1、BRITISH STANDARDBS ISO 17352:2008Hardmetals Determination of silicon in cobalt metal powders using graphite-furnace atomic absorptionICS 77.160g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37
2、g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS ISO 17352:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2008 BSI 2008ISBN 978 0 580 56323 2National forewordThis British Standard is the UK implementation of ISO 17352:2008. The UK p
3、articipation in its preparation was entrusted to Technical Committee ISE/65, Sintered metal components.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are
4、responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsReference numberISO 17352:2008(E)INTERNATIONAL STANDARD ISO17352Second edition2008-06-01Hardmetals Determination of sili
5、con in cobalt metal powders using graphite-furnace atomic absorption Mtaux durs Dosage du silicium dans les poudres mtalliques de cobalt par absorption atomique four graphite BS ISO 17352:2008ii iiiContents Page Foreword iv 1 Scope . 1 2 Principle. 1 3 Reagents 1 4 Apparatus 2 5 Procedure 2 6 Calibr
6、ation . 2 7 Calculation. 2 8 Precision 2 9 Test report . 3 Bibliography . 4 BS ISO 17352:2008iv Foreword 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 carr
7、ied out through ISO technical committees. 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.
8、ISO collaborates closely with the International 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 Internat
9、ional Standards. Draft International Standards 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 e
10、lements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17352 was prepared by Technical Committee ISO/TC 119, Powder metallurgy, Subcommittee SC 4, Sampling and testing methods for hardmetals. BS ISO 17352:200
11、81Hardmetals Determination of silicon in cobalt metal powders using graphite-furnace atomic absorption 1 Scope This International Standard specifies a test method, using graphite-furnace atomic absorption, to determine the mass fraction of silicon in cobalt metal powder with varying compositions wit
12、hin the range of 5 g/g to 40 g/g. 2 Principle This test method for the chemical analysis of cobalt metal powder is to be used to determine traces of silicon. It is assumed that all those who use this test method will be trained analysts capable of performing common laboratory procedures skilfully an
13、d safely. It is expected that all the work will be performed in a properly equipped laboratory. 3 Reagents Reagents of the highest purity and only double-distilled water or their equivalents shall be used. 3.1 Nitric acid, = 1,4 g/ml. 3.2 Hydrochloric acid, = 1,15 g/ml. 3.3 Cobalt powder, purity 99,
14、9 % by mass. 3.4 Si solution, 1,000 g/l. BS ISO 17352:20082 4 Apparatus 4.1 Graphite-furnace atomic absorption spectrometer Follow the manufacturers instruction manual for installation and operation. 4.2 Additional information The following parameters are for information purposes only and have to be
15、 adapted to the special requirements of every laboratory. Lamp: hollow cathode lamp for Si Tube: coated pyrolytic C-tube without a platform Wavelength: 251,6 nm Slit: 0,2 nmInjection volume: 20 l Temperature program: drying 120 C ashing 1 200 C atomising 2 700 C conditioning 2 750 C 5 Procedure 5.1
16、Test portion Weigh, to the nearest 0,001 g, approximately 0,5 g of the test sample and transfer it to a 100 ml polypropylene flask. 5.2 Dissolution of the test portion The test sample is dissolved in 10 ml of nitric acid and 2 ml of hydrochloric acid. When the sample is completely dissolved, allow t
17、he flask to cool and then fill up to 100 ml with double-distilled water. 6 Calibration 0,500 g of ultrapure cobalt powder is dissolved in the same way as the test sample (see 5.2). The resulting solutions are spiked with 0 g of Si, 5 g of Si, 10 g of Si, 20 g of Si and 40 g of Si and filled up to 10
18、0 ml with water. With these calibrated solutions, a calibration curve is prepared. 7 Calculation Calculate the mass fraction of silicon in the sample using the calibration curve prepared in Clause 6. Compensate for the actual weight of the sample analysed. 8 Precision No definite statement on the pr
19、ecision and bias can be made at this time. These values shall be calculated using the results of a round-robin analysis. BS ISO 17352:200839 Test report The test report shall include the following information: a) a reference to this International Standard; b) all details necessary for identification
20、 of the test sample; c) the test results obtained; d) all operations not specified in this International Standard, or regarded as optional; e) details of any occurrence which may have affected the result. BS ISO 17352:20084 Bibliography 1 ISO 3252, Powder metallurgy Vocabulary 2 ASTM B 243, Standard
21、 Terminology of Powder Metallurgy BS ISO 17352:2008blankBS ISO 17352:2008BSI Group Headquarters389 Chiswick High Road,London W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 Standards Institute (BSI)BSI is the independent national body responsible for preparing British Standards. It presents the
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