ISO 26602:2009

INTERNATIONAL ISO
STANDARD 26602
First edition
2009-02-01


Fine ceramics (advanced ceramics,
advanced technical ceramics) — Silicon
nitride materials for rolling bearing balls
Céramiques techniques — Matériaux en nitrure de silicium pour billes
utilisées dans les roulements à billes





Reference number
ISO 26602:2009(E)
©
ISO 2009

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ISO 26602:2009(E)
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ii © ISO 2009 – All rights reserved

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ISO 26602:2009(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Physical and mechanical properties .2
5 Material classification .2
6 Test .3
6.1 Density.3
6.2 Elastic modulus .3
6.3 Poisson’s ratio.3
6.4 Coefficient of thermal expansion.3
6.5 Flexural strength and Weibull modulus.3
6.6 Hardness .3
6.7 Indentation fracture resistance.3
6.8 Microstructure .4
7 Classification of materials.4
8 Test report.4
Annex A (normative) Microstructure observation procedure .5
Annex B (normative) Material classification for silicon nitride materials.6
Bibliography.7

© ISO 2009 – All rights reserved iii

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ISO 26602:2009(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 26602 was prepared by Technical Committee ISO/TC 206, Fine ceramics.

iv © ISO 2009 – All rights reserved

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INTERNATIONAL STANDARD ISO 26602:2009(E)

Fine ceramics (advanced ceramics, advanced technical
ceramics) — Silicon nitride materials for rolling bearing balls
1 Scope
This International Standard specifies the requirements for preprocessed silicon nitride materials for rolling
bearing balls.
This International Standard provides a classification defining physical and mechanical properties of silicon
nitride preprocessed bearing ball materials. The materials are classified in three categories by the
specification of characteristics and microstructures. Methods for sample preparation and observation of
microstructures are provided in Annex A.
NOTE The silicon nitride product means the sintered body of which the main component is silicon nitride material.
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 14704, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for flexural
strength of monolithic ceramics at room temperature
ISO 14705, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for hardness of
monolithic ceramics at room temperature
ISO 15732, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for fracture
toughness of monolithic ceramics at room temperature by single edge precracked beam (SEPB) method
ISO 17561, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for elastic
moduli of monolithic ceramics at room temperature by sonic resonance
ISO 17562, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for linear
thermal expansion of monolithic ceramics by push-rod technique
ISO 18754, Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of density
and apparent porosity
ISO 20501, Fine ceramics (advanced ceramics, advanced technical ceramics) — Weibull statistics for
strength data
ISO 20507, Fine ceramics (advanced ceramics, advanced technical ceramics) — Vocabulary
ASTM F2094, Standard Specification for Silicon Nitride Bearing Balls
© ISO 2009 – All rights reserved 1

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ISO 26602:2009(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20507 and the following apply.
3.1
fracture resistance
K
I, IFR
fracture resistance measured in accordance with the indentation fracture (IF) method specified in
ASTM F2094, Annex
3.2
mater
...