ISO 19674:2017 ファインセラミック（アドバンスドセラミック、アドバンストテクニカルセラミック）—セラミックコーティングの試験方法—ストーニー式の適用によるセラミックコーティングの内部応力の決定 | ページ 2

Foreword

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

Introduction

There is an increasing use of coatings to improve the functional performance of materials and components. This can be to protect against damage due to exposure to demanding environments including high stresses and aggressive chemical environments, but can also be to modify many other properties, e.g. thermal conductivity through thermal barrier coatings, friction through low friction coatings, such as diamond like carbon (DLC), and optical reflectivity through coatings with controlled optical properties.

Appropriate choice of coatings for particular applications depends on the mechanical and other functional requirements that arise. One factor that can be crucial in determining coating performance and lifetime is the residual stress that is generated by the deposition process and/or by thermal expansion mismatch between the coating and the substrate as the component is cooled from the processing temperature.

This document describes the application of a simple experimental technique using the Stoney formula to analyse the coating induced bending of coupons, of known mechanical properties, to determine the residual stress in the coating.

1 Scope

This document specifies a method for the determination of the internal stress in thin ceramic coatings by application of the Stoney formula to the results obtained from measurement of the radius of curvature of coated strips or discs.

2 Normative references

There are no normative references in this document.

3 Terms and definitions

No terms and definitions are listed in this document.

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

Bibliography