-2 : 1993 Annex ZA (normative) Normative references to international publications with t

29、heir 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 hereafter. For dated references, subsequent amendments

30、 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 Year Title EN/HD Year IS0 3923-1 Metallic powders - Determination of apparent EN 23923-1 density - Part 1 : Funnel method IS0 3923-3 Metallic powders - Determination of apparent EN 23923-3 density - Part 3: Oscillating funnel method