BS EN ISO 3923-1-2010 Metallic powders - Determination of apparent density - Funnel method《金属粉末 表观密度测定 漏斗法》.pdf

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1、BS EN ISO3923-1:2010ICS 77.160NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDMetallic powders Determination ofapparent densityPart 1: Funnel method (ISO3923-1:2008)This British Standardwas published under theauthority of the StandardsPolicy and StrategyCommitte

2、e on 31 May 2010 BSI 2010ISBN 978 0 580 69470 7Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 3923-1:2010National forewordThis British Standard is the UK implementation of EN ISO 3923-1:2010.It is identical to ISO 3923-1:2008. It supersedes BS EN 23923-1:1993which is withdrawn.

3、The UK participation in its preparation was entrusted to TechnicalCommittee ISE/65, Sintered metal components.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users

4、 are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3923-1 April 2010 ICS 77.160 Supersedes EN 23923-1:1993English Version Metallic powders - Determination of apparent de

5、nsity - Part 1: Funnel method (ISO 3923-1:2008) Poudres mtalliques - Dtermination de la masse volumique apparente - Partie 1: Mthode de lentonnoir (ISO 3923-1:2008) Metallpulver - Ermittlung der Flldichte - Teil 1: Trichterverfahren (ISO 3923-1:2008) This European Standard was approved by CEN on 16

6、April 2010. 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 o

7、btained on application to the CEN Management Centre 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 CEN Man

8、agement Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Nethe

9、rlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation

10、in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3923-1:2010: EBS EN ISO 3923-1:2010EN ISO 3923-1:2010 (E) 3 Foreword The text of ISO 3923-1:2008 has been prepared by Technical Committee ISO/TC 119 “Powder metallurgy” of the International Organization for Sta

11、ndardization (ISO) and has been taken over as EN ISO 3923-1:2010. 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 2010, and conflicting national standards shall be withdrawn at the latest

12、by October 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 23923-1:1993. According to the CEN/CENELE

13、C Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

14、 Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 3923-1:2008 has been approved by CEN as a EN ISO 3923-1:2010 without any modification. BS EN ISO 3923-1:2010ISO 3923-1:2008(E)

15、 ISO 2008 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Symbols and designation 1 5 Apparatus 2 6 Sample . 4 7 Procedure 4 8 Expression of results . 5 9 Precision 5 9.1 Repeatability 5 9.2 Reproducibility 5 10 Test report . 5 BS EN ISO 3923-

16、1:2010ISO 3923-1:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees

17、. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Intern

18、ational Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Sta

19、ndards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subj

20、ect of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3923-1 was prepared by Technical Committee ISO/TC 119, Powder metallurgy, Subcommittee SC 2, Sampling and testing methods for powders (including powders for hardmetals). This third edition canc

21、els and replaces the second edition (ISO 3923-1:1979), which has been technically revised. ISO 3923 consists of the following parts, under the general title Metallic powders Determination of apparent density: Part 1: Funnel method Part 2: Scott volumeter method BS EN ISO 3923-1:2010INTERNATIONAL STA

22、NDARD ISO 3923-1:2008(E) ISO 2008 All rights reserved 1Metallic powders Determination of apparent density Part 1: Funnel method 1 Scope This part of ISO 3923 specifies the funnel method for the determination of the apparent density of metallic powders under standardized conditions. The method is int

23、ended for metallic powders that flow freely through a 2,5 mm diameter orifice. It may, however, be used for powders that flow with difficulty through a 2,5 mm diameter orifice but flow through a 5 mm diameter orifice. Methods for the determination of the apparent density of powders that will not flo

24、w through a 5 mm diameter orifice are specified in ISO 3923-2. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document

25、 (including any amendments) applies. ISO 3923-2, Metallic powders Determination of apparent density Part 2: Scott volumeter 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 by u

26、sing, when filling the cup, a funnel placed at a determined distance above the cup. The ratio between the mass and the volume represents the apparent density. 4 Symbols and designation The symbols and designations used in this International Standard are defined in Table 1. Table 1 Symbol Designation

