ISO 18591:2015

Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of compressive strength of ceramic granules

ISO 18591:2015 specifies the testing method to determine the compressive strength of ceramic granules, when subjected to uniaxial compressive loading in a confining die, under specified conditions.

Céramiques fines (céramiques avancées, céramiques techniques avancées) — Détermination de la force de compression des granules de céramique

General Information

• Status: Published
• Publication Date: 23-Nov-2015
• ICS: 81.060.30 - Advanced ceramics
• Technical Committee: ISO/TC 206 - Fine ceramics
• Drafting Committee: ISO/TC 206/WG 2 - Powders
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 09-Mar-2021

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 18591
First edition
2015-12-01
Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Determination of compressive
strength of ceramic granules
Céramiques fines (céramiques avancées, céramiques techniques
avancées) — Détermination de la force de compression des
granules de céramique
Reference number
ISO 18591:2015(E)
©
ISO 2015

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ISO 18591:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

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ISO 18591:2015(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Symbols and designation . 1
5 Apparatus . 1
6 Sampling . 2
7 Procedure. 2
7.1 Quantity . 2
7.2 Cleaning of the die and the punches . 2
7.3 Powder testing conditions . 2
7.4 Lubrication . 3
7.5 Compaction and ejection . 3
8 Expression of results . 4
8.1 Load-displacement curve. 4
8.2 Pressure-density curve . 4
8.3 Compressive strength of ceramic granules. 4
9 Test report . 4
Bibliography . 8
© ISO 2015 – All rights reserved iii

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ISO 18591:2015(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
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organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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Any trade name used in this document is information given for the convenience of users and does not
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For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.
The committee responsible for this document is ISO/TC 206, Fine ceramics.
iv © ISO 2015 – All rights reserved

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INTERNATIONAL STANDARD ISO 18591:2015(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Determination of compressive strength of
ceramic granules
1 Scope
This International Standard specifies the testing method to determine the compressive strength
of ceramic granules, when subjected to uniaxial compressive loading in a confining die, under
specified conditions.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
3 Principle
In general, a ceramic powder compact is made of ceramic granules. When ceramic granules are
compacted uniaxially in a confining die by pressing, first they are rearranged during compaction.
However, when a pressure higher than the critical pressure is applied to ceramic granules, the
deformation and the fracture of granulated powder also occur. The final density of powder compact
depends on the compressive strength (critical pressure) of ceramic granules. When ceramic granules
are pressed in a die by using a universal testing machine (UTM), a load-displacement (or load-strain)
curve can be obtained. Load-displacement curve can be converted into pressure-density curve by using
the dimensions and density of a powder compact ejected from the die. The compressive strength can be
determined from the slope change in the pressure-density curve.
4 Symbols and designation
Symbol Designation Unit
3
ρ Green density of powder compact g/cm
p
m Mass of powder compact g
3
V Volume of powder compact cm
2
A Area of powder compact cm
h Height of powder compact cm
l Displacement of powder compact cm
l Final displacement of powder compact cm
f
5 Apparatus
5.1 Cylindrical die, which shall be made from a hard material, preferably hardened steel or tungsten
...