Fine ceramics (advanced ceramics, advanced technical ceramics) -- Test method for determining thermal expansion coefficient and residual stress of CVD ceramic coatings

This document specifies a test method for determining thermal expansion coefficient up to 2 300 K and the residual stress of chemical vapour deposition (CVD) ceramic coatings (thickness > 0,03 mm) at room temperature. Procedures for test piece preparation, test modes, heat rate, data collection, property calculations and reporting procedures are given. This document applies to CVD ceramic coatings on metal or ceramic substrates. This test method can be used for material research, quality control, characterization and design data-generation purposes.

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Status
Published
Publication Date
11-May-2020
Technical Committee
Drafting Committee
Current Stage
6060 - International Standard published
Start Date
12-May-2020
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ISO 23458:2020 - Fine ceramics (advanced ceramics, advanced technical ceramics) -- Test method for determining thermal expansion coefficient and residual stress of CVD ceramic coatings
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INTERNATIONAL ISO
STANDARD 23458
First edition
2020-05
Fine ceramics (advanced ceramics,
advanced technical ceramics) — Test
method for determining thermal
expansion coefficient and residual
stress of CVD ceramic coatings
Reference number
ISO 23458:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 23458:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2020 – All rights reserved
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ISO 23458:2020(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 General ........................................................................................................................................................................................................... 2

5.2 Heating and cooling device........................................................................................................................................................... 3

5.3 Temperature measurement ......................................................................................................................................................... 3

5.4 Test piece mounting ........................................................................................................................................................................... 3

5.5 Data recording system ...................................................................................................................................................................... 4

5.6 Dimensional measuring devices .............................................................................................................................................. 4

6 Specimens .................................................................................................................................................................................................................... 4

6.1 Test piece ..................................................................................................................................................................................................... 4

6.2 Dimensions ................................................................................................................................................................................................. 5

6.3 Test piece preparation ...................................................................................................................................................................... 6

6.3.1 General...................................................................................................................................................................................... 6

6.3.2 Test piece handling and storage ......................................................................................................................... 6

6.3.3 Number of test pieces .................................................................................................................................................. 6

7 Test procedure ........................................................................................................................................................................................................ 6

7.1 Measurement of the test piece dimensions .................................................................................................................... 6

7.2 Measurement of the elastic modulus ................................................................................................................................... 6

7.3 Measurement of the thermal expansion coefficient of CVD coatings ...................................................... 6

7.4 Calculation of the residual stress in CVD coatings ................................................................................................... 7

8 Calculation .................................................................................................................................................................................................................. 7

8.1 Thermal expansion coefficient of the CVD ceramic coatings, α ................................................................. 7

8.2 Residual stress in CVD coatings, σ ...................................................................................................................................... 7

9 Test report ................................................................................................................................................................................................................... 8

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2020 – All rights reserved iii
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ISO 23458:2020(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.

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).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/

iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 206, Fine ceramics.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
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INTERNATIONAL STANDARD ISO 23458:2020(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Test method for determining thermal
expansion coefficient and residual stress of CVD ceramic
coatings
1 Scope

This document specifies a test method for determining thermal expansion coefficient up to 2 300 K

and the residual stress of chemical vapour deposition (CVD) ceramic coatings (thickness > 0,03 mm)

at room temperature. Procedures for test piece preparation, test modes, heat rate, data collection,

property calculations and reporting procedures are given.

This document applies to CVD ceramic coatings on metal or ceramic substrates. This test method can

be used for material research, quality control, characterization and design data-generation purposes.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 3611, Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for

external measurements — Design and metrological characteristics

ISO 17139, Fine ceramics (advanced ceramics, advanced technical ceramics) — Thermophysical properties

of ceramic composites — Determination of thermal expansion

ISO 19603, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for determining

elastic modulus and bending strength of thick ceramic coatings
IEC 60584-1, Thermocouples — Part 1: EMF specifications and tolerances
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
relative method
indirect test method to obtain the measured parameter

Note 1 to entry: The expected parameter A is usually difficult to measure directly, but parameters B and C are

known parameters or easy to obtain. If the analytical relationship of A = f (B, C) is established, the parameter A

can be calculated.
3.2
linear thermal expansion

positive or negative change in one dimension that occurs when a material is subjected to a change in

temperature
© ISO 2020 – All rights reserved 1
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ISO 23458:2020(E)
4 Principle

The deformation of a coated bar during heating or cooling involves two effect factors, i.e. thermal

expansion coefficient and residual stress in the coating and the substrate. The thermal expansion

coefficient is a material characteristic. However, the residual stresses in the coating are not only due to

a material property but depend also on the size of the component and the cross-sectional area ratio of

the coating and substrate.
The thermal
...

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