BS ISO 18549-1-2009 Metallic powders - Determination of apparent density and flow rate at elevated temperatures - Determination of apparent density at elevated temperatures《金属粉末 在高.pdf

1、BS ISO18549-1:2009ICS 77.160NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDMetallic powders Determination ofapparent density andflow rate at elevatedtemperaturesPart 1: Determination of apparentdensity at elevated temperaturesThis British Standardwas published

2、under theauthority of the StandardsPolicy and StrategyCommittee on 31 October2009 BSI 2009ISBN 978 0 580 58096 3Amendments/corrigenda issued since publicationDate CommentsBS ISO 18549-1:2009National forewordThis British Standard is the UK implementation of ISO 18549-1:2009.The UK participation in it

3、s 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 are responsible for its c

4、orrect application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS ISO 18549-1:2009Reference numberISO 18549-1:2009(E)ISO 2009INTERNATIONAL STANDARD ISO18549-1First edition2009-04-15Metallic powders Determination of apparent density and flow rate at elevated temper

5、atures Part 1: Determination of apparent density at elevated temperatures Poudres mtalliques Dtermination de la masse volumique apparente et de la vitesse dcoulement tempratures leves Partie 1: Dtermination de la masse volumique apparente tempratures leves BS ISO 18549-1:2009ISO 18549-1:2009(E) PDF

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10、Os member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedBS ISO 18549-1:2009ISO 18549-1:2009(E) ISO 2009 All righ

11、ts reserved iiiForeword 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. Each member body interested in a subjec

12、t 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 International Electrotechnical Commission (IEC)

13、 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 Standards adopted by the technical committee

14、s 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 subject of patent rights. ISO shall not be he

15、ld responsible for identifying any or all such patent rights. ISO 18549-1 was prepared by Technical Committee ISO/TC 119, Powder metallurgy, Subcommittee SC 2, Sampling and testing methods for powders (including powders for hardmetals). ISO 18549 consists of the following parts, under the general ti

16、tle Metallic powders Determination of apparent density and flow rate at elevated temperatures: Part 1: Determination of apparent density at elevated temperatures Part 2: Determination of flow rate at elevated temperatures BS ISO 18549-1:2009BS ISO 18549-1:2009INTERNATIONAL STANDARD ISO 18549-1:2009(

17、E) ISO 2009 All rights reserved 1Metallic powders Determination of apparent density and flow rate at elevated temperatures Part 1: Determination of apparent density at elevated temperatures 1 Scope This part of ISO 18549 describes a method for the determination of apparent density at elevated temper

18、atures for powder mixes, based on iron or steel powders and intended for warm compaction. The method is, to a large extent, based on the apparent density method (funnel method) standardized in ISO 3923-1, but either of the two funnels that are mentioned can be selected after agreement between the pa

19、rties involved. 2 Apparatus 2.1 Thermally insulated enclosure, where the actual measurement shall take place. 2.2 Funnel with an orifice diameter of 2,5 mm or, alternatively, a funnel with an orifice diameter of 5 mm, see Figure 1 or 2, respectively. 2.3 Cylindrical cup, with a capacity of 25 0,03 c

20、m3and an internal diameter of 28 0,5 mm. A cup with the same capacity and with an internal diameter of 30 1 mm is also acceptable. However, 28 0,5 mm is the first option when new equipment is manufactured. The cup and funnel should be made of non-magnetic, corrosion-resistant, metallic material havi

21、ng sufficient wall thickness and hardness to avoid distortion and excessive wear. The inner surfaces of the funnel and cup should be polished. 2.4 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 cu

22、p and coaxially with it, see Figure 3. 2.5 Devices for heating the funnel, e.g. an electrical band heater, and the cylindrical cup, e.g. a cartridge heater, to the selected and agreed temperature for the powder mix within the range 60 C to 180 C, with a maximum allowed variation of 2,5 C. 2.6 Labora

