1、BRITISH STANDARDBS EN 725-9:2006Advanced technical ceramics Methods of test for ceramic powders Part 9: Determination of un-tapped bulk densityThe European Standard EN 725-9:2006 has the status of a British StandardICS 81.060.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g
2、53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 725-9:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 16 March 2006 BSI 16 March 2006ISBN 0 580 47964 1N
3、ational forewordThis British Standard is the official English language version of EN 725-9:2006. It supersedes BS EN 725-9:1997 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics, which has the responsibility to: A list
4、 of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards
5、Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does
6、not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European development
7、s and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. D
8、ate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 725-9March 2006ICS 81.060.30 Supersedes EN 725-9:1997 English VersionAdvanced technical ceramics - Methods of test for ceramicpowders - Part 9: Determination of un-tapped bulk densityCramiques techniques avances - Mthodes dessai pourpoudr
9、es cramiques - Partie 9: Dtermination de la massevolumique en vracHochleistungskeramik - Prfverfahren fr keramischePulver - Teil 9: Bestimmung der SchttdichteThis European Standard was approved by CEN on 3 February 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
10、stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard
11、exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bo
12、dies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMI
13、TTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 725-9:2006: EEN 725-9:2006 (E) 2 Contents
14、 Page Foreword.3 1 Scope5 2 Normative references5 3 Principle .5 4 Apparatus.5 5 Procedure.5 5.1 Sample treatment 5 5.2 Measurement .6 6 Expression of results 6 7 Test report6 Annex A (informative) Repeatability and reproducibility .9 EN 725-9:2006 (E) 3 Foreword This European Standard (EN 725-9:200
15、6) 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 status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2006, and c
16、onflicting national standards shall be withdrawn at the latest by September 2006. This European Standard supersedes EN 725-9:1997. The main changes in the new edition are: - revision of the Foreword to reflect changes in the EN 725 series; - addition of normative references; - modifications to the a
17、pparatus specification; - modifications to the test report requirements. EN 725 Advanced technical ceramics Methods of test for ceramic powders was prepared in Parts as follows: Part 1 Determination of impurities in alumina Part 2 Determination of impurities in barium titanate Part 3 Determination o
18、f oxygen content of non-oxides by thermal extraction with a carrier gas Part 4 Determination of oxygen content in aluminium nitride by XRF analysis Part 5 Determination of particle size distribution Part 6 Determination of specific surface area withdrawn Part 7 Determination of absolute density with
19、drawn Part 8 Determination of tapped bulk density Part 9 Determination of un-tapped bulk density Part 10 Determination of compaction properties Part 11 Determination of densification on natural sintering Part 12 Chemical analysis of zirconia Parts 6 and 7 of the series were superseded in 2005 by EN
20、ISO 18757 and EN ISO 18753 respectively. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech EN 725-9:2006 (E) 4 Republic, Denmark, Estonia, Finland, France,
21、Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 725-9:2006 (E) 5 1 Scope This European Standard specifies a method for the determination of t
22、he un-tapped bulk density of granulated or un-granulated ceramic powders. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the
23、 referenced document (including any amendments) applies. EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:2005) ISO 565, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings 3 Principle
24、The mass of a known volume of the powder is determined after allowing it to fall freely into a stationary container, avoiding vibration. The un-tapped bulk density is expressed by division of this mass by the volume of the container. 4 Apparatus 4.1 Stainless steel cylindrical container (see Figure
25、1) of volume approximately 100 cm3and a diameter to height ratio in the range 0,9 to 1,1. The exact volume of the container shall be measured to the nearest 0,2 cm3. 4.2 Sieve, with an aperture size of 710 m as specified in ISO 565 and with a typical diameter of 80 mm. 4.3 Balance with a resolution
26、of 0,01 g. 4.4 Tray, to collect the powder during the filling of the container. 4.5 Suitable assembly for allowing the powder to flow and fill the container (4.1) evenly, including a fixing system for the sieve (4.2) with a cone in its lower part to allow the sieve and the cone to be set to a predet
27、ermined height above the top level of the container, and a system to regulate the vibration of the sieve (see Figure 1). 5 Procedure 5.1 Sample treatment If there is any treatment of the sample before measurement (e.g. drying), this shall be recorded in the test report. EN 725-9:2006 (E) 6 5.2 Measu
28、rement Weigh the cylindrical container (4.1). Set the cylindrical container in the tray (4.4) so that its axis coincides with that of the 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 syst
29、em (4.5) and regulate it to allow the powder to flow evenly. Fill the cylindrical container in between 20 s and 30 s. Stop the feed 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 a
30、cross the top rim of the cylindrical container, without communicating any vibration to the latter. Weigh the cylindrical container and its contents. 6 Expression of results The un-tapped bulk density bis given by the following equation: 10bmmV= (1) where m0is the mass, in grams, of the empty cylindr
31、ical container; m1is the mass, in grams, of the cylindrical container full of powder; V is the volume, in cubic centimetres, of the cylindrical 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. Information
32、 on the probable repeatability and reproducibility of results is given in Annex A. 7 Test report The test report shall be in accordance with the reporting provisions of EN ISO/IEC 17025, and shall include at least the following information: a) name and address of the testing establishment; b) date o
33、f the test; c) on each page, a unique report identification and page number; d) customer name and address; e) reference to this European Standard, i.e. determined in accordance with EN 725-9; f) authorising signature; g) any deviation from the method described, with appropriate validation, i.e. demo
34、nstrated to be acceptable to the parties involved; h) description of the powder (e.g. material type, manufacturer code, batch or code number); EN 725-9:2006 (E) 7 i) any pre-treatment of the powder such as drying; j) results; k) any unusual features noted during the determination; l) any comments ab
35、out the test or test results. EN 725-9:2006 (E) 8 Dimensions in millimetres 75506519055502341Key 1 710 m sieve 3 Stainless steel cylindrical container 2 Vibrating system 4 Tray to collect powder Figure 1 Apparatus EN 725-9:2006 (E) 9 Annex A (informative) Repeatability and reproducibility The experi
36、ence of three laboratories indicates that, for an alumina powder with an un-tapped bulk density of 909 kg/m3, the method is capable of achieving: a) standard deviation of repeatability of 7 kg/m; b) standard deviation of reproducibility of 9 kg/m. BS EN 725-9:2006BSI389 Chiswick High RoadLondonW4 4A
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