ISO 13093:2023
(Main)Titanium and titanium alloys — Determination of carbon — Infrared absorption method after combustion in an induction furnace
Titanium and titanium alloys — Determination of carbon — Infrared absorption method after combustion in an induction furnace
This document specifies an infrared absorption method after combustion in an induction furnace under oxygen atmosphere for the determination of carbon in titanium and titanium alloys. The method is applicable to carbon contents between 0,003 % (mass fraction) and 0,050 % (mass fraction).
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General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 13093
First edition
2023-09
Titanium and titanium alloys —
Determination of carbon — Infrared
absorption method after combustion
in an induction furnace
Reference number
ISO 13093:2023(E)
© ISO 2023
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ISO 13093:2023(E)
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© ISO 2023
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ISO 13093:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Sampling and sample preparation . 2
8 Procedure .2
8.1 Test portion . 2
8.2 Number of determination . 2
8.3 Preparation of the instrument . 2
8.4 Blank tests . 3
8.5 Calibration . 3
8.6 Determination . 4
8.7 Calculation . 5
9 Precision . 5
10 Test report . 6
Annex A (informative) Composition of the samples used for the validation precision test .7
Annex B (informative) Graphical representation of the precision data. 8
Bibliography . 9
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ISO 13093:2023(E)
Foreword
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This document was prepared by Technical Committee ISO/TC 79, Light metals and their alloys,
Subcommittee SC 11, Titanium.
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INTERNATIONAL STANDARD ISO 13093:2023(E)
Titanium and titanium alloys — Determination of carbon
— Infrared absorption method after combustion in an
induction furnace
1 Scope
This document specifies an infrared absorption method after combustion in an induction furnace under
oxygen atmosphere for the determination of carbon in titanium and titanium alloys.
The method is applicable to carbon contents between 0,003 % (mass fraction) and 0,050 % (mass
fraction).
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
A test portion is combusted in presence of an accelerator at a high temperature in a high-frequency
induction furnace in a current of pure oxygen.
Carbon is transformed into carbon dioxide and/or carbon monoxide. Measurement is by infrared
absorption of the carbon dioxide and/or carbon monoxide carried by a current of oxygen.
5 Reagents
During analysis, unless otherwise stated, use only reagents of recognized analytical grade.
5.1 Magnesium perchlorate, Mg (ClO ) (commercial name: anhydrone), used to absorb moisture.
4 2
Use purity specified by the manufacturer of the instrument.
5.2 Inert ceramic (attapulgus clay) or silica impregnated with sodium hydroxide or potassium
hydroxide, used to absorb carbon dioxide. Use purity specified by the manufacturer of the instrument.
5.3 Accelerator, of tungsten, iron or tin with a particle size above 0,15 mm. Use purity specified by
the manufacturer of the equipment.
5.4 Oxygen, with high purity as specified by the manufacturer of the equipment. An oxidation
catalyst[copper(ll) oxide or platinum] tube heated to a temperature above 600 °C followed by suitable
carbon dioxide and water absorbents shall be used when the presence of organic contaminants is
suspected in the oxygen.
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ISO 13093:2023(E)
5.5 Ethanol or acetone, used to clean the sample from organic contamination. Use purity and type
specified by the manufacturer of the instrument.
5.6 Titanium or titanium alloys certified reference materials (CRMs) or reference materials
(RMs). Select only titanium or titanium alloy CRMs or RMs. Select CRMs or RMs covering the top, the
middle and the bottom of the scope. The accuracy of the present method is largely dependent on the
carbon values assigned to the CRMs or RMs and on the homogeneity of these materials.
6 Apparatus
The apparatus required for combustion is a high-frequency induction furnace and an infrared
absorption device for the measurement of the evolved carbon dioxide and/or carbon monoxide. These
instruments can be obtained commercially from a number of manufacturers.
6.1 Ceramic crucible, high purity crucibles recommended by the manufacturer of the instrument
used and capable of withstanding combustion in an induction furnace without evolving carbon-
containing chemicals. Ignite the crucibles in an electric furnace at more than 900 °C for at least 1 h.
After this treatment, remove the crucibles from the fu
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