23、tory furnace, for heating the powder sample to the selected and agreed temperature within the range 60 C to 180 C. 2.7 Thermocouples, sufficient to adjust and control the temperatures of the powder mix and the equipment within 2,5 C of the selected temperature. 2.8 Balance, with a capacity of at lea

24、st 200 g, capable of weighing the test sample to an accuracy of 0,01 g. NOTE An example of the insulated enclosure containing the funnel, stand and cup is shown in Figure 4. BS ISO 18549-1:2009ISO 18549-1:2009(E) 2 ISO 2009 All rights reservedDimensions in millimetres Dimensions in millimetresKey 1

25、polished to Ra u 0,4 m athis value is mandatory bD = 0,202,5+Key 1 polished to Ra u 0,4 m athis value is mandatory bD = 0,205+Figure 1 Funnel with orifice diameter of 2,5 mm Figure 2 Funnel with orifice diameter of 5 mm BS ISO 18549-1:2009ISO 18549-1:2009(E) ISO 2009 All rights reserved 3Dimensions

26、in millimetres Key 1 heating device, e.g. band heater 2 heating device aa cup with the same capacity and with an internal diameter of 30 mm 1 mm is also acceptable (see 2.3) Figure 3 Arrangement of the stand with funnel and cup, including heating devices Figure 4 Example of the insulated enclosure c

27、ontaining the funnel, stand and cup BS ISO 18549-1:2009ISO 18549-1:2009(E) 4 ISO 2009 All rights reserved3 Test sample 3.1 The test sample shall have a volume of at least 100 cm3to allow the determination of two or three test portions. 3.2 The test sample shall be heated in the laboratory furnace se

28、t at the selected temperature for the mix in question in the range 60 C to 180 C, to make sure that a homogeneous temperature of the powder can be kept within 2,5 C. 4 Procedure It is recommended to have the balance tared for the empty cylindrical cup before starting the determination. 4.1 Heat the

29、test portion of the mix to the selected target temperature. Carefully load it into the flowmeter funnel as fast as possible to avoid cooling. Allow the powder to flow through the orifice into the density cup. Take care not to move the density cup. 4.2 When the powder completely fills and overflows t

30、he periphery of the density cup, rotate the funnel approximately 90 in a horizontal plane so that the remaining powder in the funnel falls away from the cup. 4.3 Level the powder with the top of the density cup using a non-magnetic spatula or straight-edge held perpendicular to the top of the cup. T

31、ake care to avoid jarring the apparatus at any time. 4.4 After the levelling operation, lightly tap the side of the density cup to settle the powder to avoid spilling the powder when moving the cup. 4.5 Weigh the filled density cup to the nearest 0,01 g. It is very important to minimize heat losses.

32、 Therefore, the heated test portions must be transferred quickly to the thermally insulated enclosure. WARNING Both the powder and equipment are warm. The operation must therefore be carried out with care. 5 Result The mass, in grams, of the powder in the levelled density cup shall be divided by the

33、 volume of the cup (25 cm3). Report the arithmetical mean of the two or three determinations to the nearest 0,01 g/cm3. 6 Test report The test report shall include the following information: a) a reference to this part of ISO 18549; b) all details necessary for the identification of the test sample;

34、 c) the nominal diameter of the orifice; d) the testing temperature used for the powder sample and funnel; e) the result obtained, and how many determinations it is based on; f) all operations not specified in this part of ISO 18549 or regarded as optional. BS ISO 18549-1:2009ISO 18549-1:2009(E) ISO

35、 2009 All rights reserved 5Bibliography 1 ISO 3923-1:2008, Metallic powders Determination of apparent density Part 1: Funnel method BS ISO 18549-1:2009ISO 18549-1:2009(E) ICS 77.160 Price based on 5 pages ISO 2009 All rights reserved BS ISO 18549-1:2009This page has been intentionally left blank BS

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