1、BRITISH STANDARDBS EN 725-8:2006Advanced technical ceramics Methods of test for ceramic powders Part 8: Determination of tapped bulk densityThe European Standard EN 725-8:2006 has the status of a British StandardICS 81.060.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g
2、48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIBS EN 725-8:2006This British Standard was published under the authority of the Standards P
3、olicy and Strategy Committee on 28 April 2006 BSI 2006ISBN 0 580 48175 1National forewordThis British Standard is the official English language version of EN 725-8:2006. It supersedes BS EN 725-8:1997 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee RPI
4、/13, Advanced technical ceramics, which has the responsibility to: A list 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
5、in the BSI Catalogue under the section entitled “International Standards 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 responsi
6、ble for its correct application. Compliance with a British Standard does 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 i
7、nterests informed; monitor related international and European developments 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 10, an inside back cover and a back cover.The BSI copyright notice displayed in this do
8、cument indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 725-8March 2006ICS 81.060.30 Supersedes EN 725-8:1997 Eng
9、lish VersionAdvanced technical ceramics - Methods of test for ceramicpowders - Part 8: Determination of tapped bulk densityCramiques techniques avances - Mthodes dessai pourpoudres cramiques - Partie 8: Dtermination de la massevolumique aprs tassementHochleistungskeramik - Prfverfahren fr keramische
10、Pulver - Teil 8: Bestimmung der geklopften SchttdichteThis European Standard was approved by CEN on 3 February 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any
11、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 exists in three official versions (English, French, German). A version in any other language made by tra
12、nslationunder 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 bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hun
13、gary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: r
14、ue 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 725-8:2006: ELicensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIEN 725-8:2006 (E) 2 Contents Page Foreword.3 1
15、Scope5 2 Normative references5 3 Principle .5 4 Apparatus.5 5 Procedure.6 5.1 Sample treatment 6 5.2 Measurement .6 6 Expression of results 6 7 Test report6 Annex A (informative) Repeatability and reproducibility .10 Licensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) B
16、SIEN 725-8:2006 (E) 3 Foreword This European Standard (EN 725-8:2006) 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 ident
17、ical text or by endorsement, at the latest by September 2006, and conflicting national standards shall be withdrawn at the latest by September 2006. This European Standard supersedes EN 725-8:1997. The main changes in the new edition are: - revision of the Foreword to reflect changes in the EN 725 s
18、eries; - addition of normative references; - modifications to the apparatus 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:
19、Determination of impurities in barium titanate Part 3: Determination of 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 speci
20、fic surface area withdrawn Part 7: Determination of absolute density withdrawn 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 a
21、nalysis of zirconia Parts 6 and 7 of the series were superseded in 2005 by EN 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, C
22、yprus, Czech Licensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIEN 725-8:2006 (E) 4 Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
23、Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIEN 725-8:2006 (E) 5 1 Scope This European Standard specifies a method for the determination of the tapped bulk density of granulated or un-granulate
24、d 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 referenced document (including any amendments) applies
25、. 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 The mass of a known volume of the powder is determined
26、after it has been allowed to fall freely into a stationary container and then tapped under specified conditions. The 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 1) of volume approximately
27、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 of 0,01 g. 4.4 Tray, to col
28、lect 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 predetermined height above the to
29、p level of the ring (4.6), and a system to regulate the vibration of the sieve (see Figure 1). 4.6 Ring, height 50 mm (see Figure 1), which can be fitted to the top of the stainless steel cylindrical container to increase its height. 4.7 Tapping system, which permits the tapping of the cylinder and
30、its ring. The stroke shall be 20 mm and the tapping frequency shall be 50 taps/min (see Figure 2). Licensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIEN 725-8:2006 (E) 6 5 Procedure 5.1 Sample treatment If there is any treatment of the sample before measurement (e.g
31、. drying), this shall be recorded in the test report. 5.2 Measurement Weigh the cylindrical container (4.1). Place the ring (4.6) on the top of the cylindrical container. Set the cylindrical container with its ring in the tray (4.4) so that its axis coincides with that of the cone, with the level of
32、 the sieve at a height of 190 mm above the top of the container. Fill the sieve with the sample. If necessary start the vibration system (4.5) and regulate it to allow the powder to flow evenly. Fill the cylindrical container and its ring in between 40 s and 60 s. Stop the feed when the powder has f
33、ormed a cone above the top of the ring and is spilling over. Place the cylindrical container with its ring, filled with the powder, on the tapping device. Start the tapping at a rate of 50 taps/min and maintain for 180 s. Remove the cylindrical container and its ring from the tapping device without
34、vibration. Carefully remove the ring from the cylindrical container. 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 and its contents. 6 Expression
35、of results The tapped bulk density tapis given by the following equation: Vmmtap01= (1) where mois the mass, in grams, of the empty cylindrical container; m1is the mass, in grams, of the cylindrical container full of powder after tapping; V is the volume, in cubic centimetres, of the cylindrical con
36、tainer. Calculate the density in grams per cubic centimetre and then convert the answer to kilograms per cubic metre, to the nearest 5 kg/m. Information 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 rep
37、orting provisions of EN ISO/IEC 17025 and shall include at least the following information: a) name and address of the testing establishment; b) date of the test; Licensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIEN 725-8:2006 (E) 7 c) on each page, a unique report
38、 identification and page number; d) customer name and address; e) reference to this European Standard, i.e. determined in accordance with EN 725-8; f) authorising signature; g) any deviation from the method described, with appropriate validation, i.e. demonstrated to be acceptable to the parties inv
39、olved; h) description of the powder (e.g. material type, manufacturer code, batch or code number); i) any pre-treatment of the powder such as drying; j) results; k) any unusual features noted during the determination; l) any comments about the test or test results. Licensed Copy: Wang Bin, na, Fri J
40、ul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIEN 725-8:2006 (E) 8 Dimensions in millimetres 755065190555023451Key 1 710 m sieve 4 Stainless steel cylindrical container 2 Vibrating system 5 Tray to collect powder 3 Ring h 50 mm Figure 1 Apparatus Licensed Copy: Wang Bin, na, Fri Jul 14 04:04:32
41、BST 2006, Uncontrolled Copy, (c) BSIEN 725-8:2006 (E) 9 20124563Key 1 Ring 4 Piston 2 Cylindrical container 5 Guide bearing 3 Tapping stroke 6 Cam Figure 2 Example of tapping system Licensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIEN 725-8:2006 (E) 10 Annex A (inf
42、ormative) Repeatability and reproducibility The experience of three laboratories indicates that, for an alumina powder with a tapped bulk density of 1 526 kg/m, the method is capable of achieving: a) a standard deviation of repeatability of 8 kg/m; b) a standard deviation of reproducibility of 13 kg
43、/m. Licensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIblankLicensed Copy: Wang Bin, na, Fri Jul 14 04:04:32 BST 2006, Uncontrolled Copy, (c) BSIBS EN 725-8:2006BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national bod
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