ISO 14420:2005

Carbonaceous products for the production of aluminium — Baked anodes and shaped carbon products — Determination of the coefficient of linear thermal expansion

ISO 14420:2005 specifies a method to determine the coefficient of linear thermal expansion of carbonaceous or graphite materials (solid materials) for the production of aluminium between 20 °C and 300 °C. It applies to baked anodes and shaped carbon products.

Produits carbonés utilisés pour la production de l'aluminium — Anodes cuites et produits carbonés formés — Détermination du coefficient de dilatation thermique

General Information

• Status: Withdrawn
• Publication Date: 05-Jul-2005
• Withdrawal Date: 05-Jul-2005
• ICS: 71.100.10 - Materials for aluminium production
• Technical Committee: ISO/TC 226 - Materials for the production of primary aluminium
• Drafting Committee: ISO/TC 226 - Materials for the production of primary aluminium
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 05-Mar-2020

Relations

• Revised: ISO 14420:2020 - Carbonaceous products for the production of aluminium — Baked anodes and shaped carbon products — Determination of the coefficient of linear thermal expansion
• Effective Date: 04-Nov-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 14420
First edition
2005-07-01

Carbonaceous products for the
production of aluminium — Baked
anodes and shaped carbon products —
Determination of the coefficient of linear
thermal expansion
Produits carbonés utilisés pour la production de l'aluminium — Anodes
cuites et produits carbonés formés — Détermination du coefficient de
dilatation thermique




Reference number
ISO 14420:2005(E)
©
ISO 2005

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ISO 14420:2005(E)
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ii © ISO 2005 – All rights reserved

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ISO 14420:2005(E)
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. 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
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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 International 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 elements 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 14420 was prepared by Technical Committee ISO/TC 226, Materials for the production of primary
aluminium.
© ISO 2005 – All rights reserved iii

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ISO 14420:2005(E)
Introduction
This International Standard is based on DIN 51909:1984 prepared by the committee NMP 281 “Prüfverfahren
für Kohlenstoff und Graphit” in DIN Deutsches Institut für Normung e.V., Berlin.

iv © ISO 2005 – All rights reserved

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INTERNATIONAL STANDARD ISO 14420:2005(E)

Carbonaceous products for the production of aluminium —
Baked anodes and shaped carbon products — Determination of
the coefficient of linear thermal expansion
1 Scope
This International Standard specifies a method to determine the coefficient of linear thermal expansion of
carbonaceous or graphite materials (solid materials) for the production of aluminium between 20 °C and
300 °C. It applies to baked anodes and shaped carbon products.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 6906, Vernier callipers reading to 0,02 mm
ISO 3611, Micrometer callipers for external measurement
DIN 1333, Presentation of numerical data
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
linear thermal expansion coefficient
thermal expansion coefficient α(ϑ) correlated with the length change of a body with temperature
NOTE The linear thermal expansion coefficient is calculated from the following formula.
1dl
aϑ=⋅ (1)
()
l dϑ
where
α(ϑ) is the linear expansion coefficient;
l is the length of the test specimen at temperature ϑ;
dl
is the length change with temperature.
dϑ
© ISO 2005 – All rights reserved 1

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ISO 14420:2005(E)
3.2
average linear thermal expansion coefficient
average linear expansion coefficient α(ϑ ,ϑ ) correlated with the length change of a body with temperature

1 2
NOTE The average linear expansion coefficient is calculated from the following formula
11ll− ∆l
21
αϑ ;ϑ =⋅ =⋅ (2)
()
12
llϑ−∆ϑϑ
1 211
∆=ϑϑϑ− (3)
21
∆=ll −l (4)
21
where
ϑ is the lower limit of the temperature interval, in °C;
1
ϑ is the upper limit of the temperature interval, in °C;
2
l is the length of the test specimen, in mm, at temperature ϑ ;
1 1
l is the length of the test specimen at temperature ϑ ;
2 2
α is the mean linear thermal expansion coefficient, in units of 1/K, of the sample holder and the
push-rod for the temperature range under consideration.
4 Principle
The average linear thermal expansion coefficient is determined by means of a push-rod dilatometer. The test
specimen is contained in a sample holder made from low-expansivity material (such as flint glass). It is heated
in a furnace and the length change is transmitted to a mechanical, optical, or electronic measuring system
outside the furnace by a push-rod.
The average linear thermal expansion coefficient is calculated from the measured length change, the original
length, and the temperature change of the test specimen, taking the expansion of the sample holder and the
push-rod into account. Unless otherwise stated, the determination is performed between a lower limit for the
temperature interval of 20 °C (i.e. room temperature) and an upper limit for the temperature interval of 300 °C
max.
5 Apparatus
5.1 Dilatometer, with sample holder and push-rod, for example, made from flint glass, as well as a
mechanical, optical or electronic length-measurement device (error limits ± 0,5 µm), for tempera
...