NTERNATIONAL STANDARD (ISO) 4883 INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAA OPrAHW3ALWA nO CTAHAAPTM3ALWW+ORGANISATION INTE RNATIONALE DE NORMALISATION Hardmetals - Determination of contents of .metallic elements by X-ray fluorescence -- Solution method Metaux-durs - Dosage des élements metalliques par fluorescence de rayons X - Méthode par solution First edition - 1978-06-15 ISO 4883-1978 (E) UDC 621.762 : 661.665.2 : 546.3 : 543.422.8 Ref. No. 1SO 4883-1978 (E) niobium, tantalum, titanium, tungsten, vanadium, zirconium, spectrophotometric analysis, X-ray fluorescence spectrometry Price based on 2 pages Not for Resale FOREWORD Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (IsO member bodies). The work of developing International Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. tnternational organizations, governmental and non-governmental, in liaison with Iso, also take part in the work. Draft Internationat Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the iso Councit. International Standard 1sO 4883 was developed by Technical Committee ISO/TC 119, Powder metallurgical materials and products, and was circulated to the member bodies in December 1977. It has been approved by the member bodies of the following countries : Germany South Africa, Rep. of Australia Austria Ireland Spain Bulgaria Italy Sweden Canada Japan Turkey Chile Korea, Rep. of United Kingdom Czechoslovakia Mexico U.S.A Egypt, Arab Rep. of Poland U.S.S.R Romania France No member body expressed disapproval of the document. @ International Organization for Standardization, 1978 Printed in Switzerland Copyright International Organization for Standardization e from IHS INTERNATIONAL STANDARD ISO 4883-1978 (E) Hardmetals --- Determination of contents of metallic elements by X-ray fluorescence -- Solution method SCOPE 5 REAGENTS This International Standard specifies an X-ray fluorescence During the analysis, use only reagents of recognized ana- solution method for the determination of cobalt, iron, lytical grade, and only distilled water or water of equivatent manganese, molybdenum, nickel, niobium, tantalum, purity. titanium, tungsten, vanadium and zirconium contents of carbides and hardmetals. 5.1 Hydrofluoric acid, p 1,12 g/ml. 5.2 Nitric acid, p 1,42 g/ml. 2 FIELD OF APPLICATION The method is applicable to 5.3 Solvent solution. carbides of niobium, 'tantalum, titanium, vanadium, Mix 2 parts of the hydrofluoric acid (5.1), 1 part of the tungsten and zirconium, nitric acid (5.2) and 2 parts of distilled water. mixtures of these carbides and binder metals, 5.4 Tartaric acid solution, 200 g/l. all grades of presintered or sintered hardmetals, produced from these carbides, 6 APPARATUS with the minimum element contents shown in table 1. Ordinary laboratory apparatus and TABLE 1 Minimum 6.1 X-ray spectrometer, suitable for solution analysis. Element content % (m/m) 6.2 Sample cells, resistant to hydrofluoric-nitric acid Co 0,05 mixture, with a window consisting of 6 μm thick fim Fe 0,05 Mn 0,05 of polyethylene terephthalic acid ester. Mo 0,05 Nb 0,07 Ni 0,05 7 SAMPLING Ta 0,10 Ti 0,2 7.1 The sample shall be crushed in a mortar made of a V 0,05 material which does not alter the sample composition. W 0,10 The crushed material shall pass a 2 mm sieve. Zr 0,05 7.2 The analysis shali be carried out on two or three test portions. 3 PRINCIPLE Measurement of the intensity of the characteristic X-ray spectrum of the elements being determined. To eliminate 8 PROCEDURE the effects of particle size and inter-element effects, the 8.1 Weigh 2 ± 0,001 g of the test sample into a 150 ml test portion is dissolved in a mixture of hydrofluoric and po