ISO 14627:2012

Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for fracture resistance of silicon nitride materials for rolling bearing balls at room temperature by indentation fracture (IF) method

ISO 14627:2012 describes a test method that covers the determination of fracture resistance of silicon nitride bearing balls at room temperature by the indentation fracture (IF) method, as specified in ISO 26602. ISO 14627:2012 is intended for use with monolithic silicon nitride ceramics for bearing balls. It does not include other ceramic materials. ISO 14627:2012 is for material comparison and quality assurance.

Céramiques techniques — Méthode d'essai de résistance à la rupture des matériaux nitrure de silicium pour billes de roulement à billes à température ambiante par la méthode de rupture par indentation

General Information

• Status: Published
• Publication Date: 05-Jul-2012
• ICS: 81.060.30 - Advanced ceramics
• Technical Committee: ISO/TC 206 - Fine ceramics
• Drafting Committee: ISO/TC 206/WG 12 - Engineering applications
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 07-Mar-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 14627
First edition
2012-07-15
Fine ceramics (advanced ceramics,
advanced technical ceramics) — Test
method for fracture resistance of silicon
nitride materials for rolling bearing balls
at room temperature by indentation
fracture (IF) method
Céramiques techniques — Méthode d’essai de résistance à la rupture
des matériaux nitrure de silicium pour billes de roulement à billes à
température ambiante par la méthode de rupture par indentation
Reference number
ISO 14627:2012(E)
©
ISO 2012

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ISO 14627:2012(E)
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© ISO 2012
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ii © ISO 2012 – All rights reserved

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ISO 14627:2012(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Testing machine . 2
5.2 Indenter . 2
5.3 Verification by standard reference materials . 3
6 Test specimens . 3
6.1 General . 3
6.2 Thickness . 3
6.3 Surface finish . 3
7 Procedure . 3
7.1 Specimen placement . 3
7.2 Specimen leveling . 3
7.3 Clean the indenter . 3
7.4 Application of test load . 3
7.5 Acceptability of indentations . 4
7.6 Number of indentations . 4
7.7 Measurement of indentation size . 5
7.8 Measurement of crack size . 5
8 Calculation . 5
9 Test report . 6
Bibliography . 8
© ISO 2012 – All rights reserved iii

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ISO 14627:2012(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 14627 was prepared by Technical Committee ISO/TC 206, Fine ceramics.
iv © ISO 2012 – All rights reserved

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INTERNATIONAL STANDARD ISO 14627:2012(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Test method for fracture resistance of silicon
nitride materials for rolling bearing balls at room temperature
by indentation fracture (IF) method
1 Scope
This International Standard describes a test method that covers the determination of fracture resistance of silicon
nitride bearing balls at room temperature by the indentation fracture (IF) method, as specified in ISO 26602.
This International Standard is intended for use with monolithic silicon nitride ceramics for bearing balls. It does
not include other ceramic materials.
This International Standard is for material comparison and quality assurance.
Indentation fracture resistance, K as defined in this International Standard is not to be equated to fracture
I, IFR
toughness determined using other test methods such as K and K .
Isc Ipb
NOTE K is an estimate of a material’s resistance to cracking as introduced by an indenter and has correlations with
I, IFR
wear resistance and rolling contact fatigue performance as well as machining processes used for silicon nitride materials
since these properties are governed by the resistance to crack extension in localized damage areas. By contrast, fracture
toughness, K and K are intrinsic properties of a material and are relevant to macroscopic and catastrophic fracture
Isc Ipb
events with long cracks, rather than those phenomena caused by microscopic and successive damage accumulation
associated with short cracks.
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 4287:1997, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms,
definitions and surface texture parameters
ISO 6507-2:2005, Metallic materials — Vickers hardness test — Part 2: Verification and calibration of
testing machines
ISO 6507-3:2005, Metallic materials — Vickers hardness test — Part 3: Calibration of reference blocks
ISO/IEC 17025:2005, General requirements for the competence of testing and calibration laboratories
ISO 17561:2002, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for elastic
moduli of monolithic ceramics at room temperature by sonic resonance
ISO 26602:2009, Fine ceramics (advanced ceramics, advanced technical ceramics) — Silicon nitride materials
for rolling bearing balls
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
© ISO 2012 – All rights reserved 1

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ISO 14627:2012(E)
3.1
fracture resistance
K
I, IFR
fracture resistance measured by the IF method
[ISO 26602:2009]
NOTE The indentation fracture resistance, K , as used here is not to be equated to fast fracture toughness K .
I, IFR Ic
K is an estimate of a material’s resistance to cracking as introduced by an indenter. K is considered to be an intrinsic
I, IFR Ic
property of a material and is independent of the test method.
3.2
preprocessed ball
densified unit of material from a material lot before final shaping and finishing
[ISO 26602:2009]
4 Principle
This International Standard is for material comparison, quality assurance of silicon nitride materials for rolling
bearing balls as described in ISO 26602. The method determines the indentation fracture resistance value, K
I,
, by forcing a Vickers indenter (diamond pyramid) into the surface of a test piece and measuring the lengths
IFR
of both the diagonals and the associated cracks of the indentation that are left in the surface after removal of
the indenter. See Figure 1.
...