Metallic and other inorganic coatings — Measurement of the linear thermal expansion coefficient of thermal barrier coatings

This document specifies a method for measuring the reproducible linear thermal expansion coefficient of ceramic top coats (TCs) for thermal barrier coatings (TBCs) up to 1 300 °C.

Revêtements métalliques et autres revêtements inorganiques — Mesure du coefficient de dilatation thermique linéaire des revêtements barrières thermiques

General Information

Status
Published
Publication Date
26-May-2020
Current Stage
6060 - International Standard published
Start Date
25-Apr-2020
Completion Date
27-May-2020
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INTERNATIONAL ISO
STANDARD 22680
First edition
2020-05
Metallic and other inorganic
coatings — Measurement of the linear
thermal expansion coefficient of
thermal barrier coatings
Revêtements métalliques et autres revêtements inorganiques —
Mesure du coefficient de dilatation thermique linéaire des
revêtements barrières thermiques
Reference number
ISO 22680:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 22680:2020(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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22680:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 2

5 Apparatus for measuring the linear thermal expansion coefficient ..............................................................3

5.1 Apparatus .................................................................................................................................................................................................... 3

5.2 Supporting jig ........................................................................................................................................................................................... 4

6 Specimen ....................................................................................................................................................................................................................... 4

6.1 Test specimen ........................................................................................................................................................................................... 4

6.2 Reference specimen ............................................................................................................................................................................ 5

7 Measuring procedure ...................................................................................................................................................................................... 5

8 Test report ................................................................................................................................................................................................................... 5

Annex A (informative) An example of the measurement of the linear thermal expansion

coefficient of a TC ................................................................................................................................................................................................. 7

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

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 22680:2020(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 107, Metallic and other inorganic coatings.

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
---------------------- Page: 4 ----------------------
ISO 22680:2020(E)
Introduction

Thermal barrier coatings are highly advanced material systems, generally applied to surfaces of hot-

section components made of nickel or cobalt-based superalloys, such as combustors, blades and vanes

of power-generation gas turbines in thermal power plants and aero-engines operated at elevated

temperatures.

The function of these coatings is to protect metallic components for extended periods at elevated

temperatures by employing thermally insulating materials that can sustain an appreciable temperature

difference between load bearing alloys and coating surfaces. These coatings permit the high-

temperature operation by shielding these components, thereby extending their lives.

Although the linear thermal expansion coefficient is an important property of thermal barrier coatings,

the existing International Standard (e.g. ISO 17562) describes only a method for measuring this

parameter for monolithic ceramics.

This document specifies a method for measuring the linear thermal expansion coefficient of the ceramic

top coat for thermal barrier coating.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 22680:2020(E)
Metallic and other inorganic coatings — Measurement of
the linear thermal expansion coefficient of thermal barrier
coatings
1 Scope

This document specifies a method for measuring the reproducible linear thermal expansion coefficient

of ceramic top coats (TCs) for thermal barrier coatings (TBCs) up to 1 300 °C.
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 17562, Fine ceramics (advanced cer
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 22680
ISO/TC 107
Metallic and other inorganic
Secretariat: KATS
coatings — Measurement of the linear
Voting begins on:
2020­02­28 thermal expansion coefficient of
thermal barrier coatings
Voting terminates on:
2020­04­24
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 22680:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 22680:2020(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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH­1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 22680:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 2

5 Apparatus for measuring the linear thermal expansion coefficient ..............................................................3

5.1 Apparatus .................................................................................................................................................................................................... 3

5.2 Supporting jig ........................................................................................................................................................................................... 4

6 Specimen ....................................................................................................................................................................................................................... 4

6.1 Test specimen ........................................................................................................................................................................................... 4

6.2 Reference specimen ............................................................................................................................................................................ 4

7 Measuring procedure ...................................................................................................................................................................................... 5

8 Test report ................................................................................................................................................................................................................... 5

Annex A (informative) An example of the measurement of the linear thermal expansion

coefficient of a TC ................................................................................................................................................................................................. 7

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

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 22680:2020(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 non­governmental, 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 107, Metallic and other inorganic coatings.

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
---------------------- Page: 4 ----------------------
ISO/FDIS 22680:2020(E)
Introduction

Thermal barrier coatings are highly advanced material systems, generally applied to surfaces of hot-

section components made of nickel or cobalt-based superalloys, such as combustors, blades and vanes

of power­generation gas turbines in thermal power plants and aero­engines operated at elevated

temperatures.

The function of these coatings is to protect metallic components for extended periods at elevated

temperatures by employing thermally insulating materials that can sustain an appreciable temperature

difference between load bearing alloys and coating surfaces. These coatings permit the high-

temperature operation by shielding these components, thereby extending their lives.

Although the linear thermal expansion coefficient is an important property of thermal barrier coatings,

the existing International Standard (e.g. ISO 17562) describes only a method for measuring this

parameter for monolithic ceramics.

This document specifies a method for measuring the linear thermal expansion coefficient of the ceramic

top coat for thermal barrier coating.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 22680:2020(E)
Metallic and other inorganic coatings — Measurement of
the linear thermal expansion coefficient of thermal barrier
coatings
1 Scope

This document specifies a method for measuring the reproducible linear thermal expansion coefficient

of ceramic top coats (TCs) for thermal barrier coatings (TBCs) up to 1 300 °C.
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 m
...

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