EN 23908:1993

SLOVENSKI STANDARD
01-december-2000
Hardmetals - Determination of insoluble (free) carbon content - Gravimetric
method (ISO 3908:1985)
Hardmetals - Determination of insoluble (free) carbon content - Gravimetric method (ISO
3908:1985)
Hartmetalle - Bestimmung des unlöslichen (freien) Kohlenstoff-Gehaltes -
Gravimetrisches Verfahren (ISO 3908:1985)
Métaux-durs - Détermination du carbone insoluble (libre) - Méthode gravimétrique (ISO
3908:1985)
Ta slovenski standard je istoveten z: EN 23908:1993
ICS:
77.160 Metalurgija prahov Powder metallurgy
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

International Standard 3908
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*MEXflYHAPOfiHAR OPTAHM3ALlMR I-IO CTAH~APTM3ALlMM@ORGANISATION INTERNATIONALE DE NORMALISATION
Determination of insoluble (free) carbon
Hardmetals -
content - Gravimetric method
Mbtaux-durs - Dosage du carbone insoluble (libre) - Mbthode gravimetrique
Second edition - 1985-02-15
Ref. No. ISO 3908-1985 (E)
UDC 621.762 : 546.26 : 543.21
determination of content, carbon, gravimetric
hardmetals, Chemical analysis,
Descriptors : powder metallurgy, carbides, sintered products,
analysis.
Price based on 2 pages
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 carried out through ISO technical committees. Esch 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
International Standard ISO 3908 was prepared by Technical Committee ISO/TC 119,
Powder metallurgy.
ISO 3908 was first published in 1976. This second edition cancels and replaces the first
edition, of which it constitutes a technical revision.
0 International Organkation for Standardization, 1985
Printed in Switzerland
ISO 3908-1985 (El
INTERNATIONAL STANDARD
Hardmetals - Determination of insoluble (free) carbon
content - Gravimetric method
6.1 Apparatus specified in ISO 3907.
1 Scope
This International Standard specifies a gravimetric method for
6.2 Platinum dish, of capacity 200 ml.
determination of the insoluble (free) carbon content of carbides
and hardmetals.
6.3 Filter device : ceramic filter device or bed of suitable
refractory fibrous or powder material in a Gooch crucible.
2 Field of application
NOTE - If necessary, pretreat the refractory material at 800 to
This method is applicable to
1 000 OC under strongly oxidizing conditions for a minimum of 3 h.
Store it in a desiccator, if pretreated.
-
carbides of hafnium, molybdenum, niobium, tantalum,
titanium, vanadium, tungsten and zirconium,
6.4 Vacuum filtration assembly.
-
mixtures of these carbides and binder metals, free of
lubricant,
7 Sampling
-
all grades of presintered or sintered hardmetals, pro-
duced from these carbides,
7.1 The Sample shall be crushed to a powder in a mortar
made of a material which does not alter the Sample composi-
having an insolub
...