27、 Unit aApparent density of metallic powders (General term) g/cm3acApparent density obtained by the funnel method g/cm3m Mass of the powder g V Volume of the cup cm3BS EN ISO 3923-1:2010ISO 3923-1:2008(E) 2 ISO 2008 All rights reserved5 Apparatus 5.1 Funnels, one having an orifice of diameter 2,5 mm

28、and the other an orifice of diameter 5 mm; see Figures 1 and 2, respectively. 5.2 Cylindrical cup, having a capacity of 25 cm3 0,03 cm3and an internal diameter of 28 mm 0,5 mm. A cup with the same capacity and with an internal diameter of 30 mm 1 mm is also acceptable. 28 mm 0,5 mm is however the fi

29、rst option when new equipment is manufactured. The cup and funnels should be made of a 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,

30、 of sufficient capacity, capable of weighing the test sample to an accuracy of 0,01 g. 5.4 Stand and horizontal vibration-free base, to support the cup and funnel, the stand holding the orifice of the funnel 25 mm above the top surface of the cup and coaxially with it; see Figure 3. Dimensions in mi

31、llimetres Key aThis value is mandatory. bD = 0,202,5+Figure 1 Funnel with orifice diameter 2,5 mm BS EN ISO 3923-1:2010ISO 3923-1:2008(E) ISO 2008 All rights reserved 3Dimensions in millimetres Key aThis value is mandatory. bD = 0,205+Figure 2 Funnel with orifice diameter 5 mm BS EN ISO 3923-1:2010I

32、SO 3923-1:2008(E) 4 ISO 2008 All rights reservedDimensions in millimetres Key aA cup with the same capacity and with an internal diameter of 30 mm 1 mm is also acceptable (see 5.2). Figure 3 Arrangement of the stand with funnel and cup 6 Sample 6.1 The test sample shall be of at least 100 cm3in volu

33、me 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 powder may be dried. However, if the powder is susceptible to oxidation, the drying shall take place in a vacuum or in an inert

34、gas. If the powder contains volatile substances, it shall not be dried. 7 Procedure 7.1 Pour the test portion of powder into the funnel with the 2,5 mm orifice and, from that, directly into the cylindrical cup, until this is completely filled and the powder flows over. Level the powder in one operat

35、ion with a non-magnetic straight-edge without compressing it, and take care not to jar or vibrate the cup. 7.2 If the powder does not flow through this funnel, use the funnel with the 5 mm orifice. If the powder still does not flow, it is allowable to initiate flow by poking once with a 1 mm wire fr

36、om the top of the funnel. The wire shall not enter the cup. 7.3 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. 7.4 Determine the mass of the powder to the nearest

37、 0,01 g. 7.5 Carry out the determinations on three test portions. BS EN ISO 3923-1:2010ISO 3923-1:2008(E) ISO 2008 All rights reserved 58 Expression of results The apparent density is given by the formula ac25mmV = Report the arithmetical mean of the three determinations to the nearest 0,01 g/cm3, a

38、nd also the highest and lowest results if the scatter between results exceeds 1 % of the mean. 9 Precision 9.1 Repeatability Duplicated tests with the same equipment, by the same operator, on a homogenized batch of powder, should be considered suspect if they differ by more than 0,03 g/cm3at a 95 %

39、confidence level. 9.2 Reproducibility Results from two different laboratories, on the same homogenized batch of powder, should be considered suspect if they differ by more than 0,05 g/cm3at a 95 % confidence level. 10 Test report The test report shall include the following information: a) a referenc

40、e to this part of ISO 3923; b) all details necessary for the identification of the test sample; c) the drying procedure, if the powder has been dried; d) the nominal diameter of the orifice and the use of a wire, if applied; e) the result obtained; f) all operations not specified in this part of ISO

41、 3923, or regarded as optional; g) details of any occurrence which may have affected the result. BS EN ISO3923-1:2010BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 - British Standards InstitutionBSI is the independent national body responsibl

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