ISO 24235:2007

Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of particle size distribution of ceramic powders by laser diffraction method

ISO 24235:2007 specifies a laser diffraction method for measuring particle size distributions, by means of the detection of angular distributions of the intensity of light scattered by fine-ceramic raw powders dispersed in a liquid phase irradiated by a laser beam.

Céramiques techniques — Détermination de la répartition granulométrique des poudres céramiques au moyen d'une méthode par diffraction laser

General Information

• Status: Published
• Publication Date: 29-Mar-2007
• 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: 14-Mar-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 24235
First edition
2007-04-01

Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Determination of particle size distribution
of ceramic powders by laser diffraction
method
Céramiques techniques — Détermination de la répartition
granulométrique des poudres céramiques au moyen d'une méthode par
diffraction laser




Reference number
ISO 24235:2007(E)
©
ISO 2007

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ISO 24235:2007(E)
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ii © ISO 2007 – All rights reserved

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ISO 24235:2007(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 1
4 Principle of measurement. 2
5 Equipment. 2
6 Dispersion medium. 4
7 Sample preparation. 4
8 Measuring procedure. 4
9 Report of result . 5

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ISO 24235:2007(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
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.
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 24235 was prepared by Technical Committee ISO/TC 206, Fine ceramics.

iv © ISO 2007 – All rights reserved

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INTERNATIONAL STANDARD ISO 24235:2007(E)

Fine ceramics (advanced ceramics, advanced technical
ceramics) — Determination of particle size distribution
of ceramic powders by laser diffraction method
1 Scope
This International Standard specifies a laser diffraction method for measuring particle size distributions, by
means of the detection of angular distributions of the intensity of light scattered by fine-ceramic raw powders
dispersed in a liquid phase irradiated by a laser beam. A typical size range is 0,1 µm to 50 µm.
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 3082:2000, Iron ores — Sampling and sample preparation procedures
ISO 13320-1:1999, Particle size analysis — Laser diffraction methods — Part 1: General principles
ISO 14703:2000, Fine ceramics (advanced ceramics, advanced technical ceramics) — Sample preparation for
the determination of particle size distribution of ceramic powders
ISO 14887:2000, Sample preparation — Dispersing procedures for powders in liquids.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13320-1 apply, together with the
following.
3.1
angular distribution of intensity of light scattered
intensity of light scattered as a function of scattering angle
3.2
scattering angle
angle between the directions of the transmitted laser beam and the scattered light detected
3.3
relative refractive index
ratio of the absolute refractive index of the sample to the real part of the dispersion medium
© ISO 2007 – All rights reserved 1

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ISO 24235:2007(E)
4 Principle of measurement
A particle illuminated by a collimated light beam of a known wavelength from a laser presents a scattering
signature that is a function of the size, shape and relative refractive index of the particle. When particles
dispersed in a liquid are irradiated by a laser beam, the scattering signature is supposed to be the summation
of the signatures of each particle. In the basic optical system shown in Figure 1, the light scattered by the
particles in the laser beam is collected by a Fourier lens on the detector placed on the focal plane of the lens,
to detect the angular distribution of the scattered intensity. The size distribution of the particles is
mathematically reduced from the measured an
...