ISO 15379-2:2015

Name: ISO 15379-2:2015 — Carbonaceous materials for the production of aluminium — Cathode block materials — Part 2: Determination of the expansion due to sodium penetration without application of pressure
SKU: ISO 15379-2:2015
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Carbonaceous materials for the production of aluminium — Cathode block materials — Part 2: Determination of the expansion due to sodium penetration without application of pressure

Название (английский):

ISO 15379-2:2015

Carbonaceous materials for the production of aluminium — Cathode block materials — Part 2: Determination of the expansion due to sodium penetration without application of pressure

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 22 мая 2015 г.
Издание:: ISO IS 15379 edition 2 version 1
ICS:: 71.100.10

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Описание (английский):

ISO 15379-2:2015 specifies a method that covers the determination of linear expansion under external pressure due to sodium penetration in cathode-block materials used in the production of aluminium. The linear expansion of the blocks depends on the sampling direction due to anisotropy.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 15379-2:2015 defines a laboratory test method for measuring linear expansion of cathode block materials due to sodium penetration without applied pressure. The standard is aimed at carbonaceous materials used in aluminium production and specifies a controlled electrolysis test in a cryolitic bath to quantify sodium-induced swelling (sodium penetration / sodium-induced expansion). Results help assess material performance and predict risks like block bulging, cracking, and cell relining.

Key topics and technical requirements

Scope and purpose: Determines maximum relative linear expansion (%) caused by sodium penetration when no external pressure is applied. Notes that expansion is anisotropic and depends on sampling direction.

Sample geometry and sampling: Sample diameter (30.0 ± 0.1) mm, length 100 mm; central drilled hole 6 mm ∅ threaded to (25 ± 5) mm; sampling per ISO 8007-1 and orientation must be reported.

Test bath and temperature: Cryolitic bath with a cryolite ratio of 4.0 (composition detailed in the standard), total bath mass 765 g; furnace maintained at (980 ± 5) °C with <10 °C gradient over melt.

Electrical and electrolysis conditions: DC current (54 ± 1) A producing a cathode current density ≈ 0.7 A/cm2; electrolysis duration 2 h.

Apparatus and measurement: Graphite crucible (inner Ø 90 mm), copper sample holder, Inconel rod placed inside sample hole, extensometer (10 mm range, 1 µm accuracy) records Δl(t) every minute. Thermocouple (type K or S) calibrated per ASTM E 220.

Calculations and precision: Relative expansion ΔL(t) = [Δl(t) / l0] × 100; maximum relative expansion ΔLmax reported to two decimal places. Precision (repeatability and reproducibility) determined per ISO 5725-2 with formulas provided (example calculation included in the standard).

Reporting requirements: Include reference to ISO 15379-2, sample ID and orientation, ΔLmax, plot of ΔL(t) vs time, test date and notable observations.

Applications and users

Aluminium smelters and process engineers: Evaluate cathode block performance to prevent swelling-related failures, reduce risk of electrolyte leakage and costly relines.

Material producers and QA labs: Quality control of carbonaceous cathode materials and batch acceptance testing.

R&D and material characterization: Compare formulations, additives or processing effects on sodium penetration and anisotropic expansion.

Third‑party testing laboratories: Provide validated measurement data for suppliers and end users.

Related standards

ISO 15379-1 (with application of pressure)

ISO 8007-1 (sampling from cathode blocks)

ISO 5725-2 (precision of measurement methods)

ISO 11713 (electrical resistivity measurements - complementary test)

Keywords: ISO 15379-2, cathode block materials, carbonaceous materials, sodium penetration, linear expansion test, aluminium production, cryolite bath, electrolysis test, cathode swelling, sample anisotropy.

ISO 15379-2:2015

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 8007-1:1999

Carbonaceous materials used in the production of aluminium — Sampling plans and sampling from individual unit…

ISO 5725-2:1994

Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method for the determina…

BS ISO 15379-2:2015

Carbonaceous materials for the production of aluminium. Cathode block materials. Determination of the expansi…

BS ISO 15379-1:2019

Carbonaceous materials for the production of aluminium. Cathode block materials. Determination of the expansi…

BS ISO 11713:2025

Carbonaceous materials used in the production of aluminium. Cathode blocks and baked anodes. Determination of…