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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 725-9 : 1997 The Eu
2、ropean Standard EN 725-9 : 1997 has the status of a British Standard ICS 81.060.99 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Advanced technical ceramics Methods of test for ceramic powders Part 9. Determination of untamped bulk density BS EN 725-9 : 1997 This British Sta
3、ndard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 July 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference RPI/13 Draft
4、for comment 93/301338 DC ISBN 0 580 27909 X Amendments issued since publication Amd. No.DateText affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee RPI/13, Advanced technical ceramics, upon which the following bodie
5、s were represented: AEATechnology Aluminium Federation British Ceramic Research Ltd. British Industrial Ceramic Manufacturers Association Department of Trade and Industry (National Physical Laboratory) Flat Glass Manufacturers Association GAMBICA (BEAMA Ltd.) Institute of Refractories Engineers Mini
6、stry of Defence Refractories Association of Great Britain Society of British Aerospace Companies Ltd. University of Manchester BS EN 725-9 : 1997 BSI 1997i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 725-93 ii BSI 1997 BS EN 725-9 : 1997 National f
7、oreword This British Standard has been prepared by Technical Committee RPI/13 and is the English language version of EN 725-9 : 1997 Advanced technical ceramics Methods of test for ceramic powders Part 9: Determination of untamped bulk density, published by the European Committee for Standardization
8、 (CEN). EN 725-9 : 1997 was produced as a result of international discussions in which the United Kingdom took an active part. EN 725-9 : 1997 has been approved by CEN member bodies under the weighted voting procedures introduced in 1988 to coincide with the introduction of New Approach Directives f
9、rom the Commisssion of the European Community. NOTE. International and European Standards as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London, W4 4AL. Compliance with a British Standard does not of itself confer immunity from legal obligations. Su
10、mmary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 4, an inside back cover and a back cover. CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: ru
11、e de Stassart 36, B-1050 Brussels 1997 Copyright reserved to CEN members Ref. No. EN 725-9 : 1997 E EUROPEAN STANDARDEN 725-9 NORME EUROPE ENNE EUROPA ISCHE NORM March 1997 ICS 81.060.99 Descriptors: Ceramics, powdery materials, bulk products, tests, determination, bulk density English version Advan
12、ced technical ceramics Methods of test for ceramic powders Part 9: Determination of untamped bulk density Ce ramiques techniques avance es Me thodes dessai pour poudres ce ramiques Partie 9: De termination de la masse volumique apparente en vrac Hochleistungskeramik Pru fverfahren fu r keramische Pu
13、lver Teil 9: Bestimmung der Schu ttdichte This European Standard was approved by CEN on 1996-12-22. 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-
14、to-date lists and bibliographical 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 unde
15、r the responsibility of a 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, Netherla
16、nds, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Page 2 EN 725-9 : 1997 BSI 1997 Foreword This European Standard has been prepared by Technical Committee CEN/TC 184, Advanced technical ceramics, the secretariat of which is held by BSI. This European Standard shall be given the s
17、tatus of a national standard, either by publication of an identical text or by endorsement, at the latest by September 1997, and conflicting national standards shall be withdrawn at the latest by September 1997. EN 725 consists of 11 parts: Part 1 :Determination of impurities in alumina Part 2 :Dete
18、rmination of impurities in barium titanate (ENV) Part 3 :Determination of oxygen content of non-oxides by thermal extraction Part 4 :Determination of oxygen content of non-oxides by XRF analysis (ENV) Part 5 :Determination of particle size distribution Part 6 :Determination of specific area Part 7 :
19、Determination of absolute density Part 8 :Determination of tapped bulk density Part 9 :Determination of untamped bulk density Part 10 : Determination of compaction properties Part 11 : Determination of reactivity on sintering (ENV) According to the CEN/CENELEC Internal Regulations, the national stan
20、dards organizations of the 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 the United Kingdom. Contents Page Foreword2 1S
21、cope3 2Principle3 3Apparatus3 4Procedure4 5Expression of results4 6Test report4 7Repeatability and reproducibility4 Page 3 EN 725-9 : 1997 BSI 1997 Figure 1. Apparatus 1 Scope This part of EN 725 describes a method for the determination of the untamped bulk density of ceramic powders. 2 Principle Th
22、e mass of a known volume of the powder is determined after allowing it to fall freely into a stationary container, avoiding vibration. The untamped bulk density is expressed by division of this mass by the volume of the container. 3 Apparatus (see figure 1) 3.1 Stainless steel cylindrical container,
23、 of volume approximately 100 cm3and a diameter to height ratio of 1. 3.2 24 mesh (710 mm) sieve, with a typical diameter of 80 mm. 3.3 Balance, with a precision of 0,01 g. 3.4 Tray, to collect the powder during the filling of the container. Page 4 EN 725-9 : 1997 BSI 1997 3.5 Suitable apparatus for
24、the powder sieve assembly, including a fixing system for the sieve with a cone in its lower part to allow the sieve and the cone to be set to a predetermined height above the top level of the cylindrical container (see 3.1), and an electric system to regulate the vibration of the sieve. 4 Procedure
25、4.1 Sample treatment If there is any treatment of the sample of powder before measurement (e.g. drying), this shall be recorded in the test report. 4.2 Measurement Weigh the cylindrical container (see 3.1). Set the cylindrical container in the tray (see 3.4) so that its axis coincides with that of t
26、he cone, with the level of the sieve at a height of 190 mm above the cylindrical container top. Fill the sieve with the sample. If necessary start the vibration system (see 3.5) and regulate it to allow the powder to flow evenly. Fill the cylindrical container in between 20 s and 30 s. Stop the feed
27、 when the powder has formed a cone above the top of the cylindrical container and is spilling over. Remove the cone of surplus powder by gently drawing a straight edge across the top rim of the cylindrical container, without communicating any vibration to the latter. Weigh the cylindrical container
28、and its contents. 5 Expression of results The untamped bulk density rbis given by the formula rb= m12 m0 V where mois the mass, in grams, of the empty cylindrical container; m1is the mass, in grams, of the cylindrical container full of powder; Vis the volume, in cubic centimetres, of the cylindrical
29、 container. Calculate the density in grams per cubic centimetre and then convert the answer to kilograms per cubic metre, to the nearest 5 kg/m3. 6 Test report The test report shall include the following information: a) the name of the testing establishment; b) date of the test, report identificatio
30、n and number, operator, signatory; c) a reference to this standard, i.e. determined in accordance with EN 725-9; d) a description of the powder (material type, manufacturer code, batch or code number); e) any pre-treatment of the powder such as drying; f) the results; g) any unusual features noted d
31、uring the determination; h) any comments about the test or test results. 7 Repeatability and reproducibility The experience of three laboratories indicates that the method is capable, for an alumina powder with an untamped bulk density of 909 kg/m3, of achieving: a) a standard deviation of repeatabi
32、lity of 7 kg/m3; b) a standard deviation of reproducibility of 9 kg/m3. blank BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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