EN 3976:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Titan und Titanlegierungen - Prüfverfahren - Chemische Analyse zur Bestimmung des WasserstoffgehaltesSérie aérospatiale - Titane et alliages de titane - Méthode d'essai - Analyse chimique pour détermination de la teneur en hydrogèneAerospace series - Titanium and titanium alloys - Test method - Chemical analysis for the determination of hydrogen content49.025.30TitanTitaniumICS:Ta slovenski standard je istoveten z:EN 3976:2006SIST EN 3976:2009en,de01-junij-2009SIST EN 3976:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3976December 2006ICS 49.025.30 English VersionAerospace series - Titanium and titanium alloys - Test method -Chemical analysis for the determination of hydrogen contentSérie aérospatiale - Titane et alliages de titane - Méthoded'essai - Analyse chimique pour détermination de la teneuren hydrogèneLuft- und Raumfahrt - Titan und Titanlegierungen -Versuchsmethode - Chemische Analyse zur Bestimmungdes WasserstoffanteilsThis European Standard was approved by CEN on 18 October 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 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 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 bodies 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 COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3976:2006: ESIST EN 3976:2009

Solid State Hot Extraction under Vacuum Method.11
1) Published as ASD Prestandard at the date of publication of this standard. SIST EN 3976:2009

5.2 Method 1 The role of melting flux is to liquefy the mixture (thus facilitating the gas extraction) and to avoid an eventual formation of nitrides. Fusion is performed in a graphite crucible at a temperature of around 1 800 °C:  either in a nitrogen supporting gas which allows the nitrogen in the sample to be disregarded with the carbon monoxide which, with the nitrogen, has a very small difference in conductivity. (The excess of carbon and the temperature at which melting is performed prevents any carbon dioxide from forming; it is necessary, however, to foresee a way of trapping small quantities of this gas eventually present by using, for example, a molecular sieve);  or in an argon supporting gas which prevents nitrides forming and results in a better sensitivity since argon has a greater difference in conductivity compared to hydrogen. A separation of nitrogen and carbon oxides is necessary as well as, in the case of using a high frequency furnace, an adapted frequency to avoid discharges by ionization. SIST EN 3976:2009

ρ 20 = 1,38 g/ml  Hydrofluoric acid
Aqueous solution at 40 %, ρ 20 = 1,13 g/ml  95 % or 96 % (v/v) ethanol  Melting flux tin granules  Absorbing reagents, separating columns as specified by the manufacturer of the equipment  Carbon tetrachloride  Diethyl oxide  Acetone SIST EN 3976:2009